Question

Select the true statement:

Answer 1

Answer:

Bonds are broken and new bonds are formed during chemical reactions only.

Explanation:

• A physical change in a substance doesn't change what the substance is.

• In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.

• Physical changes can be reversed, chemical changes cannot be reversed with the substance changed back without extraordinary means, if at all. For example, a cup of water can be frozen when cooled and then can be returned to a liquid form when heated.

So, the right choice is:

Bonds are broken and new bonds are formed during chemical reactions only.