In exothermic reactions, are bonds broken or formed?
Bonds are formed
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In endothermic reactions, are bonds broken or formed?
Bonds are broken
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What is activation energy?
The minimum amount of energy needed by reacting particles for the reaction to occur.
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What is bond dissociation energy?
The amount of energy in a bond.
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How can you measure energy transfer?
By an exothermic reaction. By taking the temperature of the reagents , mixing them in a polystyrene cup and measuring the temperature of the solution at the end of the reaction.
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How is fuel energy calculated?
Using calorimetry
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What does it mean when a reaction reaches equilibrium?
means the amount of reactants and products will reach a certain balance and stay there.
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What happens to the position of the equilibrium is you raise or lower the temperature.
raising the temperature - position will shift towards the endothermic reaction. Lower temperature - position will move towards the exothermic reaction.
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How can changing the pressure changing the yield of a reaction?
Increase in pressure - encourage the reaction which produces fewer molecules. Lower the pressure - will encourage the reaction with more molecules.
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What is the Haber Process?
An important industrial process which produces ammonia.
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What can ammonia be used for?
For fertilisers.
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What two elements are needed to produce ammonia.
Nitrogen and Hydrogen
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How can a bigger yield be produced when producing ammonia.
A higher pressure, lower temperature, but lower temperature means lower rate of reaction. So a compromise is made at 450 degrees C.
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What catalyst can be used to speed up the production of ammonia?
an iron catalyst
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Other cards in this set
Card 2
Front
In endothermic reactions, are bonds broken or formed?
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