Unit 12 Solutions, Acids and Bases

Which type of mixture has particles that are < 1 nm and appears clear?

• Colloid
• Suspension
• Solution
• Precipitate
• Mixture

Answer explanation

Solutions are homogeneous mixtures with particle sizes under 1 nm and appear clear.

What is the name for the substance that gets dissolved in a solution?

• Solvent
• Solute
• Precipitate
• Colloid
• Diluent

Answer explanation

The solute is the substance that dissolves in the solvent.

What property distinguishes a colloid from a true solution?

• It settles over time
• It conducts electricity
• It is homogeneous
• It scatters light
• It dissolves easily

Answer explanation

Colloids scatter light due to the Tyndall effect, unlike true solutions.

Which type of mixture is cloudy and separates over time?

• Colloid
• Solution
• Suspension
• Alloy
• Saturated mixture

Answer explanation

Suspensions are heterogeneous and unstable, eventually settling out.

Identify the solute and solvent in vinegar (5% acetic acid in water).

• Water = solute, acid = solvent
• Both are solvents
• Acid = solute, water = solvent
• Equal parts solute/solvent
• Water is the solution

Answer explanation

In vinegar, acetic acid is the solute and water is the solvent.

Which type of mixture shows the Tyndall effect but remains stable over time?

• Solution
• Colloid
• Suspension
• Precipitate
• Alloy

Answer explanation

Colloids are stable mixtures that scatter light (Tyndall effect).

Which statement about 'miscible' liquids is TRUE?

• They do not mix
• They separate quickly
• They mix in all proportions
• They only mix when heated
• They require a third substance to dissolve

Answer explanation

Miscible liquids mix completely in all proportions.

What is the Tyndall effect?

• Precipitation of solids
• Separation of mixtures
• Scattering of light by particles
• Ion exchange
• Color change in solutions

Answer explanation

The Tyndall effect is the scattering of light by particles in colloids.

A solution that holds more than the maximum amount of solute at a given temp is:

• Saturated
• Unsaturated
• Supersaturated
• Diluted
• Precipitated

Answer explanation

Supersaturated solutions temporarily hold more solute than normally possible.

Fill in the blank: A ______ solution holds the maximum amount of solute possible at a given temperature.

Answer explanation

Saturated solutions contain the maximum amount of solute that can dissolve at that temperature.