Multiple Choice
How does an increase in temperature affect the rate of diffusion?
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1. Intro to General Chemistry
Temperature
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In which situation do water molecules move faster: in a hot cup of coffee or in a cold cup of coffee?
A
In a hot cup of coffee
B
In a cold cup of coffee
C
Molecules move at the same speed in both
D
Molecules do not move in either
Verified step by step guidance1
Understand that the speed of water molecules is related to their kinetic energy, which depends on temperature.
Recall that temperature is a measure of the average kinetic energy of molecules in a substance.
Recognize that in a hot cup of coffee, the temperature is higher, so the water molecules have more kinetic energy and move faster.
In contrast, in a cold cup of coffee, the temperature is lower, so the water molecules have less kinetic energy and move slower.
Therefore, water molecules move faster in a hot cup of coffee compared to a cold cup of coffee.
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