Chemical Reactions

2. A substance that increases the rate of reaction by lowering the activation energy.
4. A change in which the physical properties change but the chemical composition does not change.
7. A reaction in which an element or a compound reacts with oxygen to form oxide products.
8. The speed at which reactants are used to form products.
10. The energy required to break apart the bonds of the reacting molecules.
12. The gain of electrons by a substance.
14. A reaction in which parts of two different reactants exchange places.
15. The loss of electrons by a substance.
16. The point at which the forward and reverse reactions take place at the same rate so that there is no further change in amounts of reactants and products.

1. When a stress is placed on a system at equilibrium, the reaction shifts to relieve that stress.
3. An element replaces a different element in a compound.
5. The formation of a new substance with a different composition and properties than the initial substance.
6. A reaction that releases heat; the energy of the products is lower than the energy of the reactants.
9. A reaction in which reactants combine to form a single product.
11. A reaction that requires heat; the energy of the products is higher than the energy of the reactants.
13. A reaction in which a single reactant splits into two or more simpler substances.