Equlibrium Question Preview (ID: 18343)


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HNO2 (aq) ↔ H+ (aq) + NO2¯ (aq) Which of the following will have the same effect as increasing the concentration of H?
a) increaseing the HNO2 concentration
b) decreasing the HNO2 concentration
c) increasing the volume
d) decreasing the pressure

Which of the following are included in the equilibrium expression for the following equilibrium reaction : AgBr (s) ↔ Ag+ (aq) + Br¯ (aq)
a) all are included
b) only the reactants
c) only the products
d) only AgBr and Ag

N2 (g) + 3 H2 (g) ↔ 2 NH3 (g) : which of the following is NOT included in the equilibrium expression?
a) all are included
b) only the reactants
c) only the products
d) only N2 and NH3

Into a 2.00 L container is placed 1.00 mol of SO2(g) and 1.00 mol of O2(g). At equilibrium, SO3 = 0.150 M. Calculate the equilibrium constant for this reaction. 2 SO2(g) + O2(g) ⇄ 2 SO3(g) (HINT: you will need an ice table to solve)
a) 0.432
b) 0.0317
c) 0.0029
d) 31.5

When 0.50 mol of NOCl was put into a 1.0 L flask and allowed to reach equilibrium, 0.10 mol of Cl2 was found. What is Keq for this reaction? 2 NOCl(g) ⇄ 2 NO(g) + Cl2(g) (HINT: You will need an ice table to solve!)
a) 22.5
b) 2.55
c) 0.067
d) 0.044

A reaction vessel had 1.95 M CO and 1.25 M H2O. The equilibrium reaction is: CO + H2O ⇄ CO2 + H2. At equilibrium 0.85 M CO2 was present. What is the equilibrium constant for the reaction? (HINT: you will need to make an ice table)
a) 0.61
b) 1.64
c) 3.17
d) none of the above are correct

2 NO2(g) ⇄ N2O4(g) If the pressure of the system is decreased, in which direction will equilibrium shift?
a) right
b) left
c) equilibrium will not shift
d) cannot tell without more information

2 NO2(g) ⇄ N2O4(g) + heat In which direction will the equilibrium shift if the temperature of the system is decreased?
a) cannot tell without more information
b) will not shift
c) left
d) right

2 NO2(g) ⇄ N2O4(g) In which direction will the equilibrium shift if the volume of the system is decreased?
a) right
b) left
c) equilibrium will not shift
d) need more information to determine

2 NO2(g) ⇄ N2O4(g) In which directions will the equilibrium shift if more NO is added?
a) right
b) left
c) equilibrium will not shift
d) need more information to determine

Which of the following will change the value of the equilibrium constant?
a) changing the temperature
b) adding other substances that do not react with anything
c) varying the volume of the vessle
d) varying the pressure of the vessle

At equilibrium a 2.0L flask contains: 0.075 mol of PCl5 0.050 mol of H2O 0.750 mol of HCl 0.500 mol POCl3 Calculate the Keq for the reaction: PCl5 (s) + H2O (g) ⇄ 2HCl (g) + POCl3 (g)
a) 3.75
b) 0.711
c) 1.41
d) none of the above

SO3(g) + H2O(g) ⇄ H2SO4(l) At equilibrium SO3 = 0.400M H2O = 0.480M H2SO4 = 0.600M Calculate the value of the equilibrium constant.
a) 3.125
b) 5.21
c) 0.192
d) none of the above

Which of the following are NOT included in the equilibrium expression?
a) aqueous
b) all are included
c) solids and liquds
d) gases

When the temperature of a system is increased, the equilibrium will shift...
a) the equilibrium will not shift
b) Cannot determine from the information given
c) the side with the most moles
d) the side with the fewest moles

When the concentration of a reactant is increased, the equilibrium will shift
a) to the right
b) to the left
c) cannot not determine without a reaction
d) will NOT shift

When the volume of a system is increased, the equilibrium will shift...
a) the equilibrium will not shift
b) Cannot determine from the information given
c) the side with the most moles
d) the side with the fewest moles

The concentration of the reactants in an equilibrium equation...
a) remain constant
b) increase
c) decrease
d) increase then decrease

What reactions are used in determining the equilibrium constant
a) forward
b) reverse
c) both forward and reverse
d) neither forward nor reverse

When the pressure of a equilibrium system is increased, the equilibrium will shift
a) the equilibrium will not shift
b) Cannot determine from the information given
c) the side with the most moles
d) the side with the fewest moles

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