Lesson 3.1.6.1
3.1.6.1 Chemical equilibria and Le Chatelier's principle Quiz: AQA Chemistry, Unit 1
20 questions
In partnership with Revision Ninja
Lesson 3.1.6.1, Chemical equilibria and Le Chatelier's principle: 20 multiple choice questions for the AQA Chemistry (7405), Unit 1: Physical chemistry, written with Revision Ninja.
Host it live on the board and students join with a game code on their own devices, or revise alone with Free Play. The answers are revealed in the game.
The 20 questions
-
For an exothermic reaction at equilibrium, how does increasing temperature shift the equilibrium position?
- To the right
- No shift
- Increases yield
- To the left
-
Increasing pressure shifts the equilibrium N2(g) + 3H2(g) ⇌ 2NH3(g) in which direction?
- To the left
- No shift
- To reactants
- To the right
-
Which conditions maximise the equilibrium yield of sulfur trioxide in the exothermic Contact process?
- Low temperature, low pressure
- Low temperature, high pressure
- High temperature, low pressure
- High temperature, high pressure
-
What happens to the equilibrium position when reactant concentration is increased?
- No effect
- Shifts right
- Stops completely
- Shifts left
-
How does continuously removing a product affect a dynamic chemical equilibrium?
- Stops reaction
- Shifts right
- Shifts left
- No effect
-
Why does adding a catalyst have no effect on the position of chemical equilibrium?
- Forward rate decreases
- Activation energy increases
- Yield increases equally
- Rates increase equally
-
Why is a compromise temperature used in the industrial Haber process?
- To reduce pressure
- To increase yield
- To decrease safety
- To increase rate
-
Why is a compromise pressure used in the industrial Contact process?
- Unstable catalysts
- High plant costs
- Reduced reaction rate
- Lower equilibrium yield
-
Adding concentrated HCl to aqueous blue [Cu(H2O)6]2+ turns it yellow-green. What shifted equilibrium?
- Increased pressure
- Increased chloride concentration
- Decreased temperature
- Decreased chloride concentration
-
At constant temperature, which factor changes the position of a gaseous equilibrium?
- Pressure change
- Surface area
- Particle size
- Adding catalyst
-
Increasing pressure on the gaseous equilibrium H2 + I2 ⇌ 2HI causes what shift?
- Yield increases
- No shift
- Shifts right
- Shifts left
-
Lowering the temperature of an exothermic reaction at equilibrium causes what outcome?
- Faster reaction rate
- No yield change
- Lower product yield
- Higher product yield
-
Which conditions produce the highest equilibrium yield for N2O4(g) ⇌ 2NO2(g) where ΔH is positive?
- High temperature, high pressure
- Low temperature, low pressure
- High temperature, low pressure
- Low temperature, high pressure
-
Increasing temperature for 2NO2(g) ⇌ N2O4(g) (ΔH = -58 kJ mol⁻¹) increases the concentration of which gas?
- Neither gas
- Both gases
- NO2
- N2O4
-
For the exothermic methanol synthesis from CO and H2, which conditions give the highest yield?
- Low pressure, low temperature
- Low pressure, high temperature
- High pressure, low temperature
- High pressure, high temperature
-
Why is a compromise temperature used industrially for exothermic reversible reactions?
- To increase yield
- To preserve catalyst
- To lower pressure
- To increase rate
-
Which change shifts the equilibrium position of N2(g) + O2(g) ⇌ 2NO(g) (endothermic) to the right?
- Decreasing pressure
- Increasing temperature
- Increasing pressure
- Decreasing temperature
-
What happens to the equilibrium position of N2(g) + 3H2(g) ⇌ 2NH3(g) when volume is halved?
- Kc increases
- Shifts left
- Shifts right
- No change
-
How does increasing temperature affect the product yield of a reaction with ΔH = +40 kJ mol⁻¹?
- Yield remains unchanged
- Yield increases
- Kc decreases
- Yield decreases
-
Compression of a gas equilibrium mixture causes the position of equilibrium to shift towards which side?
- Equal gas moles
- More gas moles
- Fewer gas moles
- Exothermic side
Related quizzes
- Fundamental particles Quiz · 3.1.1.1 · 20 questions
- Mass number and isotopes Quiz · 3.1.1.2 · 20 questions
- Electron configuration Quiz · 3.1.1.3 · 20 questions
- Relative atomic mass and relative molecular mass Quiz · 3.1.2.1 · 20 questions
- The mole and the Avogadro constant Quiz · 3.1.2.2 · 20 questions
- The ideal gas equation Quiz · 3.1.2.3 · 20 questions
- Empirical and molecular formula Quiz · 3.1.2.4 · 20 questions
- Balanced equations and associated calculations Quiz · 3.1.2.5 · 20 questions
- Ionic bonding Quiz · 3.1.3.1 · 20 questions
- Nature of covalent and dative covalent bonds Quiz · 3.1.3.2 · 20 questions