Solutions, Acids and Bases Practice Test

During an experiment about the rate of dissolving you test temperature. In one beaker you use room temperature water, one beaker you use hot water and the last beaker you use ice water. In what order would the beakers dissolve the solute from slowest to fastest?

• hot, cold, room temperature.

• cold, hot, room temperature.

• cold, room temperature, hot.

• hot, room temperature, cold.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

In this model how can you tell what is the solute?

• The solute is always a liquid.

• the solute is the material that dissolves.

• The solute can be either substance in the solution.

• The material present in the greatest amount is the solute

In this model what is being changed about the solution?

• There is more solvent being added making it concentrated.

• There is more solute being added making it concentrated.

• There is heat being added to speed up the rate of dissolving.

• There is nothing special about this model.

Tags

NGSS.MS-PS1-2

The picture shows how you might change an variable in an experiment about what affects the rate of dissolving. What results do you expect to see?

• A will dissolve slowest because it has the largest number of particles.

• D will dissolve slowest because it has the smallest surface area.

• All pieces will dissolve at an equal rate.

• C will dissolve slowest because it has the most bonds between sugar molecules.

Tags

NGSS.MS-PS1-2

Look at the solubility curve - as a GENERAL rule (that means there are exceptions, as always, in science) what trend can be states about how temperature affects the solubility of the compounds shown.

• Temperature has NO affect.

• The relationship is inversely proportional - as temperature increases, the solubility decreases.

• The relationship is directly proportional - as temperature increases, the solubility increases.

• It varies - the solubility will increase and then decrease when it reaches a certain temperature.

Tags

NGSS.MS-PS1-4

If you were testing what might affect the rate of dissolving of sugar, you could test the affect of agitation (shaking, stirring, etc). Which of the following BEST explains how this will change how fast the solute will dissolve.

• Stirring the solution exposes the solute to fresh solvent more quickly.

• Stirring helps more solvent evaporate.

• Stirring causes more ions to precipitate out of solution.

• Stirring equalizes the water temperature.

Tags

NGSS.MS-PS3-4

How many grams of KCl will dissolve in 100mL of water at 75^oC?

• 35 grams

• 40 grams

• 45 grams

• 50 grams

Tags

NGSS.HS-PS1-5

Indigestion and heartburn is causes by an over production of stomach acid. If you were suffering from indigestion, what types of foods should you avoid?

• Foods that have a pH BELOW 7.

• Food that have a pH ABOVE 7.

• Food that have a pH of 7.

• Food has no impact on indigestion.

The table shows the pH values of a sample of substances. According to the substances, which is most acidic.

• Stomach acid

• Oven cleaner

• Eggs

• Milk

Tags

NGSS.MS-PS1-2

The table shows the pH of a sample of substances. Which of the basic items would be the best conductor of electricity.

• Stomach acid

• Oven cleaner

• Eggs

• Milk