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

answer: h+ its less than oh

explanation:

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.