The
correct answer is A. In the combined gas law, if the volume is decreased and
the pressure is constant, then the temperature decreases.
 P1V1/
T1 = P2V2 / T2
 Assume
the volume decrease by half; V2 = V1/2
 P1V1/
T1 = P2V1 /2 T2
 Cancelling
terms,
 1/T1
= 1/2 T2
T2
= T1/2
 Thus,
the temperature decreased.
