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- 1. Multiple Choice
1. What happens when a solid dissolves in a liquid?
It sinks to the bottom.
It breaks up into tiny particles that you can no longer see.
It floats to the top.
It makes the liquid evaporate more quickly.
- 2. Multiple Choice
What is a solution?
A liquid with another material dissolved in it.
liquid that has solids in it that have sunk.
A solid that has been immersed in water.
It makes the liquid evaporate more quickly.
- 3. Multiple Choice
Pick one correct definition: Solutions are:
coloured and opaque.
colourless and opaque.
coloured and transparent.
either coloured or colourless, and transparent.
- 4. Multiple Choice
Match the substance to how it will react when mixed with water: Sugar:
Dissolve completely.
Mix at first, then separate and sink.
Form a new substance, eventually solidifying.
Mix at first, then separate and float.
- 5. Multiple Choice
Select the two correct statements:
Soluble materials dissolve in liquid, making a solution.
Soluble materials mix with a liquid, but will always separate eventually.
Insoluble materials may be mixed with a liquid, making a mixture.
Insoluble materials dissolve in liquid, making a solution.
- 6. Multiple Choice
True or false: Dissolving is a reversible change. The solid (solute) and liquid (solvent) can be separated.
TRUE
FALSE
- 7. Multiple Choice
How can materials dissolved in water, such as sugar or salt, be separated?
By filtering them through a sieve.
By filtering them through filter paper.
By evaporating the liquid.
By adding dye or food colouring.
- 8. Multiple Choice
How could a mixture of water and soil be separated?
Only by filtration.
Only by evaporation.
By filtration or evaporation.
By removing the soil particles using tweezers.
- 9. Multiple Choice
Which of these are irreversible changes?
Salt dissolved in water.
Plaster of Paris dissolved in water.
Wood that has been burnt.
An egg that has been boiled.
- 10. Multiple Choice
Which of these changes are reversible?
Sand mixed in water.
Rice mixed in sand.
potato that has been baked.
An effervescent tablet (e.g. Alka-Seltzer®) dissolved in water.
- 11. Multiple Choice
Which description best describes what happens when a material is burnt?
The process is reversible.
The process is irreversible: the original material is destroyed to
produce new
The material being burnt disappears.
The material being burnt always turns completely into a
gas.
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