Question

Fill in the blank spaces by choosing the correct words from the words given in list.

List: composition, heat, chemical, photosynthesis, physical

Heating of zinc oxide is a ……………. change.

Answer 1

• Zinc oxide is a white powder, heating it causes physical changes, and the loss of oxygen causes a reversible chemical change, resulting in oxidation.
• Because the heated zinc oxide absorbs some of the light's blue wavelengths, the reflected light becomes more yellow. In addition, a very little quantity of oxygen evaporates from the lattice when it is heated to high temperatures. As a result, it is a chemical alteration that may be reversed.
• Therefore, Heating of zinc oxide is a physical change.