Dynamic Equilibrium
Cambridge IGCSE Chemistry 0620 · Papers 2 & 4 · 15 Questions · 32 Marks
State two features of a reaction at dynamic equilibrium.
Write your answer here before revealing...
The reaction H₂(g) + I₂(g) ⇌ 2HI(g) reaches equilibrium in a sealed container. State two observable properties of the system at equilibrium.
Write your answer here before revealing...
Define the term 'dynamic equilibrium'.
Write your answer here before revealing...
The symbol '⇌' is used in a chemical equation. What does this symbol indicate?
Write your answer here before revealing...
The graph shows the concentration of reactant A and product B over time for a reversible reaction in a closed system. [Graph shows concentrations levelling off at t = 40s] (a) At what time does the system reach equilibrium? [1] (b) State two features that tell you equilibrium has been reached. [2]
Write your answer here before revealing...
Explain why a reversible reaction must occur in a closed system in order to reach equilibrium.
Write your answer here before revealing...
A student heats calcium carbonate in an open crucible. The reaction CaCO₃(s) ⇌ CaO(s) + CO₂(g) does not reach equilibrium. Explain why.
Write your answer here before revealing...
State two conditions, other than temperature, that must remain constant for a system to stay at equilibrium.
Write your answer here before revealing...
The reaction N₂(g) + 3H₂(g) ⇌ 2NH₃(g) occurs in an industrial reactor. Explain why the reactor must be sealed (closed system) for equilibrium to be established.
Write your answer here before revealing...
Describe the difference between an open system and a closed system. In which type of system can dynamic equilibrium be reached? Justify your answer. [3]
Write your answer here before revealing...
A student states: 'At equilibrium, the reaction stops because the concentrations stop changing.' Explain why this statement is incorrect.
Write your answer here before revealing...
A student claims: 'At equilibrium, the concentration of reactants equals the concentration of products.' Is this correct? Explain your answer.
Write your answer here before revealing...
A student says: 'Adding a catalyst to a reaction at equilibrium will shift the position of equilibrium to the right, producing more product.' Evaluate this statement.
Write your answer here before revealing...
A student writes in their notes: 'Equilibrium means the forward reaction rate is faster than the reverse reaction rate.' Identify the error and write a correct statement.
Write your answer here before revealing...
The reaction 2SO₂(g) + O₂(g) ⇌ 2SO₃(g) is allowed to reach equilibrium in a sealed container at constant temperature. A student makes two statements: Statement 1: 'The reaction is complete because SO₃ is being formed.' Statement 2: 'No more SO₂ is being used up once equilibrium is reached.' Evaluate both statements, using your understanding of dynamic equilibrium. [3]
Write your answer here before revealing...
📊 Your Score Summary
0
Marks Earned
32
Total Marks
0%
Percentage
Below 50%
Review the lesson
50–69%
Practice keywords
70%+
Exam ready ✓
🎯 The Golden Rule for Equilibrium Questions
Every equilibrium mark scheme rewards three core ideas: (1) both reactions are still occurring, (2) forward rate equals reverse rate, and (3) concentrations are constant — not equal, not zero. Master these and you own equilibrium in Papers 2, 4, and 6.
Sign In to Keep Going
You've reached the end of the free preview. Sign in — and upgrade to Plus or Pro — to keep going with Chemistry.
Full Access
Unlock all 320 lessons