What are some examples of chemical reactions?
A chemical reaction is when new substances are formed. Substances that react together are called reactants; and the substances formed are called products. Some examples of chemical reactions are combustion (burning), precipitation, decomposition and electrolysis.
An example of combustion is methane + oxygen forms carbon dioxide and water. This can be written as a balanced symbol equation:
An example of precipitation is:
carbon dioxide + calcium hydroxide forms calcium carbonate + water
- calcium carbonate is an insoluble solid, i.e. the precipitate
another example of precipitation is:
lead nitrate + potassium iodide forms potassium nitrate + lead iodide
- in this example lead iodide is the precipitate.