In which of the following systems would the equilibrium NOT be shifted by a change in the volume of the system at constant temperature? (A) CO(g) + NO(g) ⇄ CO2(g) + 1/2 N2(g) (B) N2(g) + 3 H2(g) ⇄ 2 NH3(g) (C) N2(g) + 2 O2(g) ⇄ 2 NO2(g) (D) N2O4(g) ⇄ 2 NO2(g) (E) NO(g) + O3(g) ⇄ NO2(g) + O2(g)
Just solve questions 2-6, thanks.
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1 |
HgO(s) + 2 I−(aq) + H2O(l) ⇄ HgI2(g) + 2 OH−(aq) ; ∆H < 0 Consider the equilibrium above. Which of the following changes will increase the concentration of HgI2? (A) Increasing the concentration of OH− (B) decreasing the pressure (C) Increasing the mass of HgO present (D) Increasing the temperature (E) Adding a catalyst |
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2 |
In which of the following systems would the equilibrium NOT be shifted by a change in the volume of the system at constant temperature? (A) CO(g) + NO(g) ⇄ CO2(g) + 1/2 N2(g) (B) N2(g) + 3 H2(g) ⇄ 2 NH3(g) (C) N2(g) + 2 O2(g) ⇄ 2 NO2(g) (D) N2O4(g) ⇄ 2 NO2(g) (E) NO(g) + O3(g) ⇄ NO2(g) + O2(g) |
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3. |
What substance is missing in the following reaction mechanism? Step 1 NO + ___ à OONO Step 2 NO + OONO à 2NO2 Overall 2NO + O2 à 2NO2 (A) O2 (B) NO2 (C) NO (D) OONO |
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4 |
Relatively slow rates of (A) The presence of a catalyst (B) High temperature (C) High concentration of reactants (D) Weak bonds in reactant molecules (E) High activation energy |
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5 |
Consider the potential energy diagram. Which of the following is true for the reverse reaction? A. catalysed ∆Hrev= +50kJ Earev =+150kJ B. catalysed ∆Hrev= -50kJ Ea=+50kJ C. uncatalysed ∆Hrev= +50kJ Ea=+150kJ D. uncatalysed ∆H= -50kJ Ea=+150kJ |
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6 |
Considering enthalpy and entropy, which of the following describes the reaction: A(g) + B(s) + kJ ↔ C(aq) + D(aq) A. the reaction goes forward C. the reaction goes in reverse B. the reaction will not proceed D. there will be an explosion E. the reaction is at equilibrium |
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7 |
Given that the reaction H3AsO4 + 3I−+ 2 H3O+ à H3AsO3 + I3− + H2O has a ka expression as follows: Ka = [H3AsO3][I3-] [I-]3[H3O]2 If the concentration of H3AsO4 if increased... A) the equilibrium will shift to toward the products. B) the equilibrium will shift toward the reactants C) there will be no shift in equilibrium. |
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8 |
Which statement concerning factors affecting A. Decreasing the concentration of the reactants decreases the chance of collision. B. Decreasing the volume of a reaction flask containing gaseous reactants increases the chance of collision. C. A reaction occurs with every collision between particles. D. Increasing the temperature increases the reaction rate. |
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9 |
Equilibrium is a state of dynamic molecular behaviour, meaning that: A) the reaction eventually comes to a stop. B) reactants continually turn into products at a progressively slower rate. C) products continually turn into reactants at a progressively faster rate. D) reactants turn into products and products turn into reactants at different rates. E) reactants turn into products and products turn into reactants at equal rates. |
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10 |
Adding Fe(NO3)3(aq) to the above reaction will cause: A) the color to turn a deeper red because the equilibrium shifted to make more reactants. B) The color to turn a deeper red because the equilibrium shifted to make more products. C) The color to become a lighter yellow because the equilibrium shifted to make more reactants. D) The color to become a lighter yellow because the equilibrium shifted to make more products. E) None of the above are correct. |
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