Chemistry · BGCSE / Rates of reaction
StructuredPast exam questionForm 5 · BGCSE
The equation for the reaction between hydrogen and iodine at 450 °C is: H₂(g) + I₂(g) ⇌ 2HI(g).
- aRe-write the equation showing all the covalent bonds. [2]
- bExplain why the reaction will begin only when the activation energy is supplied. [1]
- cExplain, in terms of bonds broken and formed, why the forward reaction is slightly endothermic. [1]
- dThe reaction reaches a dynamic equilibrium after a while. Explain what is meant by dynamic equilibrium. [1]
- eState the effect of increasing pressure on the position of the equilibrium. [1]
You'll mark your own answer against the marking guide when you hand it in.
Source: BEC BGCSE Chemistry 2004, Paper 3, Question 6(c)
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