Properties and Changes of Materials

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.

Tags

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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.

Pick one correct definition: Solutions are:

• coloured and opaque.

• colourless and opaque.

• coloured and transparent.

• either coloured or colourless, and transparent.

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.

Tags

NGSS.MS-PS1-2

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.

True or false: Dissolving is a reversible change. The solid (solute) and liquid (solvent) can be separated.

• TRUE

• FALSE

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.

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.

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.

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NGSS.MS-PS1-5

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.