Multiple Choice
What is the ratio of the effusion rates of hydrogen gas (H2) to krypton gas (Kr) according to Graham's law of effusion?
7. Gases
Effusion
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Which of the following is true about diffusion?
A
Diffusion requires an external energy source to occur.
B
Diffusion occurs only in liquids.
C
Diffusion results in the particles moving against the concentration gradient.
D
Diffusion is the movement of particles from an area of high concentration to an area of low concentration.
Verified step by step guidance1
Understand the concept of diffusion: Diffusion is a process where particles move from an area of higher concentration to an area of lower concentration, driven by the concentration gradient.
Recognize that diffusion is a passive process: It does not require an external energy source. Instead, it relies on the natural kinetic energy of particles.
Identify the environments where diffusion can occur: Diffusion is not limited to liquids; it can occur in gases, liquids, and even solids, wherever there is a concentration gradient.
Clarify the direction of particle movement: In diffusion, particles move down the concentration gradient, not against it, meaning they move from high to low concentration areas.
Summarize the correct statement: Diffusion is characterized by the movement of particles from an area of high concentration to an area of low concentration, without the need for external energy.
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