Asubstance has a melting point of 80 °c. which of the following is true for the substance?
-when the substance is heated, its temperature will rise above 80 °c after 50% of the liquid has changed to vapors.
-when the substance is heated, its temperature will rise above 80 °c after 100% of the liquid has changed to vapors.
- when the substance is cooled, its temperature will fall below 80 °c after 50% of the liquid has changed to solid.
-when the substance is cooled, its temperature will fall below 80 °c after 100% of the liquid has changed to solid.

When the substance is cooled, its temperature will fall below 80 °C after 100% of the liquid has changed to solid.

Explanation:

Melting point is the temperature at which a solid changes state to liquid. At the melting point, the phase of matter changes from solid state to a liquid flowing state.

If after a substance is cooled, without reaching its melting point, it will still remain as a liquid. Below the melting point the substance will freeze back to its solid state.

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