Combustion

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Across
  1. 2. The minimum energy needed to start a reaction
  2. 4. A chemical reaction or physical change that absorbs heat from its surroundings
  3. 6. rate: The measure of how fast a reaction happens
  4. 11. A substance that speeds up a reaction without being used up
  5. 12. The substance that burns in a combustion reaction
  6. 13. A substance that starts a chemical reaction.
  7. 14. A chemical change where new substances are formed
  8. 17. Heat, temperature, or energy produced by the movement of particles
  9. 18. breaking down a compound into simpler substances.
  10. 20. A chemical equation written using symbols and formulas
Down
  1. 1. The law stating matter cannot be created or destroyed
  2. 3. A solid formed from a chemical reaction in a liquid
  3. 5. A reaction that releases energy
  4. 7. When an acid and a base react to form water and a salt
  5. 8. The…of 4 times 3 is 12
  6. 9. A reaction that gives off light
  7. 10. What happens when you light a tree on fire?
  8. 15. A chemical reaction that releases heat and light
  9. 16. A chemical reaction where substances combine with oxygen
  10. 19. What human breathes in