Ap Chemistry Chapter 16 Multiple Choice Quiz Review With Answers - Malea Mullins, University School Of Jackson Page 7
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14For questions 21-23, consider the following system at equilibrium at 25°C:
(g) PCl
(g) for which ΔH° = 92.5 kJ at 25°C.
PCl
(g) + Cl
3
2
5
21.
If the temperature of the system is raised, the ratio of the partial pressure of PCl
to the
5
partial pressure of PCl
will a.
increase.
3
b.
decrease.
c.
stays the same.
d.
impossible to tell without more information.
The reaction is exothermic so heat can be thought of as a product. According to
LeChatelier's Principle, the reaction will shift back to the left away from the added
substance (heat). Therefore, the partial pressure of PCl
to the partial pressure of PCl
5
3
will decrease.
22.
When some Cl
(g) is added at constant volume and temperature, the ratio of the partial
2
pressure of PCl
to the partial pressure of PCl
will
5
3
a.
increase.
b.
decrease.
c.
stays the same.
d.
impossible to tell without more information.
Chlorine is added. According to LeChatelier's Principle, the reaction will shift to the
right away from the added substance (chlorine). Therefore, the partial pressure
of PCl
to the partial pressure of PCl
will increase.
5
3
23.
When the volume is decreased at constant temperature, the ratio of the partial pressure of
PCl
to the partial pressure of PCl
will
5
3
a.
increase.
b.
decrease.
c.
stays the same.
d.
impossible to tell without more information.
According to LeChatelier's Principle, when the volume is decreased, the reaction will
shift towards the side with the lowest gaseous moles. In this case, the reaction will shift
right. Therefore, the partial pressure of PCl
to the partial pressure of PCl
will increase.
5
3
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