First slide

Gaseous state

Question

If a gas expands at constant temperature:

Moderate

A

the pressure decreases
B

the kinetic energy of the molecules remains the same
C

the K.E. of the molecules decrease
D

the number of molecules of the gas increase

Solution

PV = nRT
T =Constant
PV =constant
$V ↑\Rightarrow P ↓$
KE is a function of temperature.

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