Development of the atomic model

Major phases in the history of theories and views about the structure of the atom.

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Chain reaction

Energy released during nuclear fission can be used for civilian or military purposes.

Exothermic reaction

When heated, powdered sulphur reacts with powdered zinc, releasing heat.

Exothermic reaction (observation)

When heated, powdered sulphur reacts with powdered zinc, releasing heat.

Fuel cell

A fuel cell provides environment-friendly electric energy produced by the chemical...

Reaction of hydrogen with oxygen

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

Fiery orange peel

When the essential oil from the peel touches the candle flame, it burns and creates a ball of fire.

The surface tension of liquids

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

Phase transitions

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

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