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Energetics

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Question 11

A student carries out an experiment to investigate the temperature change of water when a sample of ammonium nitrate dissolves in it.

The student obtains the following results:

  • mass of water (mmm) = 60 g
  • mass of ammonium nitrate added = 8.0 g
  • starting temperature of the water = 22.5∘C22.5^\circ\text{C}22.5∘C
  • final temperature of the solution = 13.5∘C13.5^\circ\text{C}13.5∘C
a.

Explain whether the dissolving of ammonium nitrate is exothermic or endothermic.

[2]
b.

Calculate the heat energy change (QQQ), in joules, using the expression:

Q=m×4.2×ΔT Q = m \times 4.2 \times \Delta T Q=m×4.2×ΔT

where ΔT \Delta T\,ΔT is the temperature change.

[3]
Markscheme

Energetics Questions

  1. IGCSE
  2. /Chemistry
  3. /Energetics

35 exam-style questions on Edexcel IGCSE Chemistry Energetics. Each one has a worked solution and a mark scheme showing where the marks go.

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