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-fluoride (HF)

One of the hydrogen halides, a highly aggressive substance - it even attacks glass.

Physical and chemical changes The reaction between iron and sulphur

When two substances are heated, they combine to form a compound.

Body-centred cubic lattice

The least tightly packed crystal structure.

Nitrogen (N₂) (basic)

A colourless, odourless, non-reactive gas, it constitutes 78.1% of Earth´s atmosphere.

Calcium carbonate (CaCO₃)

Limestone is a widely and diversely used material.

Sulphate ion (SO₄²⁻)

A compound ion produced when sulphuric acid releases a proton.

Phosphorus pentoxide (P₂O₅)

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

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