Post on 18-Jul-2015
metal + oxygen ---- metal oxide.
metal + water --- metal hydroxide + hydrogen.
The gas that reacts with metals mostly is oxygen.
When Metals react with the gas which is given off is called hydrogen.
metal + sulphuric acid --- metal sulphate + hydrogen.
Aluminium does not need to be painted because it forms a natural protective layer.
When a copper coin goes black and dull oxidation and tarnishing take place.
Gold does not react with the air.
To break bonds electricity is used.
Attaching a copper rod to iron would not reduce the corrosion rate.
When iron corrodes it reacts with chemicals in the environment to form compounds.