Across
- 2. a group of atoms combining to together
- 4. a chemical substance composed of many
- 5. make up matter; the faster the particles move,
- 6. during a chemical reaction
- 7. reaction
- 8. reaction One or more substances change to
- 12. A substance that takes part in and undergoes
- 14. particles
- 15. a pure substance that cannot be broken down
- 16. a different substance
Down
- 1. A substance produced during a
- 3. Absorbing heat
- 9. Releasing heat
- 10. molecules
- 11. warmer the matter becomes
- 13. the smallest particle
- 14. Energy The total kinetic (motion) energy of the