Combustion and Chemical reactions

Edit Answers
1234567891011121314151617181920
Across
  1. 5. Two or more atoms joined together.
  2. 6. Tiny particles and gases released during burning.
  3. 7. A new substance made in a reaction.
  4. 13. A gas often produced during combustion.
  5. 14. Energy that makes things warmer.
  6. 16. The idea that mass is not created or destroyed.
  7. 18. A rule in science that is always true.
  8. 19. The smallest unit of an element.
  9. 20. A gas needed for most burning reactions.
Down
  1. 1. A chemical reaction that releases heat and light.
  2. 2. The visible, glowing part of a fire.
  3. 3. A gas that can form when something burns.
  4. 4. A starting substance in a chemical reaction.
  5. 8. A process where substances change into new substances.
  6. 9. The ability to cause change.
  7. 10. A substance that burns to release energy.
  8. 11. A change that forms a new substance.
  9. 12. Energy you can see, often produced during burning.
  10. 15. The amount of matter in something.
  11. 17. The process of starting a combustion reaction.