Nitrogen-dioxide (NO₂)

A reddish-brown toxic gas, very reactive due to its unpaired electron.

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Boron trifluoride (BF₃)

Colorless, heavier-than-air gas with a pungent odor. It forms white fumes in moist air.

Hydrogen bromide (HBr)

One of the hydrogen halides, it is used for the production of alkyl bromides.

Nitrogen monoxide (Nitric oxide) (NO)

A colorless, heavier-than-air gas, an intermediate in the production of nitric acid.

Physical and chemical changes The reaction between iron and sulphur

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

Sodium chloride (NaCl)

Common salt (or table salt) is one of the most important sodium compounds, indispensable...

Nitrous acid (HNO₂)

One of the oxoacids of nitrogen. Colorless, moderate acid with a pungent odor, that...

The reaction between aluminium and iodine (observation)

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

Nitrate ion (NO₃⁻)

A compound ion, the main source of nitrogen for plants.

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