Across
- 3. thermal energy must be absorbed in this chemical reaction
- 4. means that there are equal numbers of all atoms on both sides of an equation
- 7. the substances produced during a chemical reaction
- 8. a substance added to a reaction to increase the reaction rate
- 9. a chemical sentence used to describe a chemical reaction
- 11. this occurs when one substance break down into 2 or more substances
- 14. when one or more substances react to form new substances
- 15. the combination of two or more substances
Down
- 1. indicate the number of units of a substance needed for the reaction
- 2. thermal energy is released during this chemical reaction
- 5. occurs when a substance reacts with oxygen to form carbon dioxide and water
- 6. occurs when two or more reactants join to form one prodcut
- 10. a substance added to a reaction to decrease the rate of reaction
- 12. a pure substance made up of atoms
- 13. the starting substances in a chemical reaction