Bronze is a homogeneous mixture of copper and tin. Mixtures of solid metals are called alloys. Modern bronze is composed of 88% copper and 12% tin.
A physical property is a property that can be observed without changing the identity of the substance that is being observed. Physical properties of bronze include:
- Bronze is a solid at room temperature.
- Bronze is copper-colored.
- Bronze is odorless.
- Bronze has melting point of ~950 degrees C to 1050 degrees C.
- Bronze has a relative density of ~8.8 g/cc.
- Bronze is insoluble in water.
- Bronze is ductile.
- Bronze is a good conductor of heat.
- Bronze is a good conductor of electricity.
- Bronze is harder than copper or iron.
- Bronze has low friction properties.
A chemical property is a property whose observation results in a change in the identity of the substance. Chemical properties of bronze include:
- Bronze can oxidize in air, resulting in a thin film of copper oxide on the surface.
- Bronze can react with many pollutants, especially those containing sulfur compounds.
- Bronze can react with chlorine compounds resulting in the formation of copper chloride, which continues to corrode the bronze. This process is called "bronze disease."
- Bronze resists seawater corrosion.
- Bronze can react with strong acids, producing hydrogen gas.
- Bronze is stable at room temperature.