Multiple choice

What is the scientific name of Plaster of Paris?

  1. Calcium bicarbonate

  2. Calcium carbonate

  3. Calcium chloride

  4. Calcium sulphate hemihydrate
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Plaster of Paris is calcium sulphate hemihydrate (CaSO4·0.5H2O), a white powder that forms a hard paste when mixed with water and then dries. It's called 'Plaster of Paris' because gypsum, the main source material, was abundantly available near Paris.

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