Chem 1B Lab Quizzes Questions With Complete Solutions

Chem 1B Lab Quizzes Questions With Complete Solutions


Consider the given gaseous system at equilibrium in a closed,
rigid container.

N2O4(g)−⇀↽−2NO2(g) ΔH=+57.2

Determine how each change with shift the system to reestablish
equilibrium.
Decreasing the volume of the container
Removing NO2
Increasing temperature
adding N2O4
Shift toward reactant side

Shift toward product side

Shift toward product side

Shift toward product side
Consider the system of copper complexes at equilibrium.

Cu(H2O)42+(aq)+4NH3(aq)−⇀↽−Cu(NH3)42+(aq)+4H2O(l)

Determine how each change with shift the system to reestablish
equilibrium.

,Adding HCl
Removing Cu(NH3)42+
Adding Cu(H2O)42+
Adding H2O
shift toward reactant side
shift toward product side
shift toward product side
no impact
Consider an endothermic equilibrium system involving gases
and solids in a closed, expandable container kept at constant
pressure.
A(s)−⇀↽−B(g)+C(g)
Which changes will cause the equilibrium to shift?
Select one or more:
Addition of solid A
Addition of an inert gas
Increase in temperature
Removal of gaseous B
c
Addition of an inert gas
Increase in temperature
Removal of gaseous B
c

, A change in temperature can shift an equilibrium system.
To determine the impact of temperature, use the _______ to
determine whether the reaction is endothermic or exothermic. If
the reaction is endothermic, treat heat as a _______ in
equillibrium. If the reaction is exothermic, treat heat as a _____
in the equilibrium.
sign of the enthalpy change
reactant
product
Consider the two reactions of iron ions, one with thiocyanate (
SCN−) ions and one with chloride ons.


Fe3++SCN−−⇀↽−FeSCN2


Fe3++4Cl−⟶FeCl4−

If you create an equilibrium mixture from
Fe3+
and
SCN−
ions, adding
Cl−
ions will remove the
Fe3+
from the equilibrium mixture and will cause the reaction to