Science: Mixtures and Solutions Worksheet

Question 1

A student stirs table salt into a glass of water until the salt can no longer be seen. Is this mixture a solution? Explain why.

Accepted Answer

Yes, this mixture is a solution because the salt dissolves evenly in the water and forms a uniform mixture.

Question 2

In a cup of hot cocoa made from cocoa powder and water, the cocoa powder does not fully dissolve and some settles at the bottom. Is this a solution or not? Explain your answer.

Accepted Answer

This is not a true solution because the cocoa powder does not dissolve completely and the mixture is not uniform throughout.

Question 3

In salt water, identify the solute and the solvent.

Accepted Answer

In salt water, the salt is the solute because it is the substance being dissolved, and the water is the solvent because it does the dissolving.

Question 4

A trail mix contains raisins, peanuts, and chocolate chips. Is trail mix a homogeneous mixture or a heterogeneous mixture? Explain how you know.

Accepted Answer

Trail mix is a heterogeneous mixture because its different parts can be seen separately and are not evenly mixed throughout.

Question 5

Describe one way to separate sand from water. Explain why that method works.

Accepted Answer

One way to separate sand from water is filtration. This works because the sand particles are too large to pass through the filter, while the water can flow through.

Question 6

Sugar is stirred into warm tea until it disappears. What evidence suggests that a solution has formed?

Accepted Answer

The evidence is that the sugar is no longer visible and the tea looks the same throughout, which shows that the sugar dissolved evenly in the liquid.

Question 7

A student mixes oil and water in a beaker. After a few minutes, two layers form. What does this show about the mixture?

Accepted Answer

This shows that oil and water do not form a solution and instead make a heterogeneous mixture because they separate into visible layers.

Question 8

If more and more salt is added to water until no more salt dissolves, what is this type of solution called?

Accepted Answer

This type of solution is called a saturated solution because it contains as much dissolved solute as the solvent can hold at that temperature.

Question 9

Explain how evaporation can be used to separate dissolved salt from salt water.

Accepted Answer

Evaporation can separate dissolved salt from salt water because the water changes into vapor and leaves the container, while the salt remains behind as a solid.

Question 10

Air is made of several gases mixed evenly together. Is air best described as a solution, a homogeneous mixture, or a heterogeneous mixture? Explain.

Accepted Answer

Air is best described as a homogeneous mixture, and it can also be considered a solution of gases, because the different gases are evenly mixed throughout.

Question 11

A student says, "All mixtures are solutions." Is this statement correct? Explain why or why not.

Accepted Answer

This statement is not correct because all solutions are mixtures, but not all mixtures are solutions. Some mixtures are not uniform and their parts do not dissolve evenly.

Question 12

Give one example of a solution and one example of a heterogeneous mixture from everyday life. Explain the difference between them.

Accepted Answer

One example of a solution is lemonade with sugar dissolved in it. One example of a heterogeneous mixture is cereal in milk. The difference is that a solution is evenly mixed throughout, while a heterogeneous mixture has visibly different parts.

Science: Mixtures and Solutions

Science: Mixtures and Solutions

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