Open Question
Which of the gases has the fastest‑moving molecules, on average, at a given temperature?
7. Gases
Kinetic Molecular Theory
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Which of the following statements about diffusion is true?
A
Diffusion is the movement of particles from an area of high concentration to an area of low concentration.
B
Diffusion requires an external energy source to occur.
C
Diffusion occurs faster at lower temperatures.
D
Diffusion only occurs in liquids.
Verified step by step guidance1
Understand the concept of diffusion: Diffusion is the process by which particles spread from an area of high concentration to an area of low concentration, driven by the random motion of particles.
Evaluate the statement 'Diffusion requires an external energy source to occur': Diffusion is a spontaneous process and does not require an external energy source. It occurs due to the natural kinetic energy of particles.
Evaluate the statement 'Diffusion occurs faster at lower temperatures': Temperature affects the kinetic energy of particles. Higher temperatures increase particle movement, thus diffusion occurs faster at higher temperatures, not lower.
Evaluate the statement 'Diffusion only occurs in liquids': Diffusion can occur in gases, liquids, and solids, although the rate and mechanism may vary depending on the state of matter.
Identify the correct statement: Based on the understanding of diffusion, the true statement is 'Diffusion is the movement of particles from an area of high concentration to an area of low concentration.'
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