Factors Influencing Dissolution Rates

How does increasing the temperature of a solvent affect the rate of dissolution of a solid solute?

• It decreases the rate of dissolution.

• It has no effect on the rate of dissolution.

• It increases the rate of dissolution.

• It causes the solute to precipitate.

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TEKS.SCI.7.6E

A student is dissolving sugar cubes in water. How would breaking the sugar cubes into smaller pieces affect the rate of dissolution?

• It would decrease the rate of dissolution.

• It would have no effect on the rate of dissolution.

• It would increase the rate of dissolution.

• It would cause the sugar to crystallize.

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Which of the following best explains why stirring a solution increases the rate of dissolution?

• Stirring decreases the temperature of the solution.

• Stirring increases the surface area of the solute.

• Stirring increases the interaction between solute and solvent particles.

• Stirring decreases the solubility of the solute.

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Compare the rate of dissolution of table salt and sugar in water. Which factor is most likely to cause a difference in their rates of dissolution?

• The molecular weight of the solutes.

• The temperature of the water.

• The surface area of the solutes.

• The type of chemical bonds in the solutes.

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Calculate the rate of dissolution if 10 grams of a solute dissolves in 200 mL of water in 5 minutes. Express your answer in grams per minute.

• 0.5 grams per minute

• 2 grams per minute

• 1 gram per minute

• 0.2 grams per minute

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In a real-world scenario, why is it important to understand the rate of dissolution when designing a medication in tablet form?

• To ensure the tablet is easy to swallow.

• To control the release and absorption rate of the medication in the body.

• To make the tablet more colorful.

• To reduce the cost of production.

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A student observes that powdered sugar dissolves faster than granulated sugar in water. Which factor is primarily responsible for this observation?

• Temperature of the water

• Surface area of the sugar

• Amount of water used

• Type of sugar used

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If a solute dissolves faster in hot water than in cold water, what can be inferred about the effect of temperature on the dissolution process?

• Temperature has no effect on dissolution.

• Higher temperatures decrease the rate of dissolution.

• Higher temperatures increase the rate of dissolution.

• Temperature only affects gaseous solutes.

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Why might a chemist choose to use a powdered form of a solute rather than a solid block when preparing a solution?

• To decrease the solubility of the solute.

• To increase the rate of dissolution.

• To make the solution more colorful.

• To reduce the temperature of the solution.

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In what way does agitation affect the dissolution rate of a solute in a solvent?

• It decreases the temperature of the solution.

• It increases the solubility of the solute.

• It increases the contact between solute and solvent particles.

• It decreases the surface area of the solute.

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DOK Level 3: Strategic Thinking

TEKS.SCI.7.6E