CHEM1001 Lecture 11: Chem 11
Document Summary
There are two types of change in matter: physical change and chemical change. As the names suggest, a physical change affects a substance"s physical properties, and a chemical change affects its chemical properties. Many physical changes are reversible, whereas chemical changes are often irreversible or only reversible with an additional chemical change. Another way to think about this is that a physical change does not cause a substance to become a fundamentally different substance but a chemical change causes a substance to change into something chemically new. Blending a smoothie, for example, involves two physical changes: the change in shape of each fruit and the mixing together of many different pieces of fruit. Because none of the chemicals in the smoothie components are changed during blending, we know that no chemical changes are involved. Blending a smoothie involves physical changes but no chemical changes.
