Across
- 3. the amount of a substance in a given volume
- 4. a way to show a chemical reaction but with symbols
- 6. a number placed in front of a chemical formula in an equation
- 11. a material used to decrease the rate of a chemical reaction
- 12. substances that undergo chemical changes
- 14. where matter can enter or escape to the surroundings
- 15. when one element replaces another element in a compound
- 16. new substances that form
- 17. increases the reactiog rate by lowering the activation energy
- 18. a solid that forms liquids during a chemical reaction
- 19. any change that altes the appernce or a substace
Down
- 1. when 2 or more elements combine to make a more complex substace
- 2. states that matter can not be created or destroyed
- 5. energy being absor
- 7. biological catalyst that help these reactions occur at body tempreature
- 8. a reaction occurs when compounds breakdown into simpler
- 9. minimum amount of energy to start a chemical reaction
- 10. energy being released
- 13. a change where one substace becomes a different substance
- 20. where matter can not enter or escape