IB Chemistry Mock Exam Review - Paper 1 2022-2023
Quiz by arnel
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- Q1
The Haber process can be represented by the equation:
N2(g)+3H2(g)↔2NH3(g)
What will the effect be on the position of equilibrium and the Kc value if the pressure is decreased on the reaction vessel?
Kc decreases and equilibrium shifts to the left.
Kc is unchanged but equilibrium shifts to the right.Kc increases and equilibrium shifts to the left.Kc is unchanged but equilibrium shifts to the left.120s - Q2
An acidic solution with a pH of 2 was diluted by taking 10 cm3 of it and adding it to 90 cm3 of distilled water.
What would the pH of the solution be after this dilution?
5432120s - Q3
There are multiple ways to define oxidation and reduction. Choose the correct combination of terms which both describe the process of reduction.
The gain of oxygen OR the loss of electrons.
The loss of hydrogen OR the gain of electrons.
The loss of oxygen OR the gain of electrons.
The loss of oxygen OR the loss of hydrogen.
120s - Q4
Which statement about chemical equilibria implies they are dynamic?
The reactants and products continue to react.
The position of equilibrium constantly changes.
The concentrations of the reactants and products continue to change.
The rates of forward and backward reactions change.
120s - Q5
The sequence of diagrams represents the system as time passes for a gas phase reaction in which reactant X is converted to product Y.
Which statement is correct?
At t= 7 seconds the reaction has reached completion.
At t= 5 days the rate of the forward reaction is less than the rate of the backward reaction.
At t= 5 days the rate of the forward reaction is greater than the rate of the backward reaction.
At t= 10 minutes the system has reached a state of equilibrium.
120s - Q6
Consider the endothermic reaction below.
5CO (g) + I2O5 (g) = 5CO2 (g) + I2 (g)
According to Le Chatelier’s principle, which change would result in an increase in the amount of CO2?
Increasing the temperature
Decreasing the temperature
Increasing the pressure
Decreasing the pressure
120s - Q7
What effect will an increase in temperature have on the Kc value and the position of equilibrium in the following reaction?
N2 (g)+ 3H2 (g) = 2NH3 (g) ΔH= –92 kJ
Kc increases and equilibrium position shifts to the left
Kc increases and equilibrium position shifts to the right
Kc decreases and equilibrium position shifts to the left
Kc decreases and equilibrium position shifts to the right
120s - Q8
What is the effect of an increase of temperature on the yield and the equilibrium constant for the following reaction?
2H2(g)+ CO(g) = CH3OH(l) ∆HO = –128 kJ
yield decreases and Kc decreases
yield decreases and Kc increases
yield increases and Kc decreases
yield increases and Kc increases
120s - Q9
What changes occur when the temperature is increased in the following reaction at equilibrium?
Br2(g) + Cl2(g) = 2BrCl (g) ∆Hο = +14 kJ mol–1
The position of equilibrium shifts towards the reactants and the value of equilibrium constant decreases.
The position of equilibrium shifts towards the products and the value of equilibrium constant decreases.
The position of equilibrium shifts towards the products and the value of equilibrium constant increases.
The position of equilibrium shifts towards the reactants and the value of equilibrium constant increases.
120s
