CH-597
States of matter
Chemistry · Secondary 3 · Hard · States of matter
A liquid is heated from −10 °C to 90 °C. Its temperature stays constant at 20 °C for some time before rising again. Which statement explains what happens to the particles during the flat part at 20 °C?
- Particles move slower so the temperature cannot rise.
- Particles gain kinetic energy and move faster in the solid.
- Particles absorb energy to overcome forces of attraction between them.
- Particles lose energy and become more strongly attracted to each other.
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