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[ "the metal on the roof of a car is exposed to air & if something is exposed to air, then that something is in contact with air -> the metal on the roof of a car is in contact with air", " the metal on the roof of a car is in contact with air & air contains oxygen and water vapor -> the metal on the roof of a car is in contact with oxygen and water vapor", " the metal on the roof of a car is in contact with oxygen and water vapor & metal in contact with water and oxygen will rust -> the metal on the roof of a car rusts", " " ]

[ "oxygen is a kind of element & hydrogen is a kind of element -> hydrogen and oxygen are two elements", " hydrogen and oxygen are two elements & water is made of hydrogen and oxygen chemically combined -> water is made of two elements", " water is made of two elements & a compound is made of two or more elements chemically combined -> water is a kind of compound", " " ]

[ "when two substances together form a compound then those substances cannot be physically separated & the new substance cannot be physically separated -> the new substance is a compound", " " ]

[ "a new substance glycogen is produced in the conversion & chemical reactions cause new substances to form -> a chemical reaction causes the new substance glycogen to form in the conversion", " " ]

[ "batter and cake are different substances & baking a cake turns batter into a cake -> baking a cake produces a different substance", " burning a match will produce ashes & lighting a match causes that match to burn -> lighting a match causes the match to produce ashes", " lighting a match causes the match to produce ashes & match and ashes are different substances -> lighting a match produces a different substance", " baking a cake produces a different substance & lighting a match produces a different substance -> baking a cake and lighting a match both produces different substances", " baking a cake and lighting a match both produces different substances & chemical reactions cause different substances to form -> lighting a match and baking a cake are both chemical reactions", " lighting a match and baking a cake are both chemical reactions & chemical reactions cause chemical change -> lighting a match and baking a cake are both chemical changes", " " ]

[ "iron is a kind of metal & nails are often made of iron -> nails are made of metal", " nails are made of metal & metals in contact with water and oxygen will rust -> nails in contact with water and oxygen will rust", " nails in contact with water and oxygen will rust & rust forming is a kind of chemical change -> nails rusting in water is a kind of chemical change", " " ]

[ "fire is a kind of chemical reaction & fire causes burning -> burning something with fire is a kind of chemical reaction", " burning something with fire is a kind of chemical reaction & a lit candle is a source of fire -> burning something with a lit candle is a kind of chemical reaction", " burning something with a lit candle is a kind of chemical reaction & magnesium is a kind of substance -> burning magnesium with a lit candle is a kind of chemical reaction", " burning magnesium with a lit candle is a kind of chemical reaction & chemical reactions cause chemical change -> burning magnesium with a lit candle will lead to a chemical change", " " ]

[ "sodium is a kind of element & chlorine is a kind of element -> sodium and chlorine are two elements", " sodium and chlorine are two elements & sodium chloride is always made of chemically combined chlorine and sodium -> sodium chloride is made of two elements chemically combined", " sodium chloride is made of two elements chemically combined & a compound is made of two or more elements chemically combined -> sodium chloride is a kind of chemical compound", " " ]

[ "wood burns & wood chips are made of wood -> wood chips burn", " wood chips burn & fire causes burning -> fire causes wood chips to burn", " fire causes wood chips to burn & fire is a kind of chemical reaction -> fire burning wood chips is an example of chemical reaction", " fire burning wood chips is an example of chemical reaction & chemical reactions cause chemical change -> fire burning wood chips causes chemical change to the wood chips", " " ]

[ "chemical reactions cause new materials to form & chemical change is a kind of chemical reaction -> chemical changes cause new materials to form", " " ]

[ "paper burns & fire causes burning -> fire causes paper to burn", " fire causes paper to burn & fire is a kind of chemical reaction -> burning paper with fire is a kind of chemical reaction", " burning paper with fire is a kind of chemical reaction & chemical reactions cause chemical change -> burning paper with fire causes chemical change", " " ]

[ "magnesium is flammable & magnesium is a kind of substance -> magnesium is a flammable substance", " magnesium is a flammable substance & flammability is a property of substance and includes values of flammable / inflammable -> magnesium is a substance that is flammable", " magnesium is a substance that is flammable & if a substance is flammable , it can burn -> magnesium can burn", " " ]

