CH-570
States of matter
Chemistry · Secondary 3 · Medium · States of matter
A sample of nitrogen dioxide gas is cooled until it becomes a yellow liquid and then pale yellow crystals. Which statement about the particles best explains why the temperature stays constant while the liquid is changing to crystals?
- Particles stop moving completely so temperature cannot change.
- Particles move faster but the thermometer is not sensitive enough.
- Energy is used to form stronger forces between particles instead of increasing their speed.
- Particles are already in a fixed position before freezing starts.
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