Answer to Question #60126 in Physical Chemistry for joseph orobiyi

Question

18 When extra NH3 is added to the following system at equilibrium:
$3H_2(g) + N_2(g) \rightarrow 2 NH_3(g)$, what happens?
In order to restore equilibrium, the reaction shifts left, toward
reactants
In order to restore equilibrium, the reaction shifts right, toward product
No change occurs
Concentration of hydrogen decreases, but that of hydrogen increases



19 A beaker with a mixture of ice and water is maintained at
equilibrium: $H_2O(s) + heat \rightarrow H_2O(l)$; If the temperature of
the system is decreased:
Water freezes to form ice (shifts to the left)
Ice melts to form liquid water (shift to the right)
The container cacks
No change occurs



20 For the following system at equilibrium, what will cause the partial
pressure of HF to increase? $UO_2(s) + 4 HF(g) \rightarrow UF_4(g) + 2
H_2O(g)$
adding $UO_2$(s)
adding $UF_4(g)$
decreasing the pressure
removing $H_2O(g)$

Answer 1

18. In order to restore equilibrium, the reaction shifts left, towards reactants.
19. Water freezes to form ice - shift to the left.
20. Adding of UF4 will cause the rising of partial pressure of HF.