The table shows the percentage yield of the product of a gaseous reaction at two temperatures and two pressures. What do the data show about the forward reaction?
Table: The percentage yield of the product of a gaseous reaction at two temperatures and two pressures
| Temperature in ∘C^\circ\text{C}∘C | Pressure in atmospheres | Percentage yield of the product in % |
|---|---|---|
| 200 | 100 | 62 |
| 200 | 400 | 80 |
| 400 | 100 | 25 |
| 400 | 400 | 48 |
It is exothermic and there are fewer gas molecules in the products
It is exothermic and there are more gas molecules in the products
It is endothermic and there are fewer gas molecules in the products
It is endothermic and there are more gas molecules in the products
109 exam-style questions on AQA GCSE Chemistry 6.2 Reversible reactions and dynamic equilibrium, covering 6.2.1 Reversible reactions, 6.2.2 Energy changes and reversible reactions, 6.2.3 Equilibrium, 6.2.4 The effect of changing conditions on equilibrium, 6.2.5 The effect of changing concentration, 6.2.6 The effect of temperature changes on equilibrium, and 6.2.7 The effect of pressure changes on equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.