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Question 5

  1. How do you define a chemical change?

  2. Give two or three examples of chemical change.

  3. Choose the correct characteristic(s) about the chemical change from the following

Characteristic 1: chemical changes are irreversible

Characteristic 2: new substances are formed.

Characteristic 3: properties of new substances are the same as the properties of original substances.


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Solution

  1. The change in which the composition of the substance changes leading to the formation of new substances is called a chemical change.

  2. Examples of chemical changes: burning of candle wax and burning of wood, etc.

  3. Characteristics 1 and 2 are correct. During a chemical change, the properties of new substances are different from the properties of the original substances. Therefore, characteristic 3 is wrong.


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