Solids & Liquids — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. Sugar stirred into warm water will dissolve.
Sugar mixes into water so well that we cannot see the grains anymore.
2. Sand dropped in water will not dissolve.
Sand grains stay whole and sink to the bottom instead of mixing in.
3. Salt in water slowly starts to dissolve.
Salt grains break apart in water until the water tastes salty but looks clear.
4. Pepper floats on top and does not mix.
Pepper flakes are light and do not blend in, so they stay on top of the water.
5. Stirring helps sugar dissolve faster in water.
Stirring pushes water past the sugar, which helps it break down into tiny bits.
6. Dirt in water makes the water look cloudy.
Dirt does not dissolve, so tiny bits float around and make the water look dusty.
7. Water that has sugar in it tastes sweet.
Dissolved sugar spreads through the water, so every sip tastes sweet.
8. Sand will sink to the bottom of the glass.
Sand is heavy for its size and does not dissolve, so it rests at the bottom.
9. Salt that mixes into water is still there inside.
Dissolved salt is hiding in the water, which is why the water still tastes salty.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
sugar in warm water
→ dissolves fast
dissolves fast
salt stirred in water
→ dissolves slow
dissolves slow
sand in a glass
→ does not dissolve
does not dissolve
pepper flakes on water
→ floats on top
floats on top
Some solids like sugar and salt dissolve in water, while sand sinks and pepper floats on top.