Solutions Quiz

Which of the following actions will increase the rate of dissolution of a solid solute into an aqueous solution?

• A. Stirring with a spoon

• B. Freezing the solute

• C. Decreasing the temperature

• D. Continuously adding more solute

The image shows two different samples of the same compound, calcium carbonate. There are two beakers full of water. One sample is added to each beaker. Which of the following options correctly compares the rate of dissolution of the samples?

• The calcium carbonate stones will dissolve slowly since they have a greater surface area than the calcium carbonate powder.

• The calcium carbonate stones and calcium carbonate powder will dissolve at the same rate since they have the same surface area.

• The calcium carbonate stones will dissolve quickly since they have a greater surface area than the calcium carbonate powder.

• The calcium carbonate stones will dissolve slowly since they have a lower surface area than the calcium carbonate powder.

Tags

NGSS.MS-PS1-2

You have a solution of saltwater. Which statement best describes what happens when you perform a dilution by adding water?

• The concentration of the solution will increase.

• The concentration of the solution does not change.

• The concentration of the solution will decrease.

• The amount of solute increases.

Copper (II) sulfate, CuSO4, is a bright blue salt with a crystalline structure. Zahara needs to make a CuSO4 solution as quickly as possible for class.

Which three actions should Zahara take to speed up the process of dissolving CuSO₄ in an aqueous solution?

Tags

NGSS.MS-PS1-4

The aqueous solution pictured is too dilute. Which of the following correctly identifies the solvent and explains how to increase the concentration of the solution?

• The solvent is the solute. To increase concentration, add more solvent or remove solute.

• The solvent is water. To increase concentration, add more solute or remove solvent.

• The solvent is water. To increase concentration, add more solvent or remove solute.

• The solvent is the powder. To increase concentration, add more solute or add more solvent.

Tags

NGSS.MS-PS1-2

To increase the (a)   of a solution, a person would dissolve more (b)   into the (c)   .

Which words best complete the sentence?

• dilution

• solute
• solvent

• concentration

• concentration
• solvent