Calcium carbonate (CaCO₃)
Limestone is a widely and diversely used material.
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A compound ion produced from carbonic acid by releasing protons.
Pearls, often used as gemstones, are the by-products of certain molluscs' protective mechanisms.
The simplest of the aromatic carboxylic acids.
Colourless, odourless, heavier-than-air gas. Necessary for the photosynthesis of plants.
Colourless, odourless gas, highly toxic to humans and animals in high concentration.
Colourless, odourless liquid produced by dissolving carbon dioxide in water.
In benzene there are sigma bonds and delocalised pi bonds between carbon atoms.
This animation shows the electron configuration of the calcium atom.
An exercise about compound ions.