What reaction occurs when you heat zinc?

At room temperature, zinc is a solid. As you might guess, heating zinc sufficiently will cause it to change state to a liquid as it melts at 419.53 °C, or 787.15 °F. Heated further, it will boil off, as its boiling point is 907 °C, or 1665 °F. If you heat it in air, it will begin to form an oxide film (the oxide of zinc, ZnO) on its surface as it gets hotter.