10 minutes maximum! Can you do it in 5?

1. Soluble salts can be prepared by reacting a dilute acid with a ...

  1. metal
  2. metal oxide
  3. metal carbonate

Which methods listed above could be used to prepare copper(II)sulfate?

  • A.  1, 2 and 3
  • B.  1 and 2 only
  • C.  1 and 3 only
  • D   2 and 3 only

Q2-3:
Zinc chloride is produced by adding an excess of zinc oxide to a beaker of dilute hydrochloric acid. The mixture is stirred and the acid neutralized.

  
2. How could you tell when all the acid is neutralized?
  • A.   the reaction stops fizzing
  • B.   the solution turns green
  • C.   the solid changes colour
  • D.   the solid stops disappearing
3. The products of the reactions are:
  • A.   zinc chloride  + water
  • B.   zinc chloride + hydrogen
  • C.   zinc sulfate + water
  • D.   zinc sulfate + hydrogen

Q4-8:

Zinc sulfate crystals can be prepared by reacting excess zinc carbonate with dilute sulfuric acid.
The excess zinc carbonate is then removed from the solution and the solution is partially evaporated and cooled.
Minerallad | CC 3.0
4. Which piece of equipment would NOT be required in the preparation of zinc sulfate crystals?
  • A.   evaporating basin
  • B.   condenser
  • C.   beaker
  • D.   filter funnel

5. How could you tell when all the acid is neutralized?

  • A.   the reaction stops fizzing
  • B.   the solution turns green
  • C.   the solid changes colour
  • D.   the solid has all disappeared
6. The reason for using excess zinc carbonate in this preparation is ...
  • A.   to produce carbon dioxide gas
  • B.   because zinc carbonate reacts quickly
  • C.   to ensure that all the dilute sulfuric acid has reacted
  • D.   to ensure that all the zinc carbonate has reacted
7. The excess zinc carbonate would be removed from the mixture by ...
  • A.   filtration
  • B.   crystallisation
  • C.   distillation
  • D.   dissolving

8. Solid zinc sulfate is obtained from the solution by ...

  • A.   filtration
  • B.   crystallization
  • C.   distillation
  • D.   dissolving
9. Magnesium chloride solution can be prepared using dilute hydrochloric acid and excess magnesium oxide. Which two processes are involved in this preparation?
  • A.   precipitation and filtration
  • B.   precipitation and distillation
  • C.   neutralization and filtration
  • D.   neutralization and distillation
10. Steps to obtain a pure, dry sample of hydrated copper(II)sulfate crystals from a copper(II)sulfate solution include:  
A Heat to evaporate all the water Dry crystals in a hot oven
B Heat to evaporate all the water Dry crystals using filter paper or a paper towel
C Heat to partially evaporate the solution Dry crystals in a hot oven
D Heat to partially evaporate the solution Dry crystals using filter paper or a paper towel