Mixtures and Solutions Quiz

Grade 5 · Science · Quiz

Test your knowledge of mixtures, solutions, and how to separate them.

Questions

In a sugar-water solution, what is the solvent?
1. Sugar
2. Water
3. Air
4. The cup
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Answer: Water
Water is the solvent — it's the liquid that dissolves the sugar. Sugar is the solute.
A mixture can always be separated back into its original components using physical methods.
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Answer: True
Mixtures are physically combined (no chemical change), so physical separation methods like filtration, evaporation, magnetism, or hand-picking can separate them.
A mixture where you can see the different parts is called a ___ mixture.
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Answer: heterogeneous
Heterogeneous mixtures have uneven composition — you can see (and often physically separate) the different components.
Which method would best separate iron filings from sand?
1. Filtration
2. Evaporation
3. Using a magnet
4. Distillation
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Answer: Using a magnet
Iron is magnetic; sand is not. Passing a magnet through the mixture pulls out the iron filings, leaving sand behind.
Air is a pure substance with only one type of molecule.
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Answer: False
Air is a homogeneous mixture (solution) of nitrogen (~78%), oxygen (~21%), argon (~0.9%), carbon dioxide (~0.04%), and other gases.
What happens to the salt when water evaporates from salt water?
1. It evaporates with the water
2. It disappears
3. It remains behind as a solid
4. It becomes a gas
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Answer: It remains behind as a solid
Salt has a much higher boiling point than water. When water evaporates as steam, the salt stays behind as a solid — this is how sea salt is produced commercially.
The substance that dissolves in a solution is called the ___.
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Answer: solute
The solute is the dissolved substance. It spreads evenly throughout the solvent to form the solution.
Orange juice with pulp is an example of:
1. A pure substance
2. A solution
3. A heterogeneous mixture
4. A compound
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Answer: A heterogeneous mixture
Orange juice with pulp is heterogeneous — the pulp particles are visible and unevenly distributed. Filtered orange juice (no pulp) would be closer to a homogeneous mixture.
When substances form a solution, a chemical reaction has occurred.
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Answer: False
Dissolving is a physical change, not a chemical one. The salt molecules are still salt molecules after dissolving — they're just surrounded by water molecules and spread out.
Which separation technique is used at water treatment plants to remove solid particles from water?
1. Evaporation
2. Filtration
3. Magnetism
4. Melting
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Answer: Filtration
Water treatment plants use filtration (along with other methods like sedimentation and chlorination) to remove solid particles and contaminants from drinking water.

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