Rates of reaction

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Across
  1. 3. the substance that is formed as a result of a chemical reaction. (6 letters)
  2. 4. A substance that speeds up a chemical reaction without being used up itself. (7 letters)
  3. 6. A substance that increases the rate of a chemical reaction. (6 letters)
  4. 7. A type of reaction where heat energy is given out. (9 letters)
Down
  1. 1. The substance that gets used up in a chemical reaction. (7 letters)
  2. 2. A type of reaction where heat energy is taken in. (9 letters)
  3. 5. A measure of how fast a reaction happens. (5 letters)