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Science Vocab
Question | Answer |
---|---|
Law of Conservation of Mass | molecules cannot be broken or created |
Physical Change | usually a reversible change of a substance in size or shape |
Chemical Change | when two substances combine to form new substances |
Element | one of a substance that cannot be broken down because it is in its simplest form. |
Chemical Formula | a substance using symbols for its component elements |
Element (Diatomic) Molecule | when two or more elements combine chemically with only one element |
Compound Molecule | made of molecules not ions; atoms in the compound are bound together by shared electrons |
Chemical Equation | a chemical reaction using symbols of the elements to indicate each reactant and product |
Chemical Reaction | process that involves changes in the structure and energy content of atoms and molecules |
Reactants (chemical equation) | substances that go through a chemical change |
Products (chemical equation) | substances that result from a chemical change |
Coefficient (chemical equation) | tells the number of molecules; no coefficient means 1 molecule |
Subscript (chemical equation) | tells the number of a certain type of atom in one molecule |