Question

plz solve this worksheet​

Answer 1

Answer:

Answer: Heating zinc oxide is physical changes because zinc oxide is a white powder the loss of oxygen makes it reversible chemical change so the oxidation takes place. Heating zinc oxide a physical or chemical change as well as Zinc oxide is a white powder..

Explanation:

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Answer 2

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1. Heating of zinc oxide is a physical change.

2. Burning of coal is a chemical change.

3. Heat energy is generally given out observed during chemical change.

4. Plants make their food by the process of photosynthesis.

5. There is a change in state and composition during a chemical change.

6. Physical change is a reversible change.

7. Chemical change is a irreversible change.

8. On heating a solid changes into liquid this is called as melting point.

9. The melting point of ice is 0°C.

10. The melting point of tungsten is 3422°C.

11. The process of changing liquid rapidly into a gas on heating is called Vaporization.

12. The boiling point of water is 100°C.

13. The boiling point of acestone is 56°C.

14. The process of changing a gas into liquid on cooling is called condensation.

15. In chemical change specific properties of a substance change completely.