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Chemical Equilibrium
Chemical Kinetics and Le Chatelier's Principle
| Question | Answer |
|---|---|
| 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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