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- 1. Multiple Choice2A + 3B <----> 2AB
The forward reaction forms the substance __________.ABABA + B - 2. Multiple ChoiceFor the reaction...
SO2 + O2 <−> SO3
If the concentration of SO2 is increased, the equilibrium of the reaction will shift ___________.leftrightleft and rightneither left nor right - 3. Multiple ChoiceFor the reaction...
SO2 + O2 <−> SO3
If the equilibrium shifts to the right, the concentration of O2 will ___________.increasedecreaseremain the samedouble - 4. Multiple ChoiceFor the reaction...
heat + N2 + O2 <−> 2NO
If NO is removed from the system, the concentration of N2 will _______.increasedecreaseremain the samedouble - 5. Multiple ChoiceFor the reaction...
H2 (g) + Cl2 (g) <−> 2HCl (g) + heat
If the temperature is cooled, the _________ reaction will be favored.forwardreverseforward and reverse - 6. Multiple ChoiceFor the reaction...
N2 (g) + 3 H2 (g) <−> 2 NH3 (g)
If the pressure in the system is increased, which substance will increase in concentration?N2H2N2 and H2NH3 - 7. Multiple Choice
What is the effect of increasing the pressure on the following equilibrium: 2NO(g) + O2 (g) ⇌2NO2(g)?
The yield of NO2 increases
The yield of NO2 decreases
The reaction is slower
The concentration of O2 increases.
- 8. Multiple ChoiceWhich of the following is NOT true at equilibrium?The forward and reverse reactions proceed at the same rate.The concentrations of reactants and products do not change.The concentration of the reactants is equal to the concentration of the products.The forward and reverse reactions continue to occur.
- 9. Multiple Choice
At what time the reaction reached equilibrium?t1t2t3t4 - 10. Multiple ChoiceHow do catalysts increase the rate of reaction?The frequency of collisions is the increasedthe activation energy is loweredthe energy of collisions is increasedBoth the frequency and energy of collisions is increased
- 11. Multiple Choice
At elevated temperatures ammonium carbonate, NH2COONH4, is in equilibrium with NH3 and CO2 according to the equation;
NH2COONH4(s) ↔ 2 NH3(g) + CO2(g)
What is the equilibrium expression for this reaction?
K = 2 [NH3][CO2]
[NH2COONH4]
K = [NH3]2[CO2]
[NH2COONH4]
K = 2 [NH3][CO2]
K = [NH3]2[CO2]
- 12. Multiple Choice2SO2(g)+O2(g)⇌2SO3(g)
Decreasing volume of container willshift equilibrium rightshift equilibrium leftchange Khave no change - 13. Multiple Choice
For the following reaction: H2(g) + Cl2 (g) ↔ 2HCl(g), calculate the concentration of HCl when Keq= 2.3x10-5, [H2]= 0.0056mol, [Cl2]= 0.0048mol.
6.2 x 10-10 M
2.5 x 10-5 M
1.1 M
1.2 M
- 14. Multiple Choice
PCl3 (g) + Cl2 (g) ↔ PCl5 (g) + energy
Which of the following causes an increase in the moles of PCl5 present at equilibrium shown?
decreasing the volume of the container
raising the temperature
adding a mole of He gas at constant volume
adding a mole of He gas at constant pressure
- 15. Multiple Choice
What kind of equilibrium does the reaction below show?
H2(g) +I2(g) ↔ 2HI(g)
Heterogeneous equilibrium, all the reactants and products are in the same physical state.
Homogeneous equilibrium, all the reactants and products are in the same physical state.
Heterogeneous equilibrium, the reactants and products are present in more than one physical state
Homogeneous equilibrium, the reactants and products are present in more than one physical state
- 16. Multiple ChoiceFor the reaction...
heat + N2 + O2 <−> 2NO
If the heat is removed from the chemical system, the concentration of N2 will _______.increasedecreaseremain the samedouble - 17. Multiple ChoiceFor the reaction...
H2 (g) + Cl2 (g) <−> 2HCl (g) + heat
If the pressure in the system is increased, the equilibrium will _______.shift leftshift rightnot shift - 18. Multiple Choice
H2(g)+Cl2(g)⇌2HCl(g)
The forward reaction is exothermic. What will happen to the equilibrium if the temperature is increased?
equilibrium shifts right
equilibrium shifts left
You cannot predict the effect
no change
- 19. Multiple ChoiceIdentify the labels (a) and (b) on the graph.a is concentration of reactants and b is the concentration of producta is concentration of product and b is the concentration of reactanta is the volume of reactants and b is the volume of producta the mass of reactants and b is the mass of product
- 20. Multiple ChoiceWhich of the two graphs reaches equilibrium?The left one.The right one.Both of them.Neither.
- Answer choicesTagsAnswer choicesTags