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Chemical Equilibrium

Chemical Kinetics and Le Chatelier's Principle

QuestionAnswer
The manufacture of Ammonia is known as: The Haber process
What is dynamic equilibrium? When a chemical reaction is in dynamic equilibrium the rate of the forward reaction is equal to the backward reaction and there is no net gain or loss of reactants or products
What is "Le Chateliers Principle"? If a system in equilibrium is subjected to a stress (a change in pressure, temperature or concentration) then the system alters so as to oppose that stress
How does a change in pressure influence chemical equilibrium? An increase in pressure favors the side with the least volumes. A decrease in pressure favors the side with the most volumes
How does a change in concentration influence chemical equilibrium? An increase in concentration on one side drives the equation to the other side. A decrease in concentration from one side pulls the equilibrium to that side.
How does a change in temperature influence chemical equilibrium? An increase in temperature favours the Edothermic side while a decrease in temperature favours the Exothermic side.
How does the addition of a catalyst influence chemical equilibrium? Adding a catalyst has no effect on the chemcial equilibrium, it simply get the reaction to dynamic equilibrium quicker.
What temperatures and pressure conditions are used in the production of Ammonia in the Haber Process? How does this vary from le Chateliers predictions? 200atm of pressure and a temperature of 500 celcius. Le Chatelier predicts high pressure and low temp. However high pressure is too expensive and low temp is too slow.
What is the name of the industrial production of Sulphuric Acid? The Contact Process
What catalyst is used in the production of Sulphuric Acid? Vanadium Pentoxide
What pressure and temperature conditions are used in the production of Sulphuric Acid? How does this differ from le Chateliers principle? A pressure slightly above atmospheric pressure and a temperature of 500 celcius is used. Le Chateliers predicts high pressure and low temp however high pressure is too expensive and low temp is too slow.
What are the units of Kc, the equilibrium constant expression? It has no units. A number below 1 indicates that the equation has not moved far to the right and made much product. The higher the value of Kc the better for production.
What is the symbol for an exothermic reaction? ^H-
What is the symbol for an endothermic reaction? ^H+
Created by: cbschemistry
 

 



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