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Questions 6.3.1(b)

  1. State the function of concentrated sulphuric acid in this set-up. Name an alternative substance for concentrated sulphuric acid.

  2. Write equation for the reaction between hydrochloric acid and calcium carbonate.

  3. Name the method of delivery shown in the diagram.

  4. Explain why this method of delivery is suitable for collecting carbon (IV) oxide.

  5. What is the effect of the gas on wet blue litmus paper? What does this show?

  6. What is the effect of inverting the gas jar over the flame of a burning candle?

  7. Normally carbon (IV) oxide does not support burning. But ignited magnesium continues to burn in carbon (IV) oxide with a very hot flame. Suggest a reason for this. What are the other observations? Identify the other products observed.




Answers to Questions 6.3.1(b)

  1. To dry the gas, carbon (IV) oxide. Anhydrous calcium chloride is an alternative for concentrated sulphuric acid.

  2. CaCO3(s)   +   2HCl(aq)   ⟶   CaCl2(aq)   +   H2O(l)   +   CO2(g)

  3. Downward delivery (or upward displacement of air).
  4. Carbon (IV) oxide is denser than air.
  5. Wet blue litmus turns red or pink. It shows that carbon (IV) oxide is acidic.
  6. The flame goes off (It is extinguished).
  7. The hot flame breaks (decomposes) carbon (IV) oxide into the elements carbon and oxygen. Other observations are white powder and black specks. Identities of the other products are: white powder is magnesium oxide; black specks are carbon