Term 2 Atomic Structure Model Question Paper

8th Standard EM

    Reg.No. :
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Science

Time : 00:45:00 Hrs
Total Marks : 35
    5 x 1 = 5
  1. The same proportion of carbon and oxygen in the carbon dioxide obtained from different sources proves the law of __________

    (a)

    reciprocal proportion

    (b)

    definite proportion

    (c)

    multiple proportion

    (d)

    conservation of mass

  2. Cathode rays are made up of

    (a)

    neutral particles

    (b)

    positively charged particles

    (c)

    negatively charged particles

    (d)

    None of the above

  3. In water, hydrogen and oxygen are combined in the ratio of _______by mass.

    (a)

    1:8

    (b)

    8:1

    (c)

    2:3

    (d)

    1:3

  4. Which of the following statements made by Dalton has not undergone any change?

    (a)

    Atoms cannot be broken.

    (b)

    Atoms combine in small, whole numbers to form compounds.

    (c)

    Elements are made up of atoms.

    (d)

    All atoms of an elements are alike

  5. In all atoms of an element

    (a)

    the atomic and the mass number are same.

    (b)

    the mass number is same and the atomic number is different

    (c)

    the atomic number is same and the mass number is different

    (d)

    both atomic and mass numbers may vary.

  6. 4 x 2 = 8
  7. State the law of conservation of mass.

  8. State the law of constant proportions.

  9. Write the properties of anode rays.

  10. Write the names of the following compounds.
    a) CO b) N2O c) NO2 d) PCl5

  11. 4 x 3 = 12
  12. Find the valency of the element which is underlined in the following formula.
    a) NaCl
    b) CO2
    c) Al (PO4)
    d) Ba (NO3)2
    e) CaCl2

  13. Write the chemical formula for the following compounds
    a) Aluminium sulphate b) Silver nitrate c) Magnesium oxide d) Barium chloride

  14. Write the skeleton equation for the following word equation and then balance them.
    a) Carbon + Oxygen → Carbon dioxide
    b) Phosphorus + Chlorine → Phosphorus pentachloride.
    c) Sulphur + Oxygen → Sulphur dioxide
    d) Magnesium + hydrogen → Magnesium + Hydrogen chloride chloride

  15. Balance the following chemical equation.
    a) Na + O2 → Na2O
    b) Ca + N2 → Ca3N2
    c) N2+ H2 →NH3
    d) CaCO3 +HCl → CaCl2 + CO2 +H2O
    e) Pb(NO3)2 → PbO + NO2 + O2

  16. 2 x 5 = 10
  17. Why does a light paddle wheel placed in the path of cathode rays begin to rotate, when cathode rays fall on it?

  18. How can we prove that the electrons carry negative charge?

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