Across
- 5. is allowed to enter or leave
- 6. The minimum amount of energy needed.
- 12. Reaction (oxygen&fuel) results in fire.
- 13. How many atoms or molecules are shown
- 17. Changes the physical features only.
- 18. material that increases the rate of reaction
- 19. ability to change into new substance
- 20. C.C that result in a new substance
- 22. Releases energy when it burns.
- 23. decreases the rate of reaction
- 24. A solid that forms from a solution during
- 25. lowers the energy of reaction in cells
Down
- 1. When one element replaces another.
- 2. The result of a chemical reaction
- 3. isn’t created or destroyed
- 4. releases energy in form of heat.
- 7. trait that can be observed
- 8. can enter or escape the system
- 9. that enters into a chemical reaction
- 10. absorbs energy in form of heat.
- 11. A chemical that breaks down
- 14. studies of matter
- 15. amount of one material in another
- 16. 2+ substances combine to form new substance.
- 19. show a chemical reaction with symbols
- 21. Anything that has mass or occupies space.