Reversible Reactions And Dynamic Equilibrium

Reversible Reactions And Dynamic Equilibrium
Reversible Reactions And Dynamic Equilibrium
Quick questions
1 Give the symbol for a reversible reaction.
2 If the forward reaction of a reversible reaction is exothermic,
what is the energy change in the backwards reaction?
3 Describe what is meant by ‘dynamic equilibrium’.
4 Name the principle that can be used to predict the effect of
changing conditions on the equilibrium position of a reaction.
5 A reversible reaction has an exothermic forward reaction.
Describe what happens to the yield of the products when the
temperature is increased.
6 Describe what happens to the position of equilibrium when the
pressure is reduced for an equilibrium system involving gases.
Exam-style questions
7 Ammonium chloride can thermally decompose to make hydrogen
chloride gas and ammonia. This is a reversible reaction.
7–1 Copy and complete the word equation for this reaction. [1]
 hydrogen chloride
7–2 Write down whether the forward reaction is exothermic or endothermic. [1]
7–3 Define the term ‘reversible reaction’. [1]
Total: 3
8 Hydrated copper(II) sulfate can undergo a reversible reaction.
The following word equation summarises this reaction:
hydrated copper(II) sulfate  anhydrous copper(II) sulfate water
8–1 Write down the colour change you would observe in this reaction. [2]
8–2 Describe the type of bonding in anhydrous copper(II) sulfate.
Write your answer in terms of forces. [3]
8–3 Suggest how anhydrous copper(II) sulfate could be used as a test
for water. Describe any changes you would observe. [3]
Total: 8
p252 5.4.1.4
p204–5 5.4.2.1
p479 5.6.1.3 WS1.2
p485 5.6.2.1
p486 5.6.2.2
p486 5.6.2.3
p487 5.6.2.4
p489 5.6.2.6
p489

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