Term 1 Atomic Structure 3 Marks Questions

9th Standard

    Reg.No. :
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Science

Time : 00:45:00 Hrs
Total Marks : 30
    10 x 3 = 30
  1. Methane burns in oxygen to form carbon dioxide and water vapour as given by the equation
    CH4(g) + 2O2(g) ➝ CO2(g)+ 2H2O(g)
    Calculate: (i) the volume of oxygen needed to burn completely 50 cm3 of methane and (ii) the volume of carbon dioxide formed in this case.

  2. An atom has 11 protons, 11 electrons and 12 neutrons. What is the atomic number and the name of the element?

  3. Calculate the atomic number of an element whose mass number is 39 and number of neutrons is 20. Also find the name of the element

  4. State the law of multiple proportions

  5. List the uses of isotopes?

  6. What is isotone? Give an example

  7. Draw the structure of oxygen and sulphur atoms

  8. Calculate the number of neutrons, protons and electrons (i) atomic number 3 and mass number 7 (ii)atomic number 92 and mass number238

  9. Assign the valency of magnesium and sulphur

  10. Define quantum numbers

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