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Mixtures and solutions Quiz for Grade 7

10 science questions on mixtures and solutions with answers, written for Grade 7. Use it as it is, change any question, print it with an answer key, or give it online and let it grade itself.

1.
Which of the following is a characteristic of a solution? (Multiple choice)
  1. It is a homogeneous mixture
  2. It can be separated by filtration
  3. It always contains solids
  4. It has particles that settle over time
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It is a homogeneous mixture

A solution is a homogeneous mixture with particles evenly distributed.
2.
What is the solvent in a saltwater solution? (Multiple choice)
  1. Air
  2. Salt
  3. Sugar
  4. Water
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Water

The solvent is the substance that dissolves the solute, which is water in saltwater.
3.
Which method is best to separate a mixture of sand and water? (Multiple choice)
  1. Magnetism
  2. Filtration
  3. Evaporation
  4. Distillation
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Filtration

Filtration separates solids like sand from liquids like water.
4.
What happens to the particles of a solute when it dissolves in a solvent? (Multiple choice)
  1. They combine to form a new substance
  2. They spread evenly throughout the solvent
  3. They settle at the bottom
  4. They evaporate
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They spread evenly throughout the solvent

Dissolving means the solute particles disperse evenly in the solvent.
5.
True or False: A mixture can be separated by physical means. (True or false)
  1. True
  2. False
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True

Mixtures can be separated by physical methods like filtration or evaporation.
6.
True or False: Solutions always appear cloudy because the particles are large. (True or false)
  1. True
  2. False
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False

Solutions are clear because the particles are very small and evenly distributed.
7.
Name the process used to separate a liquid from a dissolved solid by heating. (Identification)
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Evaporation

Evaporation removes the liquid, leaving the solid behind.
8.
The substance that gets dissolved in a solution is called the _____ . (Fill in the blank)
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solute

The solute is the substance dissolved in the solvent.
9.
Match each term with its correct description. (Matching type)
1. Solvent
A. Mixture with particles that do not settle but scatter light
2. Solute
B. Substance that dissolves the solute
3. Suspension
C. Substance dissolved in the solvent
4. Colloid
D. Mixture where particles settle over time
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1 = Substance that dissolves the solute; 2 = Substance dissolved in the solvent; 3 = Mixture where particles settle over time; 4 = Mixture with particles that do not settle but scatter light

These terms describe different parts and types of mixtures.
10.
List three methods used to separate mixtures. (Enumeration)
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Filtration, Evaporation, Distillation

These are common physical methods to separate mixtures.