Question

Consider two gases A and B in a container at room temperature. What effect will the following changes have on the reaction rate between the gases?

1. The pressure is increased.
2. The number of molecules of gas 'A' is doubled.
3. The temperature is decreased.
A. 1 only
B. 2 only
C. 3 only
D. All of the above

Answer 1

The reaction rate between two gases will increase with higher pressure and doubling the number of molecules of one gas, but decrease with lower temperature; thus, option D. is the correct answer.

Step-by-step explanation:

The effect on the reaction rate between two gases, A and B, in a container at room temperature when various changes are made can be analyzed through the principles of gas laws and reaction kinetics.

• Increasing pressure would cause the gas particles to have more collisions with each other, thus increasing the reaction rate.
• Doubling the number of molecules of gas 'A' would lead to more frequent collisions between the reactant particles and therefore increase the reaction rate as per Avogadro's law.
• Decreasing the temperature would lower the particles' kinetic energy and the frequency of effective collisions, subsequently decreasing the reaction rate according to Amontons's law.

Therefore, all three changes have an impact on the reaction rate, making the correct answer D. All of the above.