Homemade firefighting foam

We can produce carbon dioxide gas using sodium hydrogen carbonate and acetic acid. The carbon dioxide puts out the flame.

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Peeling an egg

The acid in vinegar dissolves materials containing calcium carbonate like eggshell and snail shell.

The effect of pressure change on chemical equilibrium (observation)

Examination of dissolved carbon dioxide in a bottle of carbonated water.

Bending a jet of water

A surprising phenomenon occurs when we hold a statically charged ruler near water flowing from a...

Mixing substances, separating mixtures 1 (observation)

The method of separation of substances in a mixture depends on their different properties.

The effect of concentration on chemical equilibrium (observation)

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

Like dissolves like (observation)

Non-polar substances dissolve in non-polar solvents while polar substances dissolve in polar...

Conformations of ethane

The staggered conformation of ethane is more stable than the eclipsed conformation.

Development of the atomic model

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

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