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 ...

Understanding the differences between physical and chemical changes is the basics in the study of chemistry. These two types of transformations describe how substances can change in terms of their ...

Chemical reactions are described ... Where a perceived change has occurred, discuss why this might be the case, for example through the creation of gases. Repeat reactions that create gas in ...

Chemical reactions are described ... Where a perceived change has occurred, discuss why this might be the case, for example through the creation of gases. Repeat reactions that create gas in ...