NDA Unit 6B: Chemical Thermodynamics & Hess's Law — practice questions

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Unit 6B: Chemical Thermodynamics & Hess's Law questions and exercises with answers

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Plaster of Paris (POP) has the formula:Read the answer and worked solution →

Worked practice questions

Plaster of Paris (POP) has the formula:

CaSO₄·2H₂O
CaSO₄·½H₂O
CaCO₃
Ca(OH)₂

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Correct answer: B. CaSO₄·½H₂O

1. POP is calcium sulphate hemihydrate: CaSO₄·½H₂O. 2. Made by heating gypsum (CaSO₄·2H₂O) to ~100 °C. 3. On adding water it sets to gypsum, useful for casts/moulds. _Source: syllabus Science Ch 2 §2.4.4 Plaster of Paris_

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