7th Properties of Solutions and Mixtures

Front

The main substance in a solution that dissolves other substances.

Back

solvent

Front

Any substance that gets dissolved in a solution.

Back

solute

Front

A type of mixture where the substances are evenly mixed together.

Back

solution

Front

The amount of a solute in a given amount of a solution.

Back

Concentration

Front

When you lower the concentration of a solution by adding more solvent.

Back

Dilution

Front

Why does the rate of dissolving increase as the temperature increases?

Back

The solute molecules move faster at higher temperatures

Front

How does agitation help in dissolving a solute more quickly?

Back

It brings fresh solvent into contact with undissolved solid

Front

What combination would dissolve a solid solute the fastest?

Back

high temperature, stirring

Front

How does cold water affect the speed of dissolving?

Back

Cold water slows down dissolving.

Front

Why do smaller pieces dissolve faster?

Back

Because they have larger surface area

Answer explanation

Smaller pieces dissolve faster because they have a larger surface area. This allows more solvent molecules to come into contact with the solute, increasing the rate of dissolution. The other options are not correct because they do not affect the surface area. The question asks why smaller pieces dissolve faster, not about the amount of solute, solvent, or temperature. Therefore, the correct explanation is that smaller pieces have a larger surface area.