Multiple Choice
Which of the following changes is most likely to result in an increase in the volume of a gas, assuming all other variables are held constant?
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7. Gases
The Ideal Gas Law
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Under which of the following conditions are gases most likely to behave ideally?
A
Low temperature and low pressure
B
Low temperature and high pressure
C
High temperature and high pressure
D
High temperature and low pressure
Verified step by step guidance1
Recall that gases behave most ideally when the interactions between gas molecules are minimal and the volume of the gas molecules themselves is negligible compared to the container volume.
Understand that at high temperatures, gas molecules have higher kinetic energy, which helps overcome intermolecular attractions, making the gas behave more ideally.
Recognize that at low pressures, gas molecules are far apart, so the volume occupied by the molecules themselves is very small relative to the container, and intermolecular forces are less significant.
Combine these concepts to conclude that gases behave most ideally under conditions of high temperature and low pressure.
Review the other options and note that low temperature or high pressure increase intermolecular forces or molecular volume effects, causing deviations from ideal gas behavior.
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