[ "an example of a chemical property is the elements making up a compound & water is a kind of compound -> an example of chemical property is the elements making up water", " an example of chemical property is the elements making up water & water is made of hydrogen and oxygen -> a chemical property of water is that it is made of hydrogen and oxygen", " a chemical property of water is that it is made of hydrogen and oxygen & a compound can be chemically separated into the elements that it is made of -> water can be separated into hydrogen and oxygen", " " ]

[ "a compound being broken down is a kind of chemical change & a compound can be chemically separated into the elements that it is made of -> a compound can only be separated into the elements by chemical change", " a compound can only be separated into the elements by chemical change & when two substances together form a compound then those substances cannot be physically separated -> a compound can only be broken down in chemical change but not physcial changes", " " ]

[ "gold is a pure substance & a pure substance is made up of only one kind of atom -> gold is only made of gold atoms", " " ]

[ "lighting a match causes that match to burn & fire causes burning -> lighting a match is when a fire causes the match to burn", " lighting a match is when a fire causes the match to burn & fire causes chemical change -> lighting a match is an example of chemical change", " " ]

[ "hydrogen is a kind of element & oxygen is a kind of element -> hydrogen and oxygen are different elements", " hydrogen and oxygen are different elements & an element is a kind of substance -> hydrogen and oxygen are different substances", " hydrogen and oxygen are different substances & water is a kind of substance -> hydrogen, oxygen, and water are different substances", " electrical energy is added to water & hydrogen is produced when electrical energy is added to water -> electrical energy causes hydrogen to form from water", " oxygen is produced when electrical energy is added to water & electrical energy is added to water -> electrical energy causes oxygen to form from water", " electrical energy causes hydrogen to form from water & electrical energy causes oxygen to form from water -> electrical energy causes hydrogen and oxygen to form from water", " hydrogen, oxygen, and water are different substances & electrical energy causes hydrogen and oxygen to form from water -> electrical energy causes different substances to form from water", " electrical energy causes different substances to form from water & chemical changes cause different substances to form -> electrical energy causes chemical change to the water", " " ]

[ "lemon juice contains acid & milk contains proteins -> adding lemon juice to milk is similar to combining acid and protein together", " adding lemon juice to milk is similar to combining acid and protein together & combining acid and protein can cause chemical change -> adding lemon juice to milk can cause chemical change", " " ]

[ "carbon dioxide is a new substance produced by sodium bicarbonate under proper conditions & chemical reactions cause new substances to form -> sodium bicarbonate releasing carbon dioxide under proper conditions is a chemical reaction", " sodium bicarbonate releasing carbon dioxide under proper conditions is a chemical reaction & an example of a chemical property is how a material reacts chemically -> releasing carbon dioxide under proper conditions is a kind of chemical property of sodium bicarbonate", " " ]

[ "flammability is a kind of chemical property & flammability is a property of matter -> flammability is a chemical property of matter", " " ]

[ "a beach ball is a kind of container & if a flexible container is pushed on then that container will change shape & a beach ball is flexible -> if a beach ball is pushed on, then the shape of the beach ball will change", " if a beach ball is pushed on, then the shape of the beach ball will change & the beach ball is pushed on the middle -> the shape of the beach ball will change", " matter in the gas phase has variable shape & air is a kind of matter & air is in gas phase -> air is a matter that has variable shape", " air is a matter that has variable shape & matter with variable volume and shape takes the shape and size of its entire container -> air takes the shape of its container", " air takes the shape of its container & a beach ball is a kind of container & the beach ball is filled with air -> air takes the shape of the beach ball", " the shape of the beach ball will change & air takes the shape of the beach ball -> the shape of the air in the beach ball will change with the shape of the beach ball", " " ]

[ "iron is a kind of solid & iron nails are made of iron -> iron nails are solid", " iron nails are solid & state of matter is a property of substance includes values of solid / liquid / gas -> iron nails are solid in state of matter", " iron is a kind of metal & iron nails are made of iron -> iron nails are made of metal", " iron nails are made of metal & a thermal energy conductor conducts heat & metal is a thermal energy conductor -> iron nails can conduct heat", " iron is always magnetic & iron nails are made of iron -> iron nails are magnetic", " iron nails are solid in state of matter & iron nails can conduct heat & iron nails are magnetic -> iron nails can conduct heat and are magnetic and are solid", " " ]

