Question

1)Which of the following compounds will be more soluble in pentane (C5H12)? Why?

A) pentanol (CH3CH2CH2CH2CH2OH)

B) benzene (C6H6)

C) acetic acid (CH3CO2H)

D) ethyl methyl ketone (CH3CH2COCH3)

2) The phrase "equal dissolves equal" is used to predict the formation of solutions. This implies that: Why?

A) polar solvents tend to dissolve ionic or polar solutes

B) non-polar solvents tend to dissolve ionic or polar solutes

C) non-polar solvents tend to dissolve non-polar solutes

D) Alternatives a and c are correct.

3) In which of the following steps is the ΔHmix <0? Why?

A) when the solute is separated into its constituent particles

B) when the solvent particles are separated to make room for solute molecules

C) when the particles of solute through intermolecular forces with solvent particles D) None of the above is correct.

4) When the sugar dissolves in water, when the temperature increases: Why?

A) the sugar will dissolve faster

B) not much sugar will dissolve

C) the sugar will dissolve slowly

D) the temperature will not affect the speed with which the sugar dissolves.

5) What happens when a can of soda opens? A) The solubility of CO2 increases. Why?

B) The solubility of CO2 decreases.

C) The solubility of CO2 is not affected.

D) None of the above is correct.