# Equilibrium And Equations: Question Preview (ID: 1969)

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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) are equal in number for both the liquid and the gas phase.
d) evaporate and condense at equal rates. CSC00152

NO2 (g) + CO (g) <-> NO (g) + CO2 (g) // What action will shift the rxn to the left?
a) pumping CO gas into the closed flask
b) raising the total pressure inside the flask
c) increasing the NO concentration in the flask
d) venting some CO2 gas from the flask

NH4Cl (s) + heat <--> NH3 (g) + HCl (g) // What kind of change will shift the rxn to the right?
a) a decrease in total pressure
b) an increase in the concentration of HCl
c) an increase in the pressure of NH3
d) a decrease in temperature

When a reaction is at equilibrium and more reactant is added, which of the following changes is the immediate result?
a) The reverse reaction rate remains the same.
b) The forward reaction rate increases
c) The reverse reaction rate decreases.
d) The forward reaction rate remains the same.

In which of the following reactions involving gases would the forward reaction be favored by an increase in pressure
a) A + B <--> AB
b) A + B <--> C + D
c) 2A + B <--> C + 2D
d) AC <--> A + C

H2O2, hydrogen peroxide, decomposes to H2O and O2. If you add MnO2, the activation energy decreases and reaction rate increases. Why?
a) MnO2 is a catalyst
b) MnO2 is an enhancer
c) MnO2 is an inhibitor
d) Mn O2 is a reactant

4 HCl (g) + O2(g) <--> 2 H2O (l) + 2 Cl2 (g) + 113 kJ // Which action will shift the rxn right?
a) heating the equilibrium mixture
b) adding water to the system
c) decreasing the oxygen concentration
d) increasing the system's pressure

When NH3 combines with O2 to make N2 and H2O, the coefficient for NH3 in the balanced rxn is
a) 2
b) 3
c) 4
d) 6

C3H8 + O2 -> CO2 + H2O // Balance this rxn. The coeffficient for water is
a) 2
b) 4
c) 8
d) 16

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

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