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4. identifies each constituent element by its chemical symbol and indicates the proportionate number of atoms of each element.
7. states that in a chemical reaction mass is neither created nor destroyed.
9. a chemical reaction in which one element replaces another in a compound
10. a character, usually a letter or number, that's printed slightly below and to the side of another character
11. a representation of a chemical reaction using symbols of the elements to indicate the amount of substance, usually in moles, of each reactant and product
12. a substance that enters into and is altered in the course of a chemical reaction.

1. a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heat and light in the form of flame
2. a reaction in which a compound breaks down into two or more simpler substances.
3. a substance that is present at the end of a chemical reaction.
4. a constant term related to the properties of a product.
5. reactions that occur when two different atoms or molecules interact to form a different molecule or compound
6. occur when parts of two ionic compounds are exchanged, making two new compounds
8. an arrow that is placed after the reactant or reactants