Explains chemical changes, which occur when two or more materials combine to form new substances. It describes various examples of chemical changes, such as burning wood, digestion, and ...

Instead, the atoms rearrange themselves to form new chemicals. This is known as a chemical change. The other kind of change in chemistry is a physical change, which is when a substance changes ...

There are three core practical activities in the Chemical changes section: investigate the change in pH on adding powdered calcium hydroxide or calcium oxide to a fixed volume of dilute ...