Matter Around Us Book Back Questions

7th Standard EM

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Science

Time : 00:45:00 Hrs
Total Marks : 30
    2 x 1 = 2
  1. Which of the following is an example of a metal?

    (a)

    Iron

    (b)

    Oxygen

    (c)

    Helium

    (d)

    Water

  2. 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

  3. 3 x 1 = 3
  4. The smallest particle of matter that can exist by itself______

    ()

    atom

  5. ________of some elements are derived from Latin or Greek names of the elements.

    ()

    Symbol

  6. Elements are the___________ form of pure substances.

    ()

    simplest

  7. 1 x 2 = 2
  8. Directions: Please refer to the following instructions:

    1st Statement 2nd Statement
    Oxygen is a compound Oxygen cannot be broken down into anything simpler
    Hydrogen is an element Hydrogen cannot be broken down into anything simpler
    Air is a compound Air consists of carbon dioxideq
    Air is a mixture of elements only Only nitrogen, oxygen and neon gases exist in air
    Mercury is solid in room temperature Mercury is a non-metal

    A. Both statements are true and the 2nd statement is a correct explanation of the 1st statement.
    B. Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.
    C. The 1st statement is false while the 2nd statement is true.
    D. Both statements are false.

  9. 2 x 2 = 4
  10. Write the chemical formula and name the elements present in the following compounds:
    a. Sodium chloride
    b. Potassium hydroxide
    c. Carbon-di-oxide
    d. Calcium oxide
    e. Sulphur dioxide

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

  12. 3 x 3 = 9
  13. Write the chemical formula for the following elements
    a. Hydrogen
    b. Nitrogen
    c. Ozone
    d. Sulphur

  14. Give an example for the elements derived from their Latin names

  15. What is atomicity of elements?

  16. 2 x 5 = 10
  17. Differentiate metals and non metals.

  18. Differentiate between elements and compounds

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