Across
- 4. substance with a pH less than seven
- 5. describes objects or substances that float in water
- 7. measure of the average kinetic energy of matter
- 10. temperature scale used in the United States
- 11. chemical reaction that gives off energy
- 12. new substance formed by a chemical reaction
- 15. instrument used to measure mass of matter
- 16. amount of matter a substance contains
- 18. occurs when a compound breaks down into two or more elements or simpler compounds
- 19. occurs when two or more elements or compounds that make a new compound
- 20. standard international measure of temperature
- 21. pH of pure water
Down
- 1. amount of space matter takes up
- 2. substance that is being changed
- 3. substance with a density of one
- 6. chemical reaction that occurs when an acid and a base react
- 8. chemical reaction that absorbs or gains energy
- 9. temperature used by scientists worldwide
- 13. occurs when an organic compound is heated and reacts with oxygen
- 14. substance with a pH greater than seven
- 17. measure of how tightly the atoms or molecules in matter are packed together