An equilibrium constant is not changed by a change in pressure.

True or False

True

Explanation:

Only temperature changes the value of the equilibrium constant.

For any system in equilibrium, the molar concentration of all the species on the right side are related to the molar concentration of the species on the left side by the equilibrium constant .

The equilibrium constant is a constant at a given temperature. It is temperature dependent.A shift in equilibrium as a result of temperature change is actually a change in the value of the equilibrium constant.

B) Bill's wagon is moving 4 times faster than Tom's.

Explanation:

The motion of the wagons is determined by the net force that acts upon them, according to Newton's second law of motion:

Force = mass × acceleration ⇒ acceleration = Force / mass

From your data, you can fill this table to compare the accelerations:

                          Bill's wagon   Tom's wagon

mass (lb)                 10                      20

force                       2F                      F

acceleration           2F/10                 F/20

Find the ratio between both accelarations:

Bill's wagon acceleration / Tom's wagon acceleration(2F/10) / (F/20) = (2 × 20 / 10 ) = 4

Meaning that the acceleration of Bill's wagon is 4 times the acceleration of Tom's wagon.

Assuming, that both wagons start from rest, you can obtain the speeds from the kinematic equation for uniformly accelerated motion:

Speed = acceleration × time, V = a × t.

Call the acceleration of Tom's wagon X, then the acceleration of Bill's wagon will be 4X.

So, depending on the time, using V = a × t, the speeds will vary:

t (s)                                      1         2         3        4

Speed Tom's wagon         X        2X      3X     4X  

Speed Bill's wagon           4X      8X     12X    16X

Concluding that Bill's wagon is moving 4 times faster than Tom's (option B).