Iodine crystal

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

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Sulfur dioxide (SO₂)

Sulfur dioxide emission is the main cause of acid rains. It is an intermediate product in...

Hydronium ion (H₃O⁺)

The presence of hydronium ions relative to hydroxide ions determines a solution´s pH.

Dangerous plastic

Environmental organizations are against the use of PVC.

Ozone (O₃)

An allotrope of oxygen, consisting of 3 oxygen atoms.

Phosphate ion (PO₄³⁻)

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

Hypochlorite ion (OCl⁻)

Hypochlorite ions are formed when water is disinfected with chlorine.

Sulfur trioxide (SO₃)

One of the oxides of sulfur, forms sulfuric acid with water.

Physical and chemical changes The reaction between iron and sulphur (observation)

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

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