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Answer each question and check where every mark went.
- 1
Question 1
Oxygen is produced by the decomposition of aqueous hydrogen peroxide, H₂O₂. Manganese(IV) oxide, MnO₂, acts as a catalyst for this reaction. A student adds powdered manganese(IV) oxide to aqueous hydrogen peroxide in a conical flask fitted with a loose cotton-wool plug, and records the mass of the flask and contents at regular time intervals. The mass decreases as time increases.
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10 marksOpen › - 2
Question 2
Methane reacts with steam in a closed system. The reaction is reversible and reaches equilibrium: CH₄(g) + H₂O(g) ⇌ CO(g) + 3H₂(g).
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9 marksOpen › - 3
Question 3
Ammonia and sulfuric acid are both manufactured using reversible reactions carried out under controlled conditions.
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9 marksOpen › - 4
Question 4
The decomposition of hydrogen peroxide is exothermic. Energy changes can be shown on a reaction pathway diagram and explained using bond energies.
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8 marksOpen ›