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 lower 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 the same 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.

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

• Stir the solution, increase the temperature, and crush the CuSO4 into smaller pieces.

• Add more CuSO4, decrease the temperature, and leave the solution undisturbed.

• Use cold water, add impurities, and keep the solution still.

• Reduce the surface area of CuSO4, use less solvent, and avoid stirring.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Describe two ways to increase the concentration of the solution in the picture. Select 2 answers.

• Adding more solvent to the solution

• Adding more solute to the solution

• Evaporating some of the solvent

• Mixing the solution thoroughly

Identify the solvent in this solution.

• The solvent are the solid particles to the solution.

• The solvent is the entire solution including the solute particles.

• There is no solvent in the is this aqueous solution.

• The solvent is the liquid part of the solution. since its probably water.

Which action should not be taken because it would decrease the concentration of the solution?

• Adding more solvent to the solution

• Adding more solute to the solution

• Evaporating some of the solvent

• Mixing the solution thoroughly

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

Which words best complete the sentence?

• dilution

• solute
• concentration
• solvent
• solution
• saturated
• temperature
• agitate
• surface area