Across
- 3. reaction is a process that leads to the chemical transformation of one set of chemical substances to another.
- 6. reactions release heat energy.
- 9. is the amount of substance present in a certain volume.
- 10. a substance that slows down a chemical reaction.
- 11. reactions absorb heat energy.
Down
- 1. of reaction tells how fast a reaction occurs after it has started.
- 2. is a substance that speeds up a chemical reaction.
- 3. equation tells chemist at a glance the reactants, products, physical sate, and the proportions of each substance present.
- 4. a substance that forms as a result of the reaction.
- 5. is the substance that exists before the reaction beings.
- 7. energy to start a chemical reaction you need this energy.
- 8. are large protein molecules that speed up reactions needed for your cells to work properly.