Across
- 3. the amount of space occupied
- 4. the amount of matter
- 7. when one or more substances react
- 9. a physical substance
- 11. substances that are formed during a chemical change
- 12. the ability to do work or cause change
- 14. substance that increases the rate of chemica change
- 16. a pure substance that is formed when two or more different elements combine
Down
- 1. a piece of matter
- 2. any substance that cannot be decomposed
- 4. a group of atoms
- 5. at different temps
- 6. a measure of average kinetic energy of the atoms
- 8. thermal energy transferred between two
- 9. a combination of substances that can be physically separated from one another
- 10. the ability of molecules of the sam substance to stick together
- 13. a substance present before a chemical reaction occurs
- 15. when different molecules are combined