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Phase transitions

A phase transition is the transformation of a substance from one state of matter to another.

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Reaction of hydrogen with oxygen

Knallgas is the mixture of hydrogen and oxygen. It will explode when ignited.

The effect of temperature on chemical equilibrium (observation)

Change in the colour of the cobalt(II) chloride solution due to heating and cooling.

Structure of nitrogen molecules

This animation demonstrates the structure of nitrogen molecules, with one sigma and two...

The effect of concentration on chemical equilibrium (observation)

Examining the colour of cobalt(II) chloride in water and hydrochloric acid.

Molecule exercises I (Bonds)

An exercise about different types of bonds.

The surface tension of liquids

We observe whether a razor blade can float on the surface of different liquids.

The surface tension of liquids (observation)

We observe whether a razor blade can float on the surface of different liquids.

Endothermic reaction

Barium hydroxide reacts with ammonium nitrate while absorbing heat from their surroundings.

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