Matter Around Us Two Marks Questions

7th Standard EM

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Science

Time : 00:45:00 Hrs
Total Marks : 20
    10 x 2 = 20
  1. 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

  2. What do you understand by chemical formula of a compound? What is its significance?

  3. Write the symbols for the following elements and classify them as solid, liquid and gas
    Aluminum, carbon, chlorine, mercury, hydrogen and helium

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

  5. How many elements are known at present?

  6. What is the expansion of IUPAC.

  7. What is the Latin name of Sodium?

  8. What is a chemical formula?

  9. What is the atomicity of H2SO4?

  10. Name the elements is air?

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