CH-532
Purity and melting point
Chemistry · Secondary 3 · Medium · Purity and melting point
A student heats a pure solid substance. Its temperature rises from 30 °C to 80 °C, stays constant at 80 °C for a while, then rises again. What is happening to the substance while the temperature remains constant at 80 °C?
- The solid is cooling down.
- The solid is melting at its melting point.
- The liquid is boiling at its boiling point.
- The gas is condensing to a liquid.
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