Changes Around Us Two Marks Questions

8th Standard EM

    Reg.No. :
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Science

Time : 00:45:00 Hrs
Total Marks : 20
    10 x 2 = 20
  1. Define a chemical reaction.

  2. Define catalysis

  3. What happens when an iron nail is placed in copper sulphate solution?

  4. What is pollution?

  5. What is Tarnishing? Give an example.

  6. On heating, calcium carbonate gives calcium oxide and oxygen. Is it exothermic reaction or endothermic reaction?

  7. What is the role of a catalyst in a chemical reaction?

  8. What is electrolysis?

  9. What is thermolysis?

  10. What is rancidity?

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