[ "a pencil is a kind of object & sharpening a pencil changes the shape of the pencil -> sharpening a pencil changes the shape of an object", " paper is a kind of object & tearing paper changes the shape of the paper -> tearing paper changes the shape of an object", " sharpening a pencil changes the shape of an object & tearing paper changes the shape of an object -> sharpening a pencil and tearing paper both change the shape of the object", " sharpening a pencil and tearing paper both change the shape of the object & shape is a property of the appearance of an object -> sharpening a pencil and tearing paper both change the appearance of the object", " sharpening a pencil and tearing paper both change the appearance of the object & appearance is a kind of physical property -> sharpening a pencil and tearing paper both change the physical property of the object", " sharpening a pencil and tearing paper both change the physical property of the object & if something undergoes a physical change then the physical properties of that something will change -> pencil and paper underwent a physical change", " " ]

[ "water is a kind of substance & the molecules of a substance cannot move easily past each other in solid state -> the molecules of water cannot move easily past each other in solid state", " the molecules of water cannot move easily past each other in solid state & water changes into a phase where the molecules cannot move easily past each other -> water changes into solid state", " water changes into solid state & a phase change is when a substance changes from one state of matter into another state of matter & solid is a kind of state of matter -> water undergoes a phase change", " water undergoes a phase change & an example of a physical change is a phase change -> water undergoing a phase change is an example of physical change", " water undergoing a phase change is an example of physical change & if something undergoes physical change then the chemical properties of that something will remain unchanged -> the chemical properties of water will remain unchanged", " the chemical properties of water will remain unchanged & being a compound or an element is a chemical property of substances -> water being a compound or an element will remain unchanged", " water being a compound or an element will remain unchanged & water is a kind of compound -> water being a compound will remain unchanged", " " ]

[ "the water pipe freezes & freezing is a kind of phase change -> the water pipe undergoes a phase change", " the water pipe undergoes a phase change & a phase change is a kind of physical change -> the water pipe undergoes a physical change when it freezes", " an example of a physical change is breaking an object & cracking is a kind of breaking -> an object cracking is a kind of physical change", " an object cracking is a kind of physical change & a water pipe is a kind of object -> the water pipe cracking is a kind of physical change", " the water pipe undergoes a physical change when it freezes & the water pipe cracking is a kind of physical change & a water pipe freezes and cracks on a cold night -> the water pipe freezing and cracking is an example of physical change", " the water pipe freezing and cracking is an example of physical change & chemical change is the opposite of physical change -> the water pipe freezing and cracking is an example of physical change but not a chemical change", " " ]

[ "glass is a kind of object & breaking down an object changes that object 's shape -> breaking a glass changes the shape of the glass", " breaking a glass changes the shape of the glass & shape is a kind of physical property -> breaking a glass changes the physical property of the glass", " breaking a glass changes the physical property of the glass & if something undergoes a physical change then the physical properties of that something will change -> breaking a glass is an example of a glass undergoing a physical change", " " ]

[ "heat means temperature increases & a solid is heated -> the temperature of the solid increases", " the temperature of the solid increases & a solid is a kind of substance -> the temperature of the solid substance increases", " the temperature of the solid substance increases & as the temperature of a substance increases , the molecules in that substance will move faster -> the molecules in the solid substance moves faster", " the molecules in the solid substance moves faster & faster means an increase / higher in speed -> the molecules in the solid substance increases in speed", " " ]

[ "solid is a kind of state of matter & gold is a kind of solid -> gold is in solid state", " mercury is liquid at room temperature & liquid is a kind of state of matter -> mercury is in liquid state", " gold is in solid state & mercury is in liquid state -> gold and mercury are in different states of matter", " gold and mercury are in different states of matter & state of matter is a kind of physical property -> gold and mercury are different in a physical property", " " ]

[ "shape is a kind of physical property & breaking a bottle changes the shape of the bottle -> breaking a bottle changes the physical property of the bottle", " breaking a bottle changes the physical property of the bottle & if a thing's physical properties change then it has undergone a physical change -> the bottle undergoes a physical change", " " ]

[ "crumpling is a kind of change of shape action & change of shape actions change the shape of an object -> crumpling changes the shape of an object", " crumpling changes the shape of an object & a sheet of paper is a kind of object -> crumpling changes the shape of a sheet of paper", " " ]

[ "state of matter is a kind of physical property & solid is a kind of state of matter -> solid is a kind of physical property", " solid is a kind of physical property & a mineral is a kind of solid material -> being solid is a physical property of a mineral", " " ]

