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Water Changes State
Age 12 · Chemistry
Ice can melt into liquid water, and liquid water can boil into steam. Steam can cool back into liquid water; the amount of matter stays the same, and the temperature stays steady while a pure substance changes state.
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In the picture
- Thermometer in melting ice: the red line stays level with one mark
- Kettle spout: steam rises as liquid water turns into gas
- Cold glass surface: droplets form as steam turns back into liquid
- Balance pointer: centred between two equal pans, one holding ice and one holding water
Examples
- Ice cubes melting in a cold drink
- Steam from a kettle condensing on a cold window
Key takeaways
- During a change of state, the mass stays the same
- For a pure substance, the temperature stays constant while it changes state
Quiz: Water Changes State (Age 12)
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During a change of state, what happens to the temperature of a pure substance?
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During a change of state, what happens to the mass?
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When steam cools on a cold surface, what does it turn back into?
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