Question

Write an example of a chance of where a gas is evolved. Is it a chemical change or a physical change?

Answer 1

Answer:

The formation of a gas is a clue to chemical changes. The bubbles of gas that you observed form when an antacid is dropped into water is an example of change. Another clue that a chemical change has occurred is the formation of a solid.

Explanation:

Answer 2

when warm water is poured over pottasium then the pottasium metal with super reactivity reacts and hydrogen gas is evolved. in this process due to heat the hydrogen gas is evaporated. this is a chemical change.