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WorksheetsFactors that affect chemical equilibrium
Total questions: 15
Worksheet time: 8mins
Name
Class
Date
1.
Which factors can cause a shift in the position of chemical equilibrium?
a)
Change in concentration of reactants or products
b)
Change in pressure for gaseous systems
c)
Change in volume for liquid systems
d)
Change in temperature
2.
According to Le Chatelier's Principle, how does a system at equilibrium respond to a decrease in temperature?
a)
Favours the exothermic reaction
b)
Favours the endothermic reaction
c)
Shifts to increase temperature
d)
Shifts to decrease temperature
3.
What is the effect of adding a catalyst to a reaction at equilibrium?
a)
Increases the rate of the forward reaction
b)
Increases the rate of the reverse reaction
c)
Changes the position of equilibrium
d)
Decreases the activation energy of the reaction
4.
What happens to the position of equilibrium when the pressure is increased for a reaction involving gases?
a)
Shifts to the side with more moles of gas
b)
Shifts to the side with fewer moles of gas
c)
Remains unchanged if the number of moles of gas is equal on both sides
d)
Shifts to the side with higher molecular weight gases
5.
Which statement is true regarding the equilibrium constant (Kc) for a reversible reaction?
a)
It changes with temperature
b)
It is unaffected by changes in pressure
c)
It decreases with the addition of a catalyst
d)
It is the same for both the forward and reverse reactions
6.
How does an increase in the concentration of reactants affect a system at equilibrium?
a)
Shifts the equilibrium to the left
b)
Shifts the equilibrium to the right
c)
Increases the value of the equilibrium constant
d)
Increases the rate at which equilibrium is achieved
7.
What is the consequence of removing a product from a chemical equilibrium?
a)
Equilibrium shifts to the right to produce more product
b)
Equilibrium shifts to the left to consume more reactants
c)
The equilibrium constant increases
d)
The reaction stops completely
8.
What effect does a decrease in temperature have on an exothermic reaction at equilibrium?
a)
Shifts the equilibrium towards the reactants
b)
Shifts the equilibrium towards the products
c)
Decreases the equilibrium constant
d)
Increases the rate of the reverse reaction
9.
In a closed system at equilibrium, what is the effect of increasing the volume?
a)
Decreases pressure and shifts the equilibrium towards more moles of gas
b)
Increases pressure and shifts the equilibrium towards fewer moles of gas
c)
Has no effect on liquid or solid equilibrium systems
d)
Increases the equilibrium constant
10.
Which of these changes will NOT affect the equilibrium position of a system?
a)
Adding a catalyst
b)
Changing the concentration of a reactant
c)
Altering the temperature
d)
Using a different container without changing the volume
11.
Which statements are true for a system at equilibrium when the temperature is increased?
a)
The equilibrium shifts in the direction of the endothermic reaction
b)
The equilibrium constant remains unchanged
c)
The rate of the forward reaction increases
d)
The equilibrium shifts in the direction of the exothermic reaction
12.
What role does the equilibrium constant play in determining the position of equilibrium?
a)
It indicates the direction in which the reaction naturally proceeds
b)
It predicts the exact concentrations of reactants and products at equilibrium
c)
It determines the speed at which equilibrium is reached
d)
It reflects the extent to which reactants are converted to products
13.
How does the addition of an inert gas at constant volume affect a gaseous equilibrium system?
a)
Increases the total pressure without affecting equilibrium
b)
Shifts the equilibrium towards the side with more gas molecules
c)
Shifts the equilibrium towards the side with fewer gas molecules
d)
Does not change the partial pressures of reacting gases
14.
What is the result of decreasing the concentration of a product in a reaction at equilibrium?
a)
The equilibrium shifts to make more of the product
b)
The equilibrium shifts to make less of the product
c)
The reaction rate decreases
d)
The reaction rate increases as the system tries to restore equilibrium
15.
Which of the following are true when a system at equilibrium is subjected to a change in concentration?
a)
The system will shift to oppose the change
b)
The equilibrium constant (Kc) will change
c)
The reaction will shift to restore equilibrium at a new concentration level
d)
The position of equilibrium will remain the same
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