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General Chemistry

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Equilibrium and Kinetics

Question
8 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


If the pressure applied to Reaction 1 is decreased, what is the most likely effect?

A The equilibrium will shift toward the left
B The equilibrium will shift toward the right
C There will be no effect on the equilibrium
D The volume of the system will decrease
Ans. C The pressure is decreased in the system. Such a decrease in pressure will not change the reaction mode. Let's take a look at the reacting system.

image\28660 ch 11 sol 8.png

Both sides of the equation have equal number of moles - two on the reactant side and two on the product side. So the pressure change will not affect the reaction in this case.

Equilibrium and Kinetics Flashcard List

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