Reversable Reactions Flashcards
(8 cards)
What are reversible reactions
Reactions that go both ways
Examples of reversible reactions
Exothermic and endothermic
Conservation of energy - energy released or absorbed by forward reaction will be the same as energy releases or absorbed by backward reaction
What is a closed system
Where reactants and products can neither be added or removed
Dynamic equilibrium
Rates of forward and backwards reactions are equal
Both reactions are still taking place
Conc of reactant and products don’t change when a reactions is at dynamic equilibrium
Changing conditions in equilibrium
Affects the position of equilibrium
Conditions determine reletive quantity of different reactants and products in a reaction at equilibrium
Le chateliers principle
If any of the conditions of a reversible reaction change, the closed system will adapt to counteract what has been changed
Changing temperature
Changing temp takes system out of equilibrium so they system will react to restore that equilibrium
When temps decreased:
Position of equilibrium will shift in exothermic direction
Amount of products generated by exothermic reaction will increase and the amount of product generated by endothermic reaction will decrease
When temp increased
Position of equilibrium will shift in endothermic direction
Amount of products generated by endothermic reaction will increase and amount of products generated by exothermic reaction will decrease
Pressure and equilibrium
Pressure only effects reactions that involve gass
When pressures increased
Position of equilibrium shifts o favour reaction that produces the fewest gass molecules
When pressures decreased
Position of equilibrium shifts towards the side that produces the most gas molecules
Concentration and equilibrium
Changing conc takes system out of equilibrium so the system will try restore equilibrium
Increased concentration of a reactant
Shifts position of equilibrium towards the product
Increased concentration of product
Shifts equilibrium towards reactants
