Which statement correctly describes one of the changes? a) picture i shows a chemical change, because a new substance is formed. b) picture ii shows a chemical change, because a new substance is formed. c) picture i shows a chemical change because the same substance changes form. d) picture ii shows a chemical change, because the same substance changes form.

It'd be A. Picture one shows a chemical change. Rust is made from the iron reacting with oxygen.

Option (A) is the correct answer.

Explanation:

A chemical change is defined as the change which leads to change in chemical composition of a substance.

During a chemical change there occurs formation of a new substance.

For example, in picture 1 when pipes are exposed to air for a few months then color of all the pipes changed. This shows that oxidation has taken place that is, it is a chemical change.

On the other hand, in picture 2 liquid state of water changes into solid state that is, formation of ice takes place. As state of matter is changing and no formation of any new substance occurs so it is a physical change.

Thus, we can conclude that the statement picture I shows a chemical change, because a new substance is formed, correctly describes one of the changes.

wavelength divides in half and speed stays the same.