Chemical Reactions and Equations

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Across
  1. 1. formed when copper reacts with oxygen
  2. 3. Hydrogen reacts with oxygen
  3. 6. added to prevent rancidity
  4. 8. substances take part in chemical reaction
  5. 9. barium sulphate
  6. 10. gain of oxygen
Down
  1. 2. heat is released
  2. 4. reaction carried out by electricity
  3. 5. heat is absorbed
  4. 7. gain of hydrogen rusting common corrosion of metals