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Matter Around Us Model Question Paper

7th Standard EM

    Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 40
    5 x 1 = 5
  1. Which of the following is a short and scientific way of representing one molecule of an element or compound?

    (a)

    Mathematical formula

    (b)

    Chemical formula

    (c)

    Mathematical symbol

    (d)

    Chemical symbol

  2. The metals which is a liquid at room temperature

    (a)

    Chlorine

    (b)

    Sulphur

    (c)

    Mercury

    (d)

    Silver

  3. The most abundant type of atom is the universe is _____________

    (a)

    Helium

    (b)

    Hydrogen

    (c)

    Argon

    (d)

    Argon

  4. _____________ is a substance that is made up of three oxygen atoms chemically combined.

    (a)

    Oxygen

    (b)

    Hydrogen

    (c)

    Ozone

    (d)

    CO2

  5. A molecule containing three atoms is called a __________ molecule

    (a)

    monoatomic

    (b)

    diatomic

    (c)

    triatomic

    (d)

    polyatomic

  6. 5 x 2 = 10
  7. Write the symbols for the following elements and classify them as solid, liquid and gas
    Aluminum, carbon, chlorine, mercury, hydrogen and helium

  8. Classify the following as metals, non-metals and metalloids
    Sodium, Bismuth, Silver, Nitrogen, Silicon, carbon, chlorine, Iron, copper.

  9. What is a molecule?

  10. What is a chemical formula?

  11. Name the elements is air?

  12. 5 x 3 = 15
  13. Lists the metals, non-metals and metalloids which you used in your house, schools. Compare their properties

  14. What changes take place in the movement and arrangement of particles during heating process?

  15. What are the 3 most abundant atoms on the earth?

  16. Give an account of elements known to us

  17. Write any two properties of a compound.

  18. 2 x 5 = 10
  19. Explain the characteristics of compounds

  20. (i) Draw the symbol for some elements as proposed by Dalton.
    (ii) What are rules to be followed while assigning symbol to element.

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