Explain what a pure substance is using an example
A pure substance is a material composed of only one type of particle or molecule. This means that all the particles in a pure substance have the same chemical composition and properties.
An example of a pure substance is pure water. Pure water consists only of water molecules (H2O) and does not contain any other substances or impurities. It has a fixed boiling point of 100 degrees Celsius and a freezing point of 0 degrees Celsius. Its physical and chemical properties are consistent throughout the sample, making it a pure substance.