Starter quiz
- Which of the following are in the solid state at room temperature?
- oxygen
- wood ✓
- gold ✓
- orange juice
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- Which of the following is in the liquid state at room temperature?
- cotton
- air
- stone
- milk ✓
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- In the ________ states, materials have a fixed volume.
- solid and liquid ✓
- liquid and gas
- gas and solid
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- In the ______ state, materials keep their shape, except in some cases when a force is applied to them.
- 'solid' ✓
- To heat something is to ________ its temperature.
- decrease
- increase ✓
- measure
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Which of the following describes what happens to a snowman in the sun?- grows
- melts ✓
- freezes
- dissolves
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Exit quiz
- How can we change the state of a solid to a liquid?
- change its colour
- change its temperature ✓
- change its mass
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- How should you change the temperature of a solid to change it into a liquid?
- increase it ✓
- decrease it
-
The process in which a solid changes to a liquid is called ________.- freezing
- melting ✓
- defrosting
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- How can you change materials from their solid state to their liquid state?
- heat them ✓
- cool them
- roll them
- squash them
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How could scientists monitor materials changing from their solid state to their liquid state?- By making conclusions.
- By drawing diagrams.
- By making observations. ✓
- By making predictions.
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At what temperature does water change from a solid state (ice) to a liquid state?- 5°C
- 99°C
- 0°C ✓
- 100°C
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Worksheet
Presentation
Lesson Details
Key learning points
- We can change the state of a solid to a liquid by changing its temperature.
- Water is a solid (ice) at 0°C but becomes a liquid when it is heated.
- The process in which a solid changes to a liquid is called melting.
- Different materials can be observed changing from solid to liquid when heated.
Common misconception
Pupils think that materials can only be heated by being placed on a warm radiator or on a stove or over a candle and don’t think of being “in the room’ as being heated.
Teaching slides and observations show that items which have been stored below room temperature are “being heated” when moved to room temperature. Defrosting is explained in teaching slides.
Keywords
Solid - A solid has a fixed shape and volume but some solids can change shape when a force is applied.
State - Materials can exist in three common states of matter: solid, liquid and gas.
Liquid - A liquid can flow, has a fixed volume and takes the shape of the bottom of the container.
Heat - To heat something is to increase its temperature.
Melt - To melt is to change from a solid state to a liquid state.