Question

A sample of water boils at 120°C under normal pressure.
1. Is it pure water or impure ? Give Reason .
2. Comment on the state that brings of a candle in words with physical and chemical change.​

Answer 1

1. The water is impure. Pure water boils at 100°C and any impurities present raise the boiling point. Since boiling point of the sample is 120°C the sample is impure.

2. In a candle, the physical change is the wax melting and then solidifieds to form solid wax. The chemical change is the burning of the wick.

Answer 2

1)It is impure water

2) it is physical change becoz burning is physical change .