Self assessment
Question 1 of 5
Which of the following pairs of liquids are immiscible?
A
Methanol and water.
B
Methanol and cyclohexane.
C
Ethylethanaote and water.
D
Hexane and octane.
What type of equilibrium is present when a solute is added to two immiscible liquids?
A
Dynamic equilibrium.
B
Homogeneous equilibrium.
C
Heterogeneous equilibrium.
D
Static equilibrium.
What does the value of a partition coefficient depend upon?
A
The identity of the two immiscible liquids.
B
The temperature.
C
The amount of solute.
D
The volumes of the immiscible liquids.
The partition coefficient for the pesticide DDT between octanol and water is 9.5 x 105. What does this tell you?
A
DDT is more soluble in octanol than it is in water.
B
DDT is more soluble in water than it is in octanol.
C
DDT is toxic to humans.
D
DDT is likely to accumulate in the fatty tisue of insects.
Why are a few drops of cyclohexane often added when testing for the presence of low concentraions of iodine in the laboratory?
A
Cyclohexane reacts with iodine to give a purple product.
B
Iodine is much more soluble in cyclohexane than it is in water.
C
A solution of iodine in cyclohexane is intensely coloured and easy to see.
D
Cyclohexane is an oxidising agent.