Equilibrium Revision

?
  • Created by: ElishaG
  • Created on: 04-04-17 19:40
LEARN TO DRAW CONC-TIME GRAPHS..
..
1 of 18
Why is the rate of the forward reaction high at the start of the reaction?
1)Concentration of reactants is greater at start.2)Greatest number of particles per unit volume at t=0.3)Greatest number of successful collisions per unit time at t=0.
2 of 18
What is dynamic equilibrium?
The equilibrium that exists in a closed system when the rate of the forward reaction is equal to the rate of the reverse reaction.
3 of 18
What is Le Chatelier's Principle?
When a system in dynamic equilibrium is subject to change, equilibrium position will shift to minimise the change.
4 of 18
What are 3 factors that may alter the position of equilibrium?
1)Concentration (of a solution).2)Pressure (of gases).3)Temperature.
5 of 18
Describe the effect of increasing the concentration of reactants on the position of equilibrium.
1)Shift to right.2)To decrease concentration of reactants.3)Amount of products will increase.
6 of 18
Describe the effect of decreasing the concentration of reactants.
1)Shift to left.2)To increase concentration of reactants.3)Amount of reactants will increase.
7 of 18
Describe the effect of increasing the concentration of product on the position of equilibrium.
1)Shift to left.2)To decrease the concentration of products.3)Amount of reactants will increase.
8 of 18
If the reactants had more moles than the products, what would happen to the position of equilibrium if pressure was increased?
1)Shift to right.2)To decrease pressure.3)Because there are fewer moles of gas on the product (right) side.4)Amount of reactants increases.
9 of 18
If the reactants had more moles than the products, what would happen to the position of equilibrium if pressure was decreased?
1)Shift to left.2)To increase the pressure.3)Because there are more moles of gas on the reactant (left) side.4)Amount of reactants will increase.
10 of 18
How do we know if the forward reaction is exothermic?
1)Enthalpy change is negative.2)Heat is released on product side.
11 of 18
If the temperature of a system with forward exothermic reaction was increased..
1)Shift to left.2)To absorb heat energy.3)Because reverse reaction is endothermic.4)Amount of reactants will increase.
12 of 18
If the temperature of a system with forward exothermic reaction was decreased..
1)Shift to right.2)To release heat energy.3)Because the reverse reaction is exothermic.4)The amount of product will increase.
13 of 18
If the temperature of a system with forward endothermic reaction was decreased..
1)Shift to left.2)To release heat energy.3)Because reverse reaction is exothermic.4)Amount of reactants will increase.
14 of 18
State and explain the effect on equilibrium position after adding a catalyst.
1)Equilibrium position does not change.2)Rate of forward reaction and reverse reactions increases by equal amounts.
15 of 18
State and explain the effect on the time taken to establish equilibrium when a catalyst is added.
1)Time taken reduced.2)Catalyst provides alternate reaction pathway-lower activation energy.3)Greater proportion of particles with energy above activation energy.4)Greater number of successful collisions per unit time.5)Increases rate of reaction.
16 of 18
State an advantage of using a catalyst in a chemical reaction.
1)Reaction takes place at lower temperatures with lower energy demand so less carbon dioxide emitted.2)Better atom economy-different reactions used.3)Catalyst can be reused.
17 of 18
LOOK AT PAGE ON HABER PROCESS IN BOOKLET.
..
18 of 18

Other cards in this set

Card 2

Front

Why is the rate of the forward reaction high at the start of the reaction?

Back

1)Concentration of reactants is greater at start.2)Greatest number of particles per unit volume at t=0.3)Greatest number of successful collisions per unit time at t=0.

Card 3

Front

What is dynamic equilibrium?

Back

Preview of the front of card 3

Card 4

Front

What is Le Chatelier's Principle?

Back

Preview of the front of card 4

Card 5

Front

What are 3 factors that may alter the position of equilibrium?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Equilibrium resources »