Hydrogen (H₂)

Colourless, odourless, lighter-than-air gas. The most common chemical element in the universe.

Ammonium ion (NH₄⁺)

A compound ion generated when a proton is added to an ammonia molecule.

Pentane (C₅H₁₂)

The fifth member in the alkane homologous series. A colourless, combustible liquid.

Hydrogen chloride (HCl)

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

Trans-2-butene (C₄H₈)

A colourless, heavier-than-air gas. Its geometric isomer is cis-2-butene.

Ethanol (ethyl alcohol) (C₂H₅OH)

The best known alcohol, important in the food industry.

Nitrate ion (NO₃⁻)

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

Ethane (C₂H₆)

The second member in the homologous series of straight-chain alkanes.

Silver nitrate (AgNO₃)

One of the raw materials of traditional photography.

Phosphate ion (PO₄³⁻)

A compound ion formed when a phosphoric acid molecule releases a proton.

Glycylglycine (C₄H₈N₂O₃)

The simplest peptide, formed from two glycine molecules by a peptide bond.

Glycerol (propane-1,2,3-triol) (C₃H₈O₃)

A triol that is often used as an ingredient of creams and ointments.

Boron trifluoride (BF₃)

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

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