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Term 1 Changes Around Us 3 Marks and 5 Marks Questions

8th Standard EM

    Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 40
    5 x 3 = 15
  1. Explain the role of yeast in making cakes?

  2. Justify the statement. Burning of fossil fuels is responsible for global warming.

  3. Is rusting good for Iron materials? Explain.

  4. Do all the fruits and vegetables undergo browning? Explain.

  5. Classify the following day to day activities based on chemical reactions by physical contact, solutions of reactants, heat, light, electricity and catalyst.
    a ) burning of crackers during festivals
    b) addition of water to quicklime to make it slaked lime
    c) silver ornaments become black on exposure to air for a long time
    d) copper vessel kept in open air for long time

  6. 5 x 5 = 25
  7. Explain how food items are spoilt due to chemical reactions?

  8. Explain any three conditions that is required for a chemical reaction to take place by citing one example each.

  9. Explain the biological effects of chemical reactions

  10. Explain the environmental effects of chemical reactions.

  11. What are the effects produced during chemical reactions?

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