CH-620
States of matter
Chemistry · Secondary 3 · Easy · States of matter
A student heats a pure solid from −10 °C to 80 °C. The temperature stays constant at 20 °C for several minutes before rising again. What is happening to the solid at 20 °C?
- The solid is cooling down.
- The solid is melting to form a liquid.
- The liquid is boiling to form a gas.
- The liquid is freezing to form a solid.
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