Chemistry Practice Test Solutions

What 2 factors both affect the solubility of a particular substance?

Temperature and particle size

What usually makes a solid dissolve faster in a solvent?

Agitation

If more solute is added to a solution and it dissolves, the original solution was...?

Unsaturated

Which of the following substances is less soluble in hot water than in cold water?

NaCl

If a single crystal is added to a solution and many particles of the solute come out of the solution, the original solution was...?

Supersaturated

If the pressure of a gas above a liquid is increased, the solubility of the gas in the liquid will...?

Increase

A dilute solution is one in which there is a...?

Small amount of solute in a large amount of solvent

In general, as the temperature of a solution composed of a gas in a liquid is increased, the solubility of the gas...?

Decreases

Which of the following pairs of substances are miscible?

a) water and ethanol

b) water and gasoline

c) water and sodium chloride

d) water and vegetable oil

Water and ethanol

Colligative properties depend upon...?

The number of particles dissolved in a given mass of solvent

Why does a solute depress the freezing point?

Because the solute disrupts crystal formation by the solvent

The process of the ions of a solute being surrounded by the particles of a solvent is called...?

Solvation

Which 2 substances would be most likely to dissolve in a polar solvent

Polar and ionic compound

Compounds that have water molecules as part of their crystal structure are called...?

Hydrates

Substances that absorb water out of the air are called...?

Hygroscopic

If a mixture settles into separate parts when allowed to stand, it is a...?

Suspension

If a beam of light can be seen in a mixture, the mixture is a...?

Colloid

Muddy water is an example of a...?

Suspension

Fog is an example of a...?

Solution

What is the formula for Barium Hydroxide Octahydrate?

Ba(OH)2 . 8H2O

Most substances contract and become more dense when they go from a liquid to a solid. One exception to this is...?

Carbon dioxide

When 3 mols of a solute are dissolved in a solvent, what happens to the freezing point and boiling point of the solvent?

The freezing point goes down and the boiling point goes up

At what temperature does liquid water have its maximum density?

4 degrees C

If one mole of each of the following substances is dissolved in 1 liter of water, which solution will have the lowest freezing point?

a) HCL

b) NaCl

c) MgCl2

d) HNO3

What property explains why water beads up on a newly waxed car and why certain insects can walk on water?

High surface tension

Which bond is primarily responsible for holding water molecules together in liquid state?

Hydrogen bonds