[ "neutralization is when an acid reacts with a base & neutralization produces water and salt -> neutralization is when an acid reacts with a base and produces water and salt", " " ]

[ "an atom is a kind of particle & matter is made of atoms -> matter is made of particles called atoms", " " ]

[ "electrons are a part of an atom & a electron has a negative -1 electric charge -> electrons are part of an atom that has negative charge", " " ]

[ "the mass of the atom is determined by protons and neutrons & the nucleus of an atom is made of protons and neutrons -> most of the mass of an atom is located in the nucleus", " " ]

[ "mercury is made of mercury atoms & atom is a kind of particle -> mercury is made of atom particles", " mercury is made of atom particles & particles in a solid are closer together than particles in a liquid & mercury changes from liquid state to solid state -> mercury atoms move closer together", " mercury is made of mercury atoms & atom is a kind of particle -> mercury is made of atom particles", " mercury is made of atom particles & particles in a liquid have more kinetic energy than particles in a solid & mercury changes from liquid state to solid state -> mercury atoms have less kinetic energy", " mercury atoms move closer together & mercury atoms have less kinetic energy -> mercury atoms have less kinetic energy and move closer together", " " ]

[ "atomic mass is determined by the sum of protons and neutrons numbers in an atom & protons are a kind of subatomic particle & neutrons are a kind of subatomic particle -> atomic mass is determined by the sum of protons and neutrons particle numbers", " " ]

[ "an atom is a kind of object & losing / gaining electrons causes the electrical charge of an object to be unbalanced -> losing or gaining electrons causes the electrical charge of an atom to be unbalanced", " " ]

[ "protons are found in the nucleus of an atom & a proton has a positive 1 electric charge -> protons are found in the nucleus of an atom and are positvely charged", " " ]

[ "atoms with one or two valence electrons tend to lose those electrons & metal atoms usually have one or two valence electrons -> metal atoms tend to lose electrons", " metal atoms tend to lose electrons & an ion with positive charge is formed by atom losing electrons -> metal atoms losing electrons will form ions with positive charge", " " ]

[ "one neutron has one atomic mass unit & the nucleus of an atom is usually made of both protons and neutrons -> neutrons add mass to the nucleus", " " ]

[ "nucleus is a part of an atom & if something is part of another thing, then another thing consist of that something -> an atom consists of a nucleus", " an atom consists of a nucleus & electrons surround / orbit the nucleus of an atom -> an atom consists of a nucleus surrounded by electrons", " " ]

[ "a proton has a positive 1 electric charge & an electron has a negative -1 electric charge -> equal numbers of protons and electrons result in a neutral 0 electric charge", " equal numbers of protons and electrons result in a neutral 0 electric charge & a neutron has a neutral electric charge -> equal numbers of protons and electrons and any number of neutrons result in a neutral 0 electric charge", " equal numbers of protons and electrons and any number of neutrons result in a neutral 0 electric charge & an atom is made of protons / neutrons / electrons -> if an atom has an equal number of protons and electrons, then the atom will have a neutral charge", " if an atom has an equal number of protons and electrons, then the atom will have a neutral charge & an normal atom has a neutral electric charge -> that atom has an equal number of protons and electrons", " " ]

[ "the nucleus is the center of an atom & electrons orbit the nucleus of an atom -> electrons orbit the center of an atom", " electrons orbit the center of an atom & electrons are a part of an atom -> electrons are part of an atom that orbit the center of an atom", " " ]

[ "a neutron has a neutral electric charge & one neutron has one atomic mass unit -> a neutron is neutral in electric charge and has one atomic mass unit", " a neutron is neutral in electric charge and has one atomic mass unit & neutrons are a kind of subatomic particle -> a neutron is a particle that is neutral in electric charge and has one atomic mass unit", " " ]

[ "an atom is positive 1 in electric charge & if a neutral atom loses an electron then an atom with a positive charge will be formed -> the atom loses an electron", " " ]

[ "a proton has a positive 1 electric charge & a neutron has a neutral 0 electric charge -> protons and neutrons together will be positive in electric charge", " protons and neutrons together will be positive in electric charge & the nucleus of an atom is made of protons and neutrons -> the nucleus of an atom is positve in electric charge", " the nucleus of an atom is positve in electric charge & the nucleus is the center of an atom -> the positive charge is concentrated in the center of an atom", " " ]

