7F Chemical Reactions

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Across
  1. 5. A type of reaction where new substances are formed.
  2. 6. A chemical that goes cloudy when carbon dioxide is bubbled through it.
  3. 7. Starting chemicals that join together to form a new substance.
  4. 10. A gas which is given off when metals react with acids. It burns with a squeaky pop.
  5. 12. When stone or metal reacts with chemicals in air or water and is worn or changed into a different substance.
  6. 15. The scientific word for burning.
  7. 16. Permanent change, usually a chemical reaction.
Down
  1. 1. A change where no new substances are formed e.g. melting or boiling.
  2. 2. A compound that includes oxygen.
  3. 3. Rain containing sulphuric and nitric acid.
  4. 4. A change in which what you end up with can easily be turned back into what you started with.
  5. 8. A new chemical formed in a chemical reaction.
  6. 9. energy The kind of energy stored in chemicals.
  7. 11. A chemical compound containing only hydrogen and carbon.
  8. 12. dioxide A gas which will put out a lighted splint and turn limewater milky.
  9. 13. Substance formed when iron or steel reacts with oxygen and water.
  10. 14. A chemical that can release energy when it reacts.
  11. 15. Substances that attack metals, stonework and skin are called corrosive e.g. acids