Crossword - Combustion and Chemical Reaction

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Across
  1. 2. A type of chemical reaction where energy is released to the environment.
  2. 3. A reaction in which the products can convert back into the reactants.
  3. 6. two or more atoms connected by chemical bonds
  4. 9. An odorless, colorless gas that is the waste product that your body makes when it uses food for energy.
  5. 12. A pure substance that cannot be broken down by any physical or chemical means into simpler substances.
  6. 15. The ability to do work
  7. 16. Representation of chemical reaction using symbols and formulae of the substances.
  8. 18. A liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluids of living organisms.
  9. 19. When a substance is combined with oxygen
  10. 20. The basic unit of a chemical element
Down
  1. 1. the amount of mass that goes into a chemical reaction in the reactants, must equal the amount of mass that comes out of the reaction process.
  2. 4. A type of reaction that occurs when two or more reactants combine to form a single product.
  3. 5. The substances produced at the end of a chemical reaction.
  4. 7. A type of chemical reaction where energy is absorbed from the environment.
  5. 8. when the products of a chemical reaction cannot be converted back to reactants
  6. 10. The ability to do work
  7. 11. The substances that undergo a chemical reaction
  8. 13. A gas that humans and animals breathe in.
  9. 14. Another term for burning
  10. 17. The compounds that are in most fuels in a combustion reaction.