Chapter 12 Matter and Properties

Which of the following contains two or more substances that are not uniform in composition and are visibly different?

• Homogeneous mixture

• Heterogeneous mixture

• Solution

• Compound

Answer explanation

A heterogeneous mixture is a blend of two or more kinds of matter (pure substances) that is NOT uniform in composition and does NOT have hte same proportion of components throughout. An example of a heterogeneous mixture is M&Ms. There are clearly different color M&Ms, that are made up of chocolate and a coating that are visibly different.

Which of the following is an example of a homogeneous mixture?

• Salt water

• Pure water

• Skittles

• An saturated solution with extra solute sitting at the bottom of the container.

Answer explanation

A homogeneous mixture is a blend of two or more kinds of matter (pure substances) that is uniform in composition and has the same proportion of components throughtout.

Salt water is a blend of two pure substances (salt and water). The salt is thoroughly dissolved in the water. You cannot tell the salt apart from the water in salt water.

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

• Solid-liquid

• Liquid-liquid

• Gas-gas

• Gas-liquid

Answer explanation

Nitrogen gas is a gas and is the solute.

Air is a gas and it is the solvent.

So this is a gas-gas solute-solvent combination.

The carbonation in soda is what type of solute-solvent combination?

• Solid-liquid

• Liquid-solid

• Gas-liqud

• Liquid-gas

Answer explanation

The carbonation in a soda is an example of a gas-liquid solute-solvent combination.

A gas, carbon dioxide, is dissolved in a liquid, usually water.

Which type of mixture is a heterogeneous mixture made up of two or more pure substances where one substance will settle out unless constantly stirred or agitated; solute particles are so large (>1000 nm) that they scatter light and can be filtered using filter paper?

• Solution

• Alloy

• Suspension

• Colloid

Answer explanation

A suspension is a mixture made up of two or more pure substances where one substances will settle out unless constantly stirred or agitated; solute particles are so large that they scatter light and can be filtered using filter paper.

Which type of mixture is a heterogeneous mixture made up of two or more pure substances where the solute particles are large enough (between 1 nm and 1000 nm) to scatter light but will pass through filter paper?

• Solution

• Alloy

• Suspension

• Colloid

Answer explanation

A colloid is a heterogeneous mixture made up of two or more pure substances where the solute particle are large enough (between 1 nm and 1000 nm) to scatter light but will pass through filter paper.

Which type of mixutre contains particle that are dispersed throughout a single phase and do not settle out?

• Solution

• Heterogeneous mixture

• Suspension

• Colloid

Answer explanation

A solution is a homogeneous mixture made up of two or more pure substances (may be different states of matter) uniformly dispersed throughout a single phase.

Which type of mixture is a homogeneous mixture of the atoms of two or more metals?

• Electrolyte

• Alloy

• Suspension

• Colloid

Answer explanation

An alloy is a homogeneous mixture of the atoms of two or more metals.

Which type of mixture can scatter light but will not pass through filter paper?

• Solution

• Alloy

• Suspension

• Colloid

Answer explanation

A colloid is a heterogeneous mixture made up of two or more pure susbtances where the solute particles are large enough to scatter light but will not pass through filter paper.

Which of the following could be used to tell if a mixture is a solution or a colloid?

• Filtration

• Tyndall Effect

• Electrolyte

• Alloy

Answer explanation

The Tyndall Effect could be used to identify whether a mixture is a solution or a colloid. The particles of a solution (<1 nm) are too small to scatter light. The particles of a colloid (between 1 nm and 1000 nm) are large enough that they will scatter light.