[ "atomic mass is determined by the number of protons and neutrons & atomic number is only determined by the number of proton of an element -> the difference between atomic mass and atomic number is the number of the neutrons in an element", " " ]

[ "a electron has a negative -1 electric charge & an electron is a kind of charged particle -> an electron is a kind of negatively charged particle", " an electron is a kind of negatively charged particle & electrons are a part of an atom -> electrons are part of an atom that is negatively-charged", " electrons are part of an atom that is negatively-charged & electrons are involved in chemical reactions -> negatively charged particles are involved in chemical reactions", " " ]

[ "a point is small in size & an atom is exceptionally small in size -> atoms are similar in size with points", " atoms are similar in size with points & angstrom unit is used to measure the distance between two points -> angstrom units can be used to measure the distance between atoms", " " ]

[ "atoms in a gas move independently of one another & atoms in a gas collide frequently & the atoms in a substance move independently of ont another and collide frequently -> the substance is likely a gas", " " ]

[ "baking is when a human makes food by adding heat & a cake is a kind of food -> baking cake is adding heat to the cake", " baking cake is adding heat to the cake & adding heat to an object causes chemical reactions -> baking a cake can cause a chemical reaction to the cake", " " ]

[ "placing a blanket on fire cuts off the oxygen & a fire requires oxygen to burn -> placing a blanket on fire cuts off the oxygen required for fire to burn", " placing a blanket on fire cuts off the oxygen required for fire to burn & if something is required for a process then keeping that something from reaching that process can stop that process -> placing a blanket on fire will stop the fire from burning", " " ]

[ "the drain cleaner is added into water & a drain cleaner consists of sodium hydroxide and aluminum -> sodium hydroxide, aluminum, and water are combined", " sodium hydroxide, aluminum, and water are combined & hydrogen is produced -> hydrogen is produced when sodium, aluminum, and water are combined", " sodium hydroxide, aluminum, and water are combined & the solution becomes really hot -> heat energy is released when sodium hydroxide, aluminum, and water are combined", " hydrogen is produced when sodium, aluminum, and water are combined & heat energy is released when sodium hydroxide, aluminum, and water are combined -> a chemical reaction happened when sodium hydroxide, aluminum, and water are combined", " " ]

[ "iron is a kind of metal & nails are often made of iron -> nails are made of metal", " nails are made of metal & metals in contact with water and oxygen will rust -> nails in contact with water and oxygen will rust", " nails in contact with water and oxygen will rust & rust forming is a kind of chemical change -> nails rusting is a kind of chemical change", " nails rusting is a kind of chemical change & chemical change is a kind of chemical reaction -> nails rusting is a kind of chemical reaction", " " ]

[ "carbon dioxide is a kind of gas & baking soda can react chemically with vinegar producing carbon dioxide -> baking soda can react chemically with vinegar producing a gas", " vinegar is a kind of substance & baking soda is a kind of substance -> combining baking soda and vinegar is combining two substance together", " baking soda can react chemically with vinegar producing a gas & combining baking soda and vinegar is combining two substance together -> combining baking soda and vinegar can cause chemical reactions", " combining baking soda and vinegar can cause chemical reactions & vinegar is added into baking soda -> vinegar being added into baking soda will cause chemical reactions", " " ]

[ "chlorine is a kind of element & sodium is a kind of element -> sodium and chlorine are two elements", " sodium and chlorine are two elements & sodium chloride is always made of chemically combined chlorine and sodium -> sodium chloride is made of two elements chemically combined", " sodium chloride is made of two elements chemically combined & a compound is made of two or more elements chemically combined -> sodium chloride is a compound", " sodium chloride is a compound & sodium and chlorine reacting forms sodium chloride -> sodium and chlorine reacting forms a compound", " " ]

[ "chemical reactions do not cause the total number of atoms to change & photosynthesis is a kind of chemical reaction -> the total number of atoms stay the same in chemical reaction", " the total number of atoms stay the same in chemical reaction & photosynthesis is a kind of chemical reaction -> the total number of atoms stay the same in photosynthesis", " the total number of atoms stay the same in photosynthesis & 6 atoms of carbon involves in photosynthesis & carbon is a kind of atom -> the number of carbon atoms stays at 6 in photosynthesis", " " ]

