Multiple Choice
How does the distance between particles affect the rate of diffusion?
15. Chemical Kinetics
Factors Influencing Rates
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Which of the following factors would increase the diffusion rate of a gas?
A
Increasing the molecular weight of the gas
B
Increasing the temperature
C
Decreasing the surface area
D
Decreasing the concentration gradient
Verified step by step guidance1
Understand the concept of diffusion: Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. The rate of diffusion can be influenced by several factors.
Consider the effect of temperature: Increasing the temperature provides more kinetic energy to the gas molecules, causing them to move faster. This increased movement enhances the rate of diffusion.
Analyze the molecular weight: Increasing the molecular weight of a gas generally decreases its diffusion rate because heavier molecules move more slowly compared to lighter ones.
Evaluate the surface area: Decreasing the surface area would reduce the space available for diffusion, thus decreasing the rate of diffusion.
Examine the concentration gradient: A higher concentration gradient means a larger difference in concentration between two areas, which typically increases the diffusion rate. Decreasing the concentration gradient would lower the diffusion rate.
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