Round 1

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Across
  1. 1. environmental problem linked to rising CO2 levels in the atmosphere
  2. 5. substance which releases energy
  3. 6. contributes to acid rain
  4. 8. effect of catalyst on rate of reaction
  5. 9. gas needed for combustion
  6. 10. periodic table version 1
  7. 11. gases family of unsociable elements
Down
  1. 1. carbon dioxide and water are examples
  2. 2. substance with the formula CaSO4
  3. 3. Gaseous element which exists as diatomic molecules
  4. 4. crude oil is separated into fractions based on
  5. 7. The periodic table is a table of