Two gases, X and Y, react to give a gaseous product Z - Edexcel - GCSE Chemistry Combined Science - Question 9 - 2016 - Paper 1

In chemical reactions, the rate can be influenced by various factors including temperature and pressure. In Experiment 1, the temperature is set at 30°C and the pressure at 1 atm, while in Experiment 2, the temperature is lowered to 20°C and the pressure is increased to 2 atm.

The relationship between temperature and reaction rate is generally direct; increasing the temperature tends to increase the rate of reaction due to higher kinetic energy, resulting in more frequent and effective collisions between particles. However, in Experiment 2, although the pressure is higher, the lower temperature may counteract this effect by reducing the kinetic energy of the molecules involved.

Thus, it is difficult to determine the overall effect on the reaction rate just based on these conditions without specific knowledge of how the reaction between gases X and Y responds to changes in temperature and pressure. As a result, we cannot accurately predict whether the rate of reaction in Experiment 2 will be faster, slower, or the same as in Experiment 1.