Changing states of matter interactive worksheet - Free Printable

Let's solve this step by step.

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Word Bank:

- solid
- liquid
- gas
- melt
- freeze
- condensation
- heat
- evaporation

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Fill in the blanks:

1. The state of matter where the molecules are far apart and move around freely is called a
→ gas
*(Gas molecules have high kinetic energy, are far apart, and move freely.)*

2. The state of matter where the molecules are tightly packed together and do not move is called a
→ solid
*(In solids, particles are closely packed and vibrate in place.)*

3. The state of matter where the molecules move around a little bit, and it takes the shape of its container is called a
→ liquid
*(Liquids flow and take the shape of their container; molecules are close but can slide past each other.)*

4. To make matter change states, you need to add or take away
→ heat
*(Heat energy causes particles to move faster or slower, leading to phase changes.)*

5. When you add heat to a solid it will ________ into a liquid.
→ melt
*(Melting is the process of changing from solid to liquid.)*

6. When you take away heat from a liquid it will ________ into a solid.
→ freeze
*(Freezing is the process of changing from liquid to solid.)*

7. When you add heat to a liquid it will turn into a gas; this is called
→ evaporation
*(Evaporation is when a liquid turns into a gas, especially at the surface.)*

8. When you take away heat from a gas, it will cause liquid to form; this is called
→ condensation
*(Condensation is the change from gas to liquid, like dew forming on grass.)*

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Examples of Each Type of Matter Change in Everyday Life:

| SOLID TO LIQUID | LIQUID TO GAS | GAS TO LIQUID | LIQUID TO SOLID |
|---------------------|-------------------|-------------------|---------------------|
| Ice melting into water (e.g., ice cubes in a drink) | Water boiling and turning into steam (e.g., cooking pasta) | Water vapor condensing on a cold glass (e.g., fog on a mirror) | Water freezing into ice (e.g., making ice cubes in the freezer) |

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✔ Final Answers:

1. gas
2. solid
3. liquid
4. heat
5. melt
6. freeze
7. evaporation
8. condensation

And examples:
- Solid to liquid: Ice melting in your hand
- Liquid to gas: Water evaporating from a puddle
- Gas to liquid: Morning dew forming on grass
- Liquid to solid: Water freezing in a freezer

This worksheet helps reinforce understanding of the states of matter and how they change with temperature and energy transfer.