Wich of these is not a sign of chemical change 1 A gas is given off

2 the material dissolves.

3 a color change occurs.

2. The material dissolves

Explanation:

The Question tests the understanding of chemical change and whether we know the signs that show its occurrence.

First we need to know what is chemical change;

Chemical change is a type of change that involves formation of a new substance different from the original substance.

Second we need to identify the signs that indicate the occurrence of a chemical change

Chemical change in chemical reactions is characterized by various signs which include; Production of bubbles Color change Formation of a precipitate Change of odor Change in temperature. Therefore, in this case, the material dissolving is not a sign that chemical change has taken place.