1. Which of the following pairs of substances can be separated by heating?
A Ammonium chloride and iodine
B Potassium iodide and copper (II) sulfate
C Copper (II) sulfate and sodium chloride
D Sodium chloride and ammonium chloride
2. Two liquids have the same boiling point and are completely soluble in each other. Which method would you use to try to separate them?
B fractional distillation
D using separating funnel
3. Copper(II) sulfate crystals can be separated from sand using the four processes listed below. The order in which these processes should be used is
1st 2nd 3rd 4th
A filtration solution crystallization evaporation
B solution evaporation filtration crystallization
C filtration solution evaporation crystallization
D solution filtration evaporation crystallization
4. At which temperature does a concentrated aqueous solution of sodium chloride begin to boil?
5. A chromatography experiment was carried out using a drop of a solution of an alloy, German silver. The results is shown below:
We can conclude that the metals present in German silver are
A aluminium, copper and nickel.
B aluminum, nickel and silver.
C copper, nickel and zinc.
D copper, silver and zinc.
6. A sample of solid X melts gradually over a large range of temperatures. However, the liquid that is formed on heating solid X solidifies at one temperature. This sample most likely contains
A a pure compound.
B a mixture of compounds miscible in the liquid state.
C a mixture of two or more compounds that combine to form a new compound when solid X was melted.
D a mixture of compounds immiscible in the liquid state.
7. Two liquids, dichloromethane and water, are separated using separating funnel. Dichloromethane is drained off first.
Which statement about dichloromethane is correct?
A It is miscible with water and is denser than water.
B It is immiscible with water and is less dense than water.
C It is miscible with water and is less dense than water.
D It is immiscible with water and is denser than water.