Iodine crystal

A solid, grey substance which sublimates when heated. Its solution in alcohol is called ´tincture of iodine´, it is a disinfectant.

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Hydrogen chloride (HCl)

A colourless gas with a pungent odour, its solution in water is called hydrochloric acid.

Comparison of hydrogen halides

Atoms within hydrogen halides are bound by covalent bonds, forming polar molecules.

Silver chloride (AgCl)

A white, crystalline compound that breaks down when affected by light.

The reaction between aluminium and iodine (observation)

Catalysed by a few drops of water, aluminium reacts with iodine.

Phosphorus pentoxide (P₂O₅)

A compound formed as white smoke during the combustion of phosphorus.

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