Separation of Mixtures

1.     Under which conditions of temperature and pressure is a gas most soluble in water?

• 1. high temperature and low pressure

• 1. high temperature and high pressure

• 1. low temperature and low pressure

• low temperature and high pressure

1.     Which property of an unsaturated solution of sodium chloride in water remains the same when more water is added to the solution?

• 1. density of the solution

• 1. boiling point of the solution

• 1. mass of sodium chloride in the solution

• percent by mass of water in the solution

3.     What would be the best method to separate a mixture of aqueous LiF into its components?

• a) filtration                 

• b) distillation                          

• c) decomposition                                           

• d) gravity separation

1.     Which of the following could be separated using filtration?

• a)     NH₄Br

• b)    Mg(NO₃)₂

• c)     AlPO₄

• d)    K₂S

1.     Which process is commonly used to separate a mixture of ethanol and water?

• a)     distillation

• b)    ionization

• c)     filtration

• d)    titration

1.     The difference in which property allows the separation of a sample of water and sand by using filter paper and a funnel?

• 1. boiling point

• 2. melting point

• particle size

• sample volume

1.     In a laboratory investigation, a student separates colored compounds obtained from a mixture of crushed spinach leaves and water by using paper chromatography. The colored compounds separate because of differences in

• 1. Molecular polarity

• 1. malleability

• 1. boiling point

• electrical conductivity

1.     In order to separate several miscible liquids by fractional distillation, the components should have

• A) large differences between their boiling points

• B) very small differences between their boiling points

• C) large differences between their freezing points

• D) very small differences between their freezing point