[ "iron in contact with water and oxygen will rust & rust forming is a kind of chemical change -> iron in contact with water and oxygen is a chemical change", " iron in contact with water and oxygen is a chemical change & chemical change is a kind of chemical reaction -> iron in contact with water and oxygen is a chemical reaction", " iron in contact with water and oxygen is a chemical reaction & chemical reactions cause new substances to form -> iron in contact with water and oxygen will form new substance", " " ]

[ "zinc chloride and hydrogen gas are new substances & hydrochloric acid combing with zinc forms zinc chloride & hydrochloric acid combing with zinc forms hydrogen gas -> hydrochloric acid combing with zinc forms new substances", " hydrochloric acid combing with zinc forms new substances & chemical reactions cause new substances to form -> hydrochloric acid combining with zinc is an example of chemical reaction", " " ]

[ "iron in contact with water and oxygen will rust & rust forming is a kind of chemical change -> iron in contact with water and oxygen causes a chemical change", " iron in contact with water and oxygen causes a chemical change & chemical reactions cause chemical change -> iron in contact with water and oxygen is an example of chemical reactions", " " ]

[ "100 grams vinegar and 5 grams baking soda are combined in a container & baking soda can react chemically with vinegar -> a chemical reaction happens between baking soda and vinegar", " a chemical reaction happens between baking soda and vinegar & the mass of the reactants of a chemical reaction equals to the products of the chemical reaction -> the mass of baking soda and vinegar is equal to the product of the chemical reaction", " gas is produced in the chemical reaction between baking soda and vinegar & gas is trapped in the container & if gases are released by a chemical reaction then the total mass of the product will be less than the total mass of the reactants -> the mass of the final product of the baking soda and vinegar will not be less than the mass of the reactants", " the mass of baking soda and vinegar is equal to the product of the chemical reaction & the mass of the final product of the baking soda and vinegar will not be less than the mass of the reactants -> the mass of the final product of the baking soda and vinegar will be the same as that of baking soda and vinegar", " 100 grams plus 5 grams equals to 105 grams & baking soda is 5 grams & vinegar is 100 grams -> the mass of vinegar and baking soda is 105 grams", " the mass of the final product of the baking soda and vinegar will be the same as that of baking soda and vinegar & the mass of vinegar and baking soda is 105 grams -> the product of the chemical reaction will be 105 grams", " " ]

[ "water is a kind of liquid at room temperature & water is a kind of compound -> water is a liquid compound at room temperature", " water is made of hydrogen and oxygen & hydrogen is a kind of gas at room temperature & oxygen is a kind of gas at room temperature -> water can be made by two gases hydrogen and oxygen", " water is a liquid compound at room temperature & water can be made by two gases hydrogen and oxygen -> water is the liquid compound that can be made by two gases hydrogen and oxygen", " water is the liquid compound that can be made by two gases hydrogen and oxygen & liquid state is a kind of nongaseous state -> water is the nongaseous compound that can be made by two gases", " " ]

[ "substance y and substance z cannot be broken into simpler particles & an element cannot be decomposed into two or more different substances by simple chemical methods -> substance y and substance z are elements", " " ]

[ "a balloon is a kind of container & a balloon filled with helium -> a balloon filled with helium is an example of a container filled with helium", " helium is a kind of element & elements are pure substances -> helium is a pure substance", " a balloon filled with helium is an example of a container filled with helium & helium is a pure substance -> a balloon filled with helium is an example of a container filled with a pure substance", " " ]

[ "iron is a kind of element & rust is made of iron and oxygen & oxygen is a kind of element -> rust is made of iron and oxygen elements", " " ]

[ "table salt is sodum chloride & sodium chloride is always made of chemically combined chlorine and sodium -> table salt is the product of sodium and chloride chemically combined", " " ]

[ "the chemical formula of water is h2o & the number in chemical formula shows the number of atoms of each element in a molecule -> the number in chemical formula of water shows the number of atoms of each element in a water molecule", " the number in chemical formula of water shows the number of atoms of each element in a water molecule & water is made of hydrogen and oxygen -> the number in chemical formula of water shows the number of hydrogen and oxygen in a water molecule", " the number in chemical formula of water shows the number of hydrogen and oxygen in a water molecule & the chemical formula of water is h2o -> a molecule of water is made of 2 hydrogen atoms and 1 oxygen atom", " " ]

