Across
- 4. change that changes the substance
- 7. the amount of a substance in a given volume
- 13. things that help reactions occur at body temperature
- 14. where matter can't enter or leave
- 15. a chemical change that releases energy
- 16. new substance in a chemical change
- 17. a way to show a chemical reaction
- 18. a reaction that occurs when compounds break down into simpler products
- 19. a chemical change that absorbs energy
- 20. when two or more things combine to make a more complex substance
Down
- 1. substance that undergoes a chemical change
- 2. something that decreases the rate of a chemical change
- 3. something that increases reaction rate by lowering activation energy
- 5. the rule that mass cannot be created or destroyed during chemical change
- 6. the minimum amount of energy needed to start a chemical reaction
- 8. where matter can enter or escape to surroundings
- 9. a number placed before a chemical formula in a equation
- 10. when a element replaces another in a compund
- 11. change that does not change substance
- 12. a solid that forms from liquid during a chemical reaction