Energy Change & Rates of Reactions

4. When two molecules combine to form a larger molecule and a small molecule.
5. capacity, C value in certain equations.
9. Law, Mathematical expression obtained by comparing reaction rates with reactant concentrations.
13. Law, Multi-step process used when a reaction cannot be done in a calorimeter.
15. ΔH is greater than Zero.
16. A Branch of chemistry that deals with the relations of heat and chemical reactions.
17. Total amount of thermal energy in a system or substance.
18. Theory, A theory that chemical reactions can occur only if the reactants collide with proper orientation.
19. Equation, An equation that is needed to be successful with Hess's Law.

1. A substance that can alter the rate of a chemical reaction.
2. Thermodynamic equation used for calculating changes in the Gibbs energy of a system.
3. Measurement of the heat flow out of or into the system
6. A measure of the molecular disorder, or randomness, of a system.
7. Order, When the rate is increasing.
8. The reaction or substance changing.
10. Energy, Minium energy that a reactant molecule must possess to have a successful reaction.
11. To separate a substance into simpler compounds. Type of Change.
12. To make (a liquid) thinner or less strong by adding another liquid.
14. Change- Chemical or physical change occurs "naturally".