[ "the elements in the chemical reaction stays the same after the reaction & oxygen reacts with iron to produce rust -> iron and oxygen elements stay the same after the reaction", " the elements in the chemical reaction stays the same after the reaction & oxygen reacts with hydrogen to produce water -> oxygen and hyrdrogen elements stay the same after the reaction", " iron and oxygen elements stay the same after the reaction & oxygen and hyrdrogen elements stay the same after the reaction -> the elements of two reactions stay the same", " " ]

[ "sugar is made of carbon, hydrogen, oxygen chemically combined & carbon is a kind of element & hydrogen is a kind of element & oxygen is a kind of element -> sugar is made of three different elements chemically combined", " sugar is made of three different elements chemically combined & a compound is made of two or more elements chemically combined -> sugar is a kind of compound", " " ]

[ "organic compounds mainly are made of carbon / hydrogen / oxygen / nitrogen & hydrogen is a kind of element -> hydrogen can be found in organic compounds", " " ]

[ "first-aid instant cold pack is a kind of cold pack & cold pack reaction is a kind of endothermic reaction -> first-aid instant cold pack is a kind of endothermic reaction", " " ]

[ "an atom is a kind of object & structure is a property of an object -> structure of an atom is a property of the atom", " structure of an atom is a property of the atom & organizing is sorting things in order by their properties -> structure of atoms can be used to organize atoms in order", " structure of atoms can be used to organize atoms in order & atoms of different elements have different structures -> structure of atoms of different elements can be used to organize atoms of different elements", " " ]

[ "elements from the same group in the periodic table are chemically reactive in a similar way & alkaline earth metals are highly chemically reactive -> elements that belong to alkaline earth metals are highly chemically reactive", " elements that belong to alkaline earth metals are highly chemically reactive & magnesium belongs to alkaline earth metal family , group 2 on the periodic table -> magnesium is highly chemically reactive", " " ]

[ "magnesium is a kind of alkaline earth metal & fluorine is a kind of gas & magnesium and fluorine react chemically producing magnesium fluoride -> magnesium fluoride is a new substance produced by magnesium and fluorine reacting chemically", " magnesium fluoride is a new substance produced by magnesium and fluorine reacting chemically & chemical reactions cause new substances to form -> a chemical reaction happened between magnesium and fluorine", " a chemical reaction happened between magnesium and fluorine & combining two substances chemically causes chemical reactions -> a chemical reaction is caused by magnesium and fluorine combined chemically", " " ]

[ "an element cannot be decomposed into two or more different substances by simple chemical methods & sulfur cannot be decomposed into different substances by simple chemical methods -> sulfur is a kind of element", " " ]

[ "iron oxide / rust / fe2o3 is made of iron and oxygen & the chemical symbol for oxygen is o & the chemical symbol for iron is fe -> the chemical symbols for the elements found in iron oxide is fe and o", " " ]

[ "the atom is the smallest particle that has the properties of an element & gold is a kind of element -> gold atom is the smallest particle that can be classified as gold", " " ]

[ "iron is a kind of element & the chemical symbol for iron is fe -> fe is the chemical symbol for iron element", " " ]

[ "elements in the same group on the periodic table of elements have similar properties & chemical reactivity is a property of elements and includes ordered values of reactive / unreactive -> elements from the same group on the periodic table are similar in chemical reactivity", " " ]

[ "if something is made of something else , then that something else will be the component of that something & organic compounds mainly are made of carbon / hydrogen / oxygen / nitrogen -> oxygen is a component of organic compounds", " oxygen is a component of organic compounds & a component of something means a part of something -> oxygen is a part of organic molecules", " " ]

[ "oxygen gas is made of only oxygen element & if a substance is made of one element , then the substance is called an element -> oxygen gas is an element", " oxygen gas is an element & o2 is a chemical formula for oxygen gas -> o2 is an element", " " ]

[ "state of matter is a property of matter and includes ordered values of solid / liquid / gas & hydrogen is a kind of gas at room temperature -> the state of matter of hydrogen is gas", " the state of matter of hydrogen is gas & state of matter is a kind of physical property -> being a gas is a physical property of hydrogen", " " ]

[ "the periodic table of elements can be used for predicting the properties of an element & a periodic table is a kind of scientific model -> a periodic table is the scientific model that can be used to predict the properties of an element", " " ]

[ "an element is identified by its number of protons & proton is a kind of subatomic particle -> an element is identified by the proton number", " an element is identified by the proton number & gold is a kind of element -> gold element can be identified by its proton number", " " ]

