Lesson 4.6.2.5
4.6.2.5 The effect of changing concentration (HT only) Quiz: AQA Chemistry, Unit 6
20 questions
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Lesson 4.6.2.5, The effect of changing concentration (HT only): 20 multiple choice questions for the AQA GCSE Chemistry (8462), Unit 6: The rate and extent of chemical change, written with Revision Ninja.
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The 20 questions
-
What happens if reactant concentration is increased in an equilibrium mixture?
- More products form
- Pressure decreases
- More reactants form
- Temperature drops
-
What happens if product concentration is decreased in an equilibrium mixture?
- Equilibrium stops
- More products form
- Catalyst deactivates
- More reactants react
-
What happens to all substances when one concentration is changed at equilibrium?
- No concentrations change
- All concentrations change
- Only reactants change
- Only products change
-
Higher tier: Adding more reactant to a system at equilibrium shifts the equilibrium towards:
- A catalyst
- Reactants
- Products
- Neither side
-
Higher tier: Removing product from a system at equilibrium shifts the equilibrium towards:
- Products
- Both sides equally
- Neither side
- Reactants
-
Higher tier: Which change makes the reverse reaction more likely?
- Removing reactant
- Removing product
- Increasing product concentration
- Increasing reactant concentration
-
Higher tier: After a concentration change, the system is:
- Stopped
- Inert
- At equilibrium
- Not at equilibrium
-
Higher tier: Decreasing the concentration of a reactant at equilibrium shifts the equilibrium towards:
- Catalysts
- Products
- Reactants
- Both sides equally
-
What is the effect of continuously removing product in an industrial process?
- Stops reaction
- Halts catalyst
- Shifts backward
- Shifts forward
-
For H2 + I2 ⇌ 2HI, what happens if HI is removed from the mixture?
- Temperature increases
- Reaction stops completely
- Equilibrium shifts backward
- Equilibrium shifts forward
-
Why do industrial chemists continuously remove products during reactions?
- Stop equilibrium
- Increase product yield
- Decrease temperature
- Remove catalyst
-
When a product concentration is decreased at equilibrium, what happens to reactant concentration?
- Stays constant
- Doubles
- Increases
- Decreases
-
Higher tier: In H2 + I2 ⇌ 2HI, adding more H2 causes which change?
- More HI forms
- HI decomposes only
- Less HI forms
- H2 disappears
-
What principle is used to predict the effect of changing concentration on a system at equilibrium?
- Conservation of mass
- Bohr's theory
- Avogadro's law
- Le Chatelier's principle
-
Higher tier: Decreasing a product concentration in a reaction at equilibrium causes the equilibrium position to:
- Move towards reactants
- Remain fixed
- Disappear
- Move towards products
-
Higher tier: Predicted effect of decreasing a reactant concentration at equilibrium is that the equilibrium moves towards:
- Both sides equally
- Products
- Reactants
- A catalyst
-
If reactant concentration is increased in an equilibrium system, what will be formed?
- Less catalyst
- More products
- More reactants
- No change
-
Higher tier: Which substance is removed when products are removed continuously?
- Water
- Product molecules
- A catalyst
- Reactant molecules
-
Higher tier: In A + B ⇌ C + D, which change favours more C and D forming?
- Adding C
- Removing C or D
- Adding a catalyst
- Adding D
-
Higher tier: A student adds reactant A to A + B ⇌ C + D at equilibrium. What is the correct conclusion?
- A is removed
- Less C and D form
- More C and D form
- No change
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