| As the lens ages, it increases in weight and thickness, and its proteins undergo a chemical change. |
| Many of them are enzymes, molecules that catalyse processes of chemical change. |
| By including the ideas of different kinds of substance and of chemical change from one kind to another, we arrive at chemistry. |
| Physics is the science of the phenomenon of inanimate matter involving no chemical change. |
| When exposed to light, the photoresist undergoes a chemical change that alters its solubility in a certain solvent. |
| When songwriting, he feels he undergoes some sort of chemical change which makes him detached and unresponsive once outside the office. |
