purity and formulations

• Melting and boiling point data can be used to determine if a substance is pure.
• A pure substance is not mixed with any other substance.
• A pure substance melts at a specific fixed temperature and a pure substance also has a specific fixed boiling point.
• In pure substances, melting and boiling occur over a range of temperatures.
• If a substance is heated, its melting and boiling points can be measured to determine if it's pure.
• The melting point of a pure substance is fixed at a specific temperature.
• The boiling point of a pure substance is also fixed at a specific temperature.
• A formulation is a complex mixture that's been designed as a useful product, with the quantity of each component carefully measured to give the product the properties we need.