Chemical Equilibrium
4 past-paper questions on Chemical Equilibrium · examined 2021–2024.
20241 question
If calcium carbonate is heated in a closed container, it will decompose, forming calcium oxide and carbon dioxide. Calcium oxide and carbon dioxide can recombine to form calcium carbonate. After some time, a position is reached where calcium carbonate is decomposing, and calcium oxide and carbon dioxide are recombining at the same rate. What is this position called?
20231 question
Aqueous bromine is an equilibrium mixture. Which row shows how the colour of the mixture changes when a small amount of each substance is added?
20212 questions
Elements X and Y react together in a reversible reaction to form XY2. X + 2Y XY2 1.0 mol of X is mixed with 1.0 mol of Y and the mixture is left to react until an equilibrium position is reached. Which statements about this reaction are correct?
Brown nitrogen dioxide reacts to form colourless dinitrogen tetroxide in a reversible reaction. The forward reaction is exothermic. Which changes would make the equilibrium mixture darker in colour?
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