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Energetics

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Question 3

Which reaction has a standard enthalpy change equal to the standard enthalpy of formation for magnesium bromide?

A

Mg(s)+Br2(g)→MgBr2(s)\text{Mg(s)} + \text{Br}_2\text{(g)} \rightarrow \text{MgBr}_2\text{(s)}Mg(s)+Br2​(g)→MgBr2​(s)

B

Mg2+(g)+2Br−(g)→MgBr2(s)\text{Mg}^{2+}\text{(g)} + 2\text{Br}^-\text{(g)} \rightarrow \text{MgBr}_2\text{(s)}Mg2+(g)+2Br−(g)→MgBr2​(s)

C

Mg(s)+Br2(l)→MgBr2(s)\text{Mg(s)} + \text{Br}_2\text{(l)} \rightarrow \text{MgBr}_2\text{(s)}Mg(s)+Br2​(l)→MgBr2​(s)

D

Mg(g)+Br2(l)→MgBr2(s)\text{Mg(g)} + \text{Br}_2\text{(l)} \rightarrow \text{MgBr}_2\text{(s)}Mg(g)+Br2​(l)→MgBr2​(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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