Question

25.852 g of a substance occupies 6.31 cm3 express its density by keeping the significant figures in view

Answer 1

Explanation:

Density ρ=M/V=5.74/1.2=4.78333g/cm

3

As voulme has least two significant figures so the answer must be expressed in two singnificant figures.

Thus density will be 4.8g/cm

3

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Answer 2

$\huge{Answer}$

These are known as characteristics of a chemical reaction. Let's perform an activity to understand. Take zinc granules in a conical flask and add hydrochloric acid to it and observe. We see that the mixture produces zinc chloride and the temperature of the conical flask is increasing.