chemical change - changes an object undergoes that change its composition, resulting in a new substance, physical change - changes an object undergoes that affect its state without changing its composition, chemical property - characteristics of an object that indicate its reactivity to other substances, physical property - characteristics of an object that indicate its state, reactant - elements or compounds on the left side of a chemical equation, subscript - the ratio of atoms in a compound, coefficient - shows the total number of molecules present in a formula or compound, product - element or compounds found on the right side of a chemical equation, reversible - the ability of a reaction to reverse itself, molecule - a unit of atoms either bonded with itself or other atoms of elements, atom - the smallest component of building blocks of matter, element - the purest form that makes up a single substance, proton - the physical property of an atom that represents itself with a positive charge and heavy mass, electron - the chemical property of an atom which represents itself with a negative charge and very light mass, valence electrons - the chemical property of the atom which is responsible for bonding and chemical reactivity; found on shells farthest from the nucleus, reactivity - the likelihood an atom is to be stable (near a full outer shell), atomic mass - the combination of two subatomic particles containing mass in the center of the atom, density of water - 1 g/ml; greater than objects sink, less than objects float, compound - 2 or more elements chemically combined,

Chemistry

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