List the observations that helps us to determine when a chemical reaction has taken place.

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Solution

The observation that helps to determine whether a chemical reaction has taken place or not are:

1. Change in state and colour.

2. Evolution of a gas

3. Change in temperature.

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List the observations that helps us to determine when a chemical reaction has taken place.

List the observations that helps us to determine when a chemical reaction has taken place. [3 MARKS]

Which of the following observations help us to determine whether a chemical reaction has taken place or not?

(i) Change in state.

(ii) Change in colour.

(iii) Change in shape

(iv) Evolution of gas.

(v) Change in temperature.

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