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General Chemistry

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Equilibrium and Kinetics

Question
7 out of 13
 

At this point of advancements in science, chemists have a good understanding of the kinetics of reactions. They can predict the effects of changes in pH, temperature, and concentration in chemical reactions.

In a cylinder, there is a reaction mixture of hydrogen and iodine. The hydrogen and the iodine react to form hydrogen iodide.

image\27420 ch 11 passage 1.png

The industrial production of ammonia is done by a process called Haber process. The reaction occurs as shown below, and is usually done in the presence of an iron catalyst.

image\27430 ch 11 passage 1.png

ΔH = –92kJ


Which of the following is most likely to occur, if we take away H2 from the reaction mixture in Reaction 1?

A The reaction will proceed to the right
B The reaction will suddenly reach equilibrium
C The reaction will proceed to the left
D No apparent effect will be observed
Ans. C In the experiment, the hydrogen is removed. Such a change in concentration will upset the equilibrium. We have to approach this problem in terms of LeChatelier's principle. Changes in the concentrations of reactants or products of this reaction will turn the system into a non-equilibrium state. The result will be an adjustment of the reaction mode to restore the system to equilibrium. So if we take H2 away, the backward reaction will be favored for restoring the equilibrium.

Equilibrium and Kinetics Flashcard List

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