Which of these is an example of a chemical change? deflating a rubber balloon combining rubber with sulfur stretching an elastic rubber band erasing pencil marks from a page

combining rubber with sulphur

Explanation:

Chemical change is the change in which chemical composition of the substance changes by rearrangement of atoms.

Physical change is a change in which only the physical properties such as size, shape etc change and there is no rearrangement of atoms.

1. Deflating a rubber balloon only decreases the size of balloon and hence is a physical change.

2. Combining rubber with sulphur is vulcanisation in which sulphur forms bonds with rubber and thus is a chemical change.

3. Stretching an elastic rubber band only changes the shape and hence is a physical change.

4. Erasing pencil marks from a page does not involve any rearrangement of atoms and thus is a physical change.

the answer is c. nacl