Chemical Reactions

2. The speed at which reactants become products
4. A chemical reaction in which heat is absorbed from the surroundings
6. A substance that speeds up a chemical reaction without being consumed in the processA substance that speeds up a chemical reaction without being consumed in the process
11. The number written in front of a chemical species in a balanced equation
12. The type of reaction in which a single compound breaks down into two or more simpler substances
13. The unbalanced chemical equation for a chemical reaction
14. The energy stored in the chemical bonds of a substance is called
16. The starting substances in a chemical reaction

1. states that mass can neither be created nor destroyed in a chemical reaction
3. a skeletal equation in which the number of atoms on the are the same on both sides of the arrow
5. The process of breaking down complex substances into simpler ones
7. states that in any chemical reaction, energy is neither created nor destroyed
8. states that bonds are broken when molecules collide with enough energy
9. A reaction in which two or more substances combine to form a new substance
10. A reaction in which oxygen combines with a substance, often producing heat and light
15. The substance that is formed as a result of a chemical reaction