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Across
  1. 6. The three elements needed to start a fire: fuel, oxygen, and ____.
  2. 7. The number placed before a formula in a balanced equationEndothermic
  3. 10. A substance that increases the rate of a reaction without being consumed.
  4. 11. The black, powdery carbon residue left from incomplete burning.
  5. 12. A material (like coal, gas, or oil) that is burned to produce heat or power.
  6. 13. The new substance(s) formed from a chemical reaction.
Down
  1. 1. A type of reaction where a compound breaks down into two or more simpler substances.
  2. 2. A solid that forms from a solution during a chemical reaction.
  3. 3. A reaction where two substances interact to form one new compoundRusting
  4. 4. he substance that takes part in and undergoes change during a reaction.
  5. 5. he type of reaction that releases energy, characteristic of combustion.
  6. 8. A reaction occurring when there is a limited supply of oxygen.
  7. 9. A compound containing only carbon and hydrogen, often used as fuel.