Multiple Choice
Which of the following changes would NOT cause an increase in the pressure of a contained gas?
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7. Gases
Chemistry Gas Laws
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Which of the following best illustrates Charles's Law?
A
The volume of a gas is directly proportional to the number of moles at constant temperature and pressure.
B
The pressure of a gas is directly proportional to its temperature at constant volume.
C
The pressure of a gas increases as its volume decreases at constant temperature.
D
The volume of a gas increases as its temperature increases at constant pressure.
Verified step by step guidance1
Recall that Charles's Law describes the relationship between the volume and temperature of a gas when pressure is held constant.
Charles's Law states that the volume of a gas is directly proportional to its absolute temperature (in Kelvin) at constant pressure, which can be written as \(V \propto T\) or \(\frac{V_1}{T_1} = \frac{V_2}{T_2}\).
Analyze each option to see which one matches this relationship: the volume should increase as temperature increases, assuming pressure remains constant.
The first option relates volume to moles, which corresponds to Avogadro's Law, not Charles's Law.
The second and third options involve pressure changes or pressure-volume relationships, which correspond to Gay-Lussac's Law and Boyle's Law respectively, so they do not illustrate Charles's Law.
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