Multiple Choice
According to the kinetic molecular theory, if the molecules of a gas sample speed up, which of the following will most likely occur?
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7. Gases
Kinetic Molecular Theory
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According to the kinetic molecular theory, which factor primarily determines the average speed of atoms and molecules in a substance?
A
Temperature of the substance
B
Pressure exerted by the substance
C
Number of moles present
D
Volume of the container
Verified step by step guidance1
Recall the kinetic molecular theory, which explains the behavior of gases in terms of the motion of their particles.
Understand that the average speed of atoms and molecules is related to their kinetic energy, which depends on temperature.
Recognize that temperature is a measure of the average kinetic energy of particles, so as temperature increases, the average speed of particles increases.
Note that pressure, number of moles, and volume affect other properties like gas pressure and density but do not directly determine the average speed of particles.
Conclude that the primary factor determining the average speed of atoms and molecules in a substance is the temperature of the substance.
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