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Equilibrium And Equations
Test Description: Remember LeChatelier's Principle! And AARK for balancing rxns
Instructions: Answer all questions to get your test result.
1) In a sealed bottle that is half full of water, equilibrium will be attained when water molecules
A
cease to evaporate
B
begin to condense
C
evaporate and condense at equal rates. CSC00152
D
are equal in number for both the liquid and the gas phase.
2) NO2 (g) + CO (g) <-> NO (g) + CO2 (g) // What action will shift the rxn to the left?
A
increasing the NO concentration in the flask
B
pumping CO gas into the closed flask
C
venting some CO2 gas from the flask
D
raising the total pressure inside the flask
3) NH4Cl (s) + heat <--> NH3 (g) + HCl (g) // What kind of change will shift the rxn to the right?
A
a decrease in temperature
B
an increase in the pressure of NH3
C
an increase in the concentration of HCl
D
a decrease in total pressure
4) When a reaction is at equilibrium and more reactant is added, which of the following changes is the immediate result?
A
The forward reaction rate increases
B
The forward reaction rate remains the same.
C
The reverse reaction rate remains the same.
D
The reverse reaction rate decreases.
5) In which of the following reactions involving gases would the forward reaction be favored by an increase in pressure
A
A + B <--> C + D
B
AC <--> A + C
C
2A + B <--> C + 2D
D
A + B <--> AB
6) H2O2, hydrogen peroxide, decomposes to H2O and O2. If you add MnO2, the activation energy decreases and reaction rate increases. Why?
A
MnO2 is an enhancer
B
MnO2 is a catalyst
C
MnO2 is an inhibitor
D
Mn O2 is a reactant
7) 4 HCl (g) + O2(g) <--> 2 H2O (l) + 2 Cl2 (g) + 113 kJ // Which action will shift the rxn right?
A
decreasing the oxygen concentration
B
adding water to the system
C
increasing the system's pressure
D
heating the equilibrium mixture
8) When NH3 combines with O2 to make N2 and H2O, the coefficient for NH3 in the balanced rxn is
A
4
B
3
C
6
D
2
9) C3H8 + O2 -> CO2 + H2O // Balance this rxn. The coeffficient for water is
A
2
B
8
C
4
D
16
10) Which of the following is a balanced equation for the combustion of ethanol (CH3CH2OH)?
A
CH3CH2OH + 3 O2 --> CO2 + 2 H2O
B
CH3CH2OH + 3 O2 --> 2 CO2 + 3 H2O
C
CH3CH2OH + O2 --> 2 CO2 + 3 H2O
D
CH3CH2OH + 2 O2 --> 3 CO2 + 2 H2O
*select an answer for all questions
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