Phosphate ion (PO₄³⁻)

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

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Physical and chemical changes The reaction between iron and sulphur

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

Nitrate ion (NO₃⁻)

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

Carbon dioxide (CO₂) (beginner)

Colourless, odourless, heavier-than-air gas. Necessary for the photosynthesis of plants.

Nitrous acid (HNO₂)

One of the oxoacids of nitrogen. Colourless, moderate acid with a pungent odour, that...

Flower indicator

Purple and wine red flowers can be used as pH indicators.

Oxygen (O₂) (intermediate)

A colourless, odourless gas, an important component of the atmosphere, indispensable to...

White phosphorus (P₄)

One of the allotropes of phosphorus.

Chlorine (Cl₂)

A yellow-green toxic gas with a strong odour, one of the halogens.

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