Multiple Choice
Which phase change occurs for water at 100 °C under standard atmospheric pressure?
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1. Intro to General Chemistry
Temperature
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Which physical quantity measures the average kinetic energy of particles in a substance?
A
Temperature
B
Density
C
Pressure
D
Volume
Verified step by step guidance1
Understand that the question asks for the physical quantity that measures the average kinetic energy of particles in a substance.
Recall that kinetic energy of particles is related to their motion and speed at the microscopic level.
Recognize that temperature is defined as a measure of the average kinetic energy of the particles in a substance.
Note that density measures mass per unit volume, pressure measures force per unit area, and volume measures the space occupied, none of which directly measure kinetic energy.
Conclude that temperature is the correct physical quantity that reflects the average kinetic energy of particles.
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