Chapter 12 Chemistry Practice Test

What is the molarity of a solution that contains 0.202 mol KCl in 7.98 L solution?

0.0253 M

What is the molarity of a solution that contains 8.42g of HCl in 7.0 x 10^23 mL solution?

0.33 M

What is the molarity of a solution contains 125g NaCl in 4.00 L solution (Molar mass of NaCl = 58.44)

0.535 M

What is the molarity of a solution that contains 31.0 g HCl in 500. mL solution?

1.70 M

Which mixture contains particles that are in a dispersed phase and do not settle out?

A colloid.

A foam is a colloidal dispersion of

A gas and a liquid.

Which of the following is likely to produce crystals if disturbed?

A supersaturated solution.

Which mixture contains visible particles that settle out unless the mixture is stirred?

A suspension.

All of the following are homogeneous mixtures except

A, soil.

Which of the following is a homogeneous mixture?

B, A sugar-water solution.

Which of the following is a heterogeneous mixture?

C, Whole wheat bread.

All of the following are heterogeneous mixtures except

C, tap water.

Which is not an example of a colloid?

D, Sugar water.

A substance whose water solution is a good conductor of electricity is an

Electrolyte.

Oxygen in nitrogen is an example of which solute-solvent?

Gas-gas.

Carbon dioxide dissolved in water is an example of which solute-solvent combination?

Gas-liquid.

Raising the collision rate between solute and solvent

Increases the rate of dissolution.

A solute crystal is dropped into a solution containing dissolved solute.It falls to the bottom of the beaker and does not dissolve after vigorous stirring. What does this indicate about the solution?

It is probably saturated.

Water in air is an example of which solute-solvent combination?

Liquid-gas.

Sugar dissolved in water is an example of which solute-solvent combination?

Solid-liquid.

Forces holding particles together are strongest in a:

Solid.

The Tyndall effect is used to distinguish between

Solutions and colloids.

If the amount of solute present in a solution at a given temperature is less than the maximum amount that can dissolve at the temperature, the solution is said to be

Unsaturated.

Which of the following does NOT increase the rate of dissolving a solid in water?

Using larger pieces of solid.

Which of the following is an electrolyte?

a polar substance.

In a solution, the slightly charged part of a water molecule

attracts the ions in ionic compounds.

Stirring increases the rate of dissolution because it

brings fresh solvent into contact with the solute.

The particles in both gases and liquids

can change positions with other particles.

An apparatus for testing conductivity is placed in a solution. The power supply is turned on and the light bulb glows brightly. This indicates that the solution

contains an electrolyte.

As temperature increases, solubility of gases in liquids

decreases.

Which of the following decreases the average kinetic energy of solvent molecules?

decreasing the temperature.

According to the kinetic-molecular theory, gases condense into liquids because of

forces between molecules.

Pressure has the greatest effect on the solubility of

gases in liquids.

Increasing the surface area of the solute

increases the rate of dissolution.

The solubility of gases in liquids

increases with increasing pressure.

Raising solvent temperature causes solvent-solute collisions to become

more frequent and more energetic.

A substance whose water solution is a poor conduction of electricity is a

nonelectrolyte.

"Like dissolves like" is a very general rule used for predicting whether

one substance will form a solution with another.

Which of the following will dissolve most rapidly?

powdered sugar in hot water.

Colloids...

scatter light.

A heterogeneous mixture always contains

two or more substances that are visibly distinguishable.

As temperature increases, solubility of solids in liquids

usually increases.

Two immiscible liquids

will not form a solution.