Lab: Solubility — Unit test Answers

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Which is true about the dissolving process in water?

A
Nonpolar solutes dissolve easily in water.
B
Solute molecules surround water molecules.
C
Molecules or ions of a solute spread throughout the water molecules.
D
Water molecules are repelled by solute ions at the surface of the solute.
22
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A solid precipitate is formed from the reaction of lead nitrate and sodium chromate. What would be the best method to separate this solid from the solution?

A
distillation
B
evaporation
C
filtration
D
sorting
23

Solute crystals are added to a solution until they begin to sink to the bottom of their container. The solution is then heated, and many more solute crystals dissolve. Which term best describes the solution immediately after it was heated?

A
saturated
B
unsaturated
C
concentrated
D
supersaturated
24

Which refers to a mixture that contains more than one phase in which the characteristics of the particles vary throughout the mixture?

A
compound
B
element
C
heterogeneous
D
homogeneous
25

Which is a substance that is made up of only one type of atom?

A
compound
B
element
C
solution
D
mixture

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