In the combined gas law, if the volume is decreased, what happens to the temperature if pressure remains constant?
a. the temperature decreases.
b. the temperature increases.
c. the temperature remains the same.

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.

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each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.