A process-development team studies a reversible reaction between gases in a sealed reactor.
P(g)+Q(g)⇌3R(g) \mathrm{P(g) + Q(g) \rightleftharpoons 3R(g)} P(g)+Q(g)⇌3R(g)The forward reaction is endothermic. Every run starts with the same amounts of P and Q and no R. The team records the percentage of P converted once equilibrium is reached. In each comparison, only one condition is changed.
Which pair of observations is consistent with this reaction?
At higher temperature, more P is converted; at higher pressure, less P is converted.
At higher temperature, less P is converted; at higher pressure, less P is converted.
At higher temperature, less P is converted; at higher pressure, more P is converted.
At higher temperature, more P is converted; at higher pressure, more P is converted.
124 exam-style questions on OCR GCSE Chemistry 5.3 Equilibria, covering 5.3.1 Reversible reactions and dynamic equilibrium and 5.3.2 Changing the position of equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.