Which of the following decreases when a given mass of gas is compressed to half its initial volume?
Average intermolecular distance
Frequency of collisions
Number of molecules present
Atomic radius of each particle
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The correct answer is A) Average intermolecular distance.
When a gas is compressed to half its initial volume, the molecules are packed more closely together, resulting in a decrease in the average intermolecular distance.
The other options do not decrease when a gas is compressed:
B) Frequency of collisions: Actually increases, since the molecules are now closer together and moving faster due to the increased pressure.
C) Number of molecules present: Remains the same, since the mass of the gas is unchanged.
D) Atomic radius of each particle: Remains the same, since the atomic radius is a property of the individual atoms and is not affected by changes in the gas's volume or pressure.
