States of Matter — Answer Key
Part A: Sort the Words
Sort each word or number into the correct category box.
1. Sort each material as LIQUID or GAS. Liquids flow in a container. Gases fill the whole space, often unseen.
Liquid
waterjuicemilk Gas
steamairballoon gas Water, juice, and milk are liquids that pour. Steam, air, and the gas inside a balloon spread out to fill the space around them.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. Air is a gas that we breathe every day.
Air is a mix of gases that fills the space around us.
2. When water gets very hot, it turns into a gas called steam.
Boiling water changes from a liquid into the gas we call steam.
3. A gas fills the whole space of its container.
Gases spread out until they fill every corner of their container.
4. Juice in a box is a liquid.
Juice flows and takes the shape of the box or cup, so it is a liquid.
5. A balloon gets bigger because gas fills it up inside.
The gas inside a balloon spreads out and pushes on the walls, making it grow.
Part C: True or False?
Read each statement. Circle True or False.
1. Air is matter even though we cannot see it.
True False
True — air is a gas, and gases are real matter that take up space.
2. Steam is a solid you can hold in your hand.
True False
False — steam is a gas, so it spreads out and cannot be held like a solid.
3. A liquid takes the shape of its container.
True False
True — liquids flow and match the inside shape of their container.
4. A gas only fills half of the room it is in.
True False
False — gases spread out to fill the whole space they are in.