Across
- 6. a short way to show a chemcal reaction
- 7. the reaction of two elements
- 11. when matter can enter or leave
- 12. a material that increase the rate of a reaction
- 14. the result of the combined reaction
- 16. a number placed in front of the chemical
- 17. a material that increase the rate of burning.
- 18. when one element replaces another
- 22. a principle that provides an explanation of what happens when reactants combine
- 23. a solid that forms from a chemical solution
- 24. the minimum amount of energy needed to start a chemical reaction.
- 25. the amount a substance is given to fill a certain volume.
Down
- 1. a property that can be observed through telescopes but not touched
- 2. the study of matter
- 3. the substance you test with at the beginning
- 4. a property that can be observed and touches
- 5. a rapid reaction between 2 elements
- 8. when energy is released
- 9. when matter is not allowed to enter or leave.
- 10. changes that require microscopes
- 13. when energy is absorbed
- 15. when elements break down
- 19. an object used to decrease the rate of reaction
- 20. changes that can be observed physically
- 21. anything that takes up space