Analytical Chemistry: Equilibrium Concept
Quiz
•
Chemistry
•
11th Grade - University
•
Hard
Morgan Rat
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15 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
For the equilibrium reaction 2SO2 (g) + O2 (g) ⇌ 2SO3 (g), ΔHºrxn= –198 kJ/mol. Which one of these factors would cause the equilibrium constant to increase?
Decrease the temperature.
Remove O gas.
Add SO gas.
None of these.
Add a catalyst.
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
The Kc for the reaction CO2 (g) + H2 (g) ⇌ H2O(g) + CO(g) is 1.6 at about 990ºC. Calculate the number of moles of hydrogen gas in the final equilibrium system obtained by initially adding 1.00 mol of H2, 2.00 mol of CO2, 0.750 mol of H2O, and 1.00 mol of CO to a 5.00 L reactor at 990ºC.
0.62 mol
1.02 mol
0.42 mol
none of the above
0.82 mo
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Calculate K for the reaction 2HI(g) ⇌ H2 (g) + I2 (g) given that the concentrations of each species at equilibrium are as follows: [HI] = 0.85 mol/L, [I2] = 0.60 mol/L, [H2] = 0.27 mol/L.
4.5
5.25
1.6 × 102
0.22
0.19
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
For the following reaction at equilibrium, which gives a change that will shift the position of equilibrium to favor the formation of more products? 2NOBr(g) ⇌ 2NO(g) + Br2(g), ΔHºrxn= 30 kJ/mol
Remove Br2
Remove NOBr selectively
Lower the temperature.
Increase the total pressure by decreasing the volume.
Add more NO.
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Consider the gas-phase equilibrium system represented by the equation: 2H2O(g) ⇌ 2H2 (g) + O2 (g)
Given that the forward reaction is endothermic, which of the following changes will decrease the equilibrium amount of H2O?
adding more oxygen
decreasing the volume of the container
adding He gas
increasing the temperature at constant pressure
adding a solid phase calalyst
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
In which of these gas-phase equilibria is the yield of products increased by increasing the total pressure on the reaction mixture?
H2 (g) + I2 (g) ⇌ 2HI(g)
PCl5 (g) ⇌ PCl3 (g) + Cl2 (g)
2SO3 (g) ⇌ 2SO2 (g) + O2 (g)
CO(g) + H2O(g) ⇌ CO2(g) + H2(g)
2NO(g) + Cl2(g) ⇌ 2NOCl(g)
7.
FILL IN THE BLANK QUESTION
2 mins • 1 pt
The equilibrium between carbon dioxide gas and carbonic acid is very important in biology and environmental science.
CO2(aq) + H2O (l) ⇌ H2CO3 (aq)
Which one of the following is the correct equilibrium constant expression (Kc) for this reaction?
Type as: Kc = [X2Y3][AB2]/[ZC][X2B]
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