# Lesson Worksheet: Solubility: Solutes and Solvents Science

In this worksheet, we will practice describing the effect the surface area of a solute, the type of solute, and the quantity of a solvent have on the rate of dissolving.

Q1:

We can make a solute dissolve faster in a solvent in a number of ways:

• The surface area of the solute can be .
• The temperature of the solvent can be .
• The amount of solvent can be .
• The rate of stirring can be .

Which of the following completes all the sentences?

• ASped up
• BDecreased
• CKept the same
• DIncreased
• ESlowed down

Q2:

Sugar is a solute, which means it can dissolve in a solvent such as water.

Michael is designing an experiment to investigate how the surface area of a solute affects how quickly it dissolves. He chooses sugar as his solute and water as his solvent.

Here are the steps of Michael’s experiment:

1. Measure 100 mL of water into each beaker.
2. Add a sugar cube to beaker 1, timing how long it takes to dissolve.
3. Add a crushed sugar cube to beaker 2 and stir, timing how long it takes to dissolve.
4. Record and compare the results.

Michael’s experiment is not a fair test. What did he do wrong?

• AHe used the same volume of water in each beaker.
• BHe crushed one sugar cube and not the other.
• CHe used the same temperature of water in each beaker.
• DHe stirred the contents of one beaker and not those of the other.

Q3:

Table salt is a solute that dissolves in water.

By what other name is table salt known?

• ASodium chloride
• BSodium carbonate
• CSodium bicarbonate
• DNone of the answers are correct.

Q4:

Jacob is investigating if the surface area of a solute such as sugar affects how quickly it dissolves.

To make his test fair, he uses the same

• amount of water,
• temperature of water,
• rate of stirring,
• amount of sugar.

Here are the results of his experiment.

Form Time Taken to Dissolve Sugar cube Granulated sugar 30 seconds 20 seconds

Which form of sugar has the larger surface area?

• AGranulated sugar
• BSugar cube

Fill in the blanks: Jacob concludes that the the surface area of a solute is, the the solute dissolves.

• Asmaller, faster
• Blarger, slower
• Clarger, faster

Q5:

Emma is investigating whether some solutes dissolve quicker than others. She predicts that sodium chloride and sodium carbonate have the same rate of dissolving.

To make her test fair, she keeps each of these the same:

• volume of water,
• temperature of water,
• rate of stirring,
• mass of solute.

Here is a graph of her results.

Do the results support her prediction?

• AYes
• BNo

Which solute dissolves faster?

• ASodium chloride
• BSodium carbonate

Q6:

True or False: The type of solute does not affect the rate of dissolving if added to the same amount of solvent and at the same temperature of the solvent.

• ATrue
• BFalse

Q7:

Which of the following is true about a solute?

• AIt is the substance that dissolves in a solvent.
• BThe surface area of a solute affects the rate of dissolving.
• CThe type of solute affects the rate of dissolving.
• DAll of the answers are correct.

Q8:

Which of the following affects the rate of dissolving?

• AThe surface area of the solute
• BThe amount of solvent
• CBoth answers are correct.

Q9:

Fill in the blanks: In a water–salt solution, the water is the , while the table salt is the .

• Asolvent, solute
• Bsolute, solvent

Q10:

In a water–sugar solution, what is the solute?

• AWater
• BSugar

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