Across
- 4. a way to describe a chemical reaction using chemical formulas and other symbols
- 5. the substances that react
- 6. a substance that speeds up a chemical reaction without changing itself
- 8. when one element replaces another in a compound
- 15. when two or more substances combine to form a new substance
Down
- 1. when a substance reacts with oxygen to produce energy in the form of heat and light
- 2. the balancing process that involves changing coefficients in a reaction
- 3. the minimum amount of energy needed to start a reaction
- 7. when the positive ion of one compound replaces that of another compound to form two new compounds
- 9. when one substance breaks down into another substance
- 10. the new substances produced
- 11. when energy is given off as heat
- 12. the speed at which reactants are consumed and products are given
- 13. substances used to slow a chemical reaction
- 14. Reaction when energy is needed in the form of heat