Texas Science 7.6D and 7.6E - Solutions

What is the solvent in an aqueous solution?

• Salt

• Water

• Sugar

• Carbon dioxide

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DOK Level 1: Recall

Which of the following best describes a homogeneous mixture?

• A mixture where the components are not uniformly distributed

• A mixture where the components are uniformly distributed

• A mixture of solids only

• A mixture of gases only

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DOK Level 1: Recall

Describe the effect of increasing temperature on the rate of dissolution of a solid solute in water.

• It decreases the rate of dissolution

• It has no effect on the rate of dissolution

• It increases the rate of dissolution

• It first increases then decreases the rate of dissolution

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DOK Level 2: Skill/Concept

Explain how surface area affects the rate of dissolution of a solid solute in an aqueous solution.

• Larger surface area decreases the rate of dissolution

• Larger surface area increases the rate of dissolution

• Surface area has no effect on the rate of dissolution

• Smaller surface area increases the rate of dissolution

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DOK Level 2: Skill/Concept

Which of the following is an example of a solute in an aqueous solution?

• Water

• Salt

• Air

• Oil

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DOK Level 1: Recall

How does agitation (stirring) affect the rate of dissolution of a solid solute in water?

• It decreases the rate of dissolution

• It has no effect on the rate of dissolution

• It increases the rate of dissolution

• It first increases then decreases the rate of dissolution

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DOK Level 2: Skill/Concept

Given a solution of saltwater, identify the solute and solvent.

• Solute: Water, Solvent: Salt

• Solute: Salt, Solvent: Water

• Solute: Water, Solvent: Carbon dioxide

• Solute: Carbon dioxide, Solvent: Water

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DOK Level 2: Skill/Concept

Predict what will happen to the rate of dissolution if the temperature of the solvent is decreased.

• The rate of dissolution will increase

• The rate of dissolution will decrease

• The rate of dissolution will remain the same

• The rate of dissolution will first increase then decrease

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DOK Level 3: Strategic Thinking

A student dissolves sugar in water and notices that it dissolves faster when stirred. Explain why this happens.

• 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 surface area of the solute

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DOK Level 3: Strategic Thinking

What is the primary characteristic of a pure substance?

• It contains a mixture of different substances

• It has the same atomic makeup and chemical properties throughout

• It can be separated into different components by physical means

• It is always a solid

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DOK Level 1: Recall