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Chemistry Edexcel GCSE:
Reversible Reactions

Page 1



1. When methane reacts with steam the temperature falls.

The equation for the reaction is:

CH4 + H2OCO + 3H2

What does the symbol represent, and is the reaction between methane and steam exothermic or endothermic?

  meaning of Reaction type
A equilibrium endothermic
B equilibrium exothermic
C Reversible reaction endothermic
D Reversible reaction exothermic

The following reversible reaction was investigated:

NH4Cl(s)NH3(g)  +  HCl(g)

2. What conditions are required to make this reaction go in the forward and the reverse directions?

  Forward Reverse
A heat cool
B heat heat
C cool cool
D cool heat
3. What type of reaction is the forward reaction?
  • A.   neutralization
  • B.   precipitation
  • C.   sublimation
  • D.   thermal decomposition
4. Which one of the following statements is true about reversible reactions?
  • A. All reactions are reversible under lab conditions
  • B. All reversible reactions are in dynamic equilibrium
  • C. All reactions go to completion under lab conditions
  • D. The direction of some reversible reactions can be altered by changing the reaction conditions

Reversible reactions that are in dynamic equilibrium have two characteristics.

5. One of the characteristics is that the ..
  • A.   forward reaction is faster than the reverse reaction
  • B.   forward reaction is slower than the reverse reaction
  • C.   forward and reverse reactions both stop
  • D.   forward and reverse reactions occur at the same rate
6. The second characteristic is that the ..
  • A.   concentrations of reactants and products are equal
  • B.   concentrations of reactants and products are constant
  • C.   concentration of reactants is less than concentration of products
  • D.   concentration of reactants is more than concentration of products

Ammonia is produced industrially in the Haber Process:

N2(g) + 3H2(g)2NH3(g)

The conditions used in the Haber Process are …

ammonia molecule model
7. a temperature (in degrees centigrade) of ..
8. a pressure of ..
9. a catalyst of ..
10. What is the main source of the hydrogen used in the Haber Process?
  • A.   natural gas
  • B.   water
  • C.   air
  • D.   hydrochloric acid
11. What is the main source of the nitrogen used in the Haber Process?
  • A.   fertilizers
  • B.   natural gas
  • C.   air
  • D.   coal
12. What happens to the unreacted nitrogen and hydrogen gases in the Haber Process?
  • A.  they are collected and sold
  • B.   they are recycled back into the reactor
  • C.   they are collected and used at a later date
  • D.    they are thrown away as waste products