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| 1 | |
When does the rate of the forward reaction of a reversible reaction decrease? |
| | A) | when the temperature is increased |
| | B) | when the initial concentration of the reactants increases |
| | C) | when the rate of the reverse reaction increases |
| | D) | when the rate of the reverse reaction remains constant |
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| 2 | |
What is the equilibrium expression for the following reaction?
4NH3(g) + 5O2(g) ⇔ 4NO(g) + 6H2O(g)
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| | A) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070938539/128791/ATLCHEMISTRY_CH13_QUIZ2_Q2a.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (2.0K)</a>]]>
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| | B) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070938539/128791/ATLCHEMISTRY_CH13_QUIZ2_Q2b.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (2.0K)</a>]]>
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| | C) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070938539/128791/ATLCHEMISTRY_CH13_QUIZ2_Q2c.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (3.0K)</a>]]>
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| | D) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070938539/128791/ATLCHEMISTRY_CH13_QUIZ2_Q2d.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (3.0K)</a>]]>
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| 3 | |
What is the reaction equation that corresponds to the following equilibrium expression?
 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070938539/128791/ATLCHEMISTRY_CH13_QUIZ2_Q3.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (2.0K)</a>]]>
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| | A) | 2SO3(g) ⇔ 2O2 + 2SO2(g)
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| | B) | 2O2 + 2SO2(g) ⇔ 2SO3(g)
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| | C) | O2 + 2SO2(g) ⇔ 2SO3(g)
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| | D) | 2SO3(g) ⇔ O2 + 2SO2(g) |
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| 4 | |
The following reaction took place at a certain temperature in a 12.5 L flask. If the concentrations at equilibrium are [SO3] = 2.33 mol/L, [O2] = 1.23 mol/L, and [SO2] = 0.433 mol/L, what is the equilibrium constant?
2SO3(g) = O2(g) + 2SO2(g)
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| | A) | 0.234 |
| | B) | 0.229 |
| | C) | 23.5 |
| | D) | 0.0425 |
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| 5 | |
Which of the following statements is not correct? |
| | A) | The equilibrium constant can be calculated by multiplying the concentrations of products, and then dividing by the concentrations of reactants. |
| | B) | The intensity of the colour of a solution is related to the concentration of the ions and the depth of the solution. |
| | C) | Colour, pH, and pressure are properties that can be measured to help determine the concentrations of substances in reactions at equilibrium. |
| | D) | The equilibrium constant of a reaction can be calculated without knowing the initial concentrations as long as the