6.2. Equilibrium

Question 1

symbol for equilibrium

Answer 1

⇌

Question 2

what is a reversible reaction

Answer 2

a reaction where the products can react together to form the original reactants

Question 3

what is dynamic equilibrium

Answer 3

Equilibrium in a closed system where the reactions occur at exactly the same rate in each direction

Question 4

what condition must be satisfied in order to achieve equilibrium

Answer 4

the reversible reaction must take place in a closed system (none of the reactants or products can escape and nothing else can get in)

Question 5

what does the position of equilibrium depend on

Answer 5

temperature, pressure, concentration

Question 6

what does it mean if a system is at equilibrium

Answer 6

A system is at equilibrium when both the forward and reverse reactions are happening at exactly the same rate

Question 7

What is Le Chatelier’s principle?

Answer 7

The idea that if you change the conditions of a reversible reaction at equilibrium, the system will try to counteract that change

Question 8

what happens when you decrease the temperature of a reversible reaction

Answer 8

if you decrease the temperature, the equilibrium will move in the exothermic direction to produce more heat. so you will get more products for the exothermic reaction

Question 9

what happens when you increase the temperature of a reversible reaction

Answer 9

if you raise the temperature, the equilibrium will move in the endothermic reaction to try and decrease it. so you will get more products for the endothermic reaction

Question 10

what equilibrium does pressure effect

Answer 10

equilibrium involving gases

Question 11

What happens when you increase the pressure in a reversible reaction?

Answer 11

if you increase the pressure, the equilibrium tries to reduce it - it moves in the direction where there are fewer molecules of gas

Question 12

what happens when you decrease the pressure in a reversible reaction

Answer 12

if you decrease the pressure, the equilibrium tries to increase it - it moves in the direction where there are more molecules of gas

Question 13

what happens if you change the concentration of either the reactants or the products in an equilibrium

Answer 13

the system responds to bring itself back to equilibrium again.
if you increase the concentration of the reactants the system tries to decrease it by making more products
if you increase the concentration of products the system tries to increase it again by reducing the amount of reactants