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Energetics

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Question 4

Which reaction has an enthalpy change equal to the standard enthalpy of formation of sodium bromide, NaBr(s)\text{NaBr(s)}NaBr(s)?

A

Na(g)+12Br2(g)→NaBr(s)\text{Na(g)} + \frac{1}{2}\text{Br}_2\text{(g)} \rightarrow \text{NaBr(s)}Na(g)+21​Br2​(g)→NaBr(s)

B

Na(s)+12Br2(l)→NaBr(s)\text{Na(s)} + \frac{1}{2}\text{Br}_2\text{(l)} \rightarrow \text{NaBr(s)}Na(s)+21​Br2​(l)→NaBr(s)

C

Na+(g)+Br−(g)→NaBr(s)\text{Na}^+\text{(g)} + \text{Br}^-\text{(g)} \rightarrow \text{NaBr(s)}Na+(g)+Br−(g)→NaBr(s)

D

Na+(aq)+Br−(aq)→NaBr(s)\text{Na}^+\text{(aq)} + \text{Br}^-\text{(aq)} \rightarrow \text{NaBr(s)}Na+(aq)+Br−(aq)→NaBr(s)

Markscheme

Energetics Questions

  1. A Level
  2. /Chemistry
  3. /Energetics

34 exam-style questions on AQA A Level Chemistry Energetics, covering Enthalpy change, Calorimetry, Applications of Hess's law, and Bond enthalpies. Each one has a worked solution and a mark scheme showing where the marks go.

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