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 ...

An example of a chemical change is oxidation, which triggers various chemical reactions. Chemical changes are typically irreversible unless further chemical reactions occur. Examples include dye ...

There are three required practicals in the Chemical Changes section: required practical 1 – preparation of a pure, dry sample of a soluble salt from an insoluble oxide or carbonate required ...