[ "elements in the same group on the periodic table of elements have similar properties & calcium / beryllium belongs to alkaline earth metal family , group 2 on the periodic table -> beryllium has the most similar chemical properties to calcium", " " ]

[ "the chemical symbol for tellurium is te & tellurium is a kind of metalloid -> te is a kind of metalloid", " antimony is a kind of metalloid & the chemical symbol for antimony is sb -> sb is a kind of metalloid", " te is a kind of metalloid & sb is a kind of metalloid -> sb and te are both metalloids", " " ]

[ "elements from the same group in the periodic table are chemically reactive in a similar way & elements are all from the first group of the periodic table -> elements from the first group are chemically reactive in a similar way", " elements from the first group are chemically reactive in a similar way & if the elements have similar chemical reactivity , then the elements will react with other elements in a similar way -> elements from the first group will react with other elements in a similar way", " elements from the first group will react with other elements in a similar way & oxygen is a kind of element -> elements from the first group will react with oxygen in a similar way", " " ]

[ "if the elements have similar electron configurations , then the elements will be grouped into same family / group on the periodic table of elements & strontium, barium, and radium have similar electrom configurations -> strontium, barium, and radium are grouped together on the periodic table", " " ]

[ "elements in group 18 have complete outer electron shells on the periodic table of elements & helium / neon / argon / krypton / xenon / radon belongs to noble gases family , group 18 on the periodic table -> helium, neon, argon, krypton, xenon, and radon have complete outer electron shells", " helium, neon, argon, krypton, xenon, and radon have complete outer electron shells & if the outermost electron shell of an atom is complete, then the element of those atoms will not react with other elements easily -> helium, neon, argon, krypton, xenon, and radon will not react with other elements easily", " " ]

[ "elements in the same group on the periodic table of elements have similar properties & a physical property is a kind of property -> elements in the same group in the periodic table will have similar physical properties", " " ]

[ "nitrogen and phosphorus belongs to nitrogen family , group 15 on the periodic table & elements in the same group on the periodic table of elements have similar properties -> nitrogen and phosphorus will have similar properties", " nitrogen and phosphorus will have similar properties & the chemical symbol for nitrogen is n & the chemical symbol for phosphorus is p -> n and p will have similar properties", " " ]

[ "the outer electron shell is a part of the electron configuration & elements in group 18 have full / complete outer electron shells on the periodic table of elements -> elements in group 18 have similar electron configuration", " elements in group 18 have similar electron configuration & if the elements have similar electron configurations , then the elements will be grouped into same family / group on the periodic table of elements -> elements in group 18 are grouped together because they have similar electron configuration", " " ]

[ "elements in carbon family have four valence electrons & if the elements are in the same family , then the elements will share the same number of valence electrons -> elements in the carbon family share the same number of valence electrons", " " ]

[ "the chemical symbol for potassium is k & sodium and potassium belong to alkali metals , group 1 on the periodic table & the chemical symbol for sodium is na -> na and k are in the same group", " " ]

[ "mercury is liquid at room temperature & mercury is a kind of metal -> mercury is a metal that is liquid at room temperature", " mercury is a metal that is liquid at room temperature & metals are usually solid at room temperature -> mercury is different from other metals", " " ]

[ "argon is a kind of nonmetal & nonmetals usually have lower conductivity -> argon is the less conductive nonmetal", " argon is the less conductive nonmetal & argon is a kind of element -> argon is the less conductive element", " " ]

[ "boiling means matter / a substance changes from a liquid into a gas by increasing heat energy & water is a kind of substance -> water boiling is when water changes from a liquid into a gas", " water boiling is when water changes from a liquid into a gas & water is in the liquid state , called liquid water , for temperatures between 0 c and 100 c & water is in the gas state , called water vapor / steam, for temperatures above 100 c -> water boiling is when water changes from liquid water to water vapor", " " ]

[ "water is a kind of substance & boiling means matter / a substance changes from a liquid into a gas by increasing heat energy -> water boiling is when water changes from a liquid into a gas by increasing heat energy", " " ]

[ "water is a kind of liquid & the highest temperature a liquid can reach is it's boiling point -> the highest temperature water can reach is it's boiling point", " the highest temperature water can reach is it's boiling point & the boiling point of water is 100c -> the highest temperature water can reach is 100c", " " ]