Which of the following does not indicate a chemical change? precipitate formation crushing a solid into a powder color change gas evolution

crushing a solid into a powder

Explanation: A physical reaction is defined as the reaction in which a change in shape, size takes place. No new substance gets formed in these reactions.

A chemical reaction is defined as the reaction in which a change in chemical composition takes place. A new substance is formed in these reactions.

Indicators of a chemical change are:

1. Energy is released or absorbed

2. Formation of precipitate

3. Change in color

4. Evolution of gas

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.