C6b-Reversible reactions Flashcards
What are reversible reactions?
Reactions where the products of the reaction can react to make the original reactants.
What sign is used to denote a reversible reaction?
⇌
What is true about the energy changes of reversible reactions?
Reversible reactions are endothermic in one direction and exothermic in the other.
What is an examble of an endothermic reversible reaction in the forwards direction?
Hydrated copper ⇌ Anhydrous copper + water
What is Le Chatelier’s Principle?
If the conditions of a system at equilibrium are changed, the system will act to oppose the change
What happens to the rate of forward and reverse reactions at equilibrium?
It is equal
Finish the sentence:
Changing the reaction conditions can change…..
…the amounts of products and reactants in a reaction mixture at equilibrium
How does a change in pressure affect reversible reactions?
An increase in pressure will lead to a shift to the side where there is fewer moles of gas created from the reaction.
How does a change in temperature affect reversible reactions?
An increase in temperature will favour the endothermic direction and produce more of those products/reactants.
How does a change in concentration of products/reactants affect reversible reactions?
An increase in concentration of products/reactants will cause more of the other side to be created.
How do you explain a change in concentration using Shift, Favour, Why?
The system will shift to the left/right to increase/decrease the concentration of products/reactants, by favouring the backwards/forwards direction by increasing its rate; due to equilibrium opposing the change and increasing/decreasing the concentration of reactants A&B/ C&D.
How do you explain a change in temperature using Shift, Favour, Why?
The system will shift to the left/right to increase/decrease the temperature of the reaction by favouring the backwards/forwards (endothermic/exothermic) reaction by increasing its rate; due to equilibrium opposing the change and increasing/decreasing the concentration of reactants A&B/ C&D.
How do you explain a change in pressure using Shift, Favour, Why?
The system will shift to the left/right to increase/decrease the pressure of the reaction by favouring direction that produces the most/least molecules of gas by increasing its rate; due to equilibrium opposing the change and increasing/decreasing the concentration of reactants A&B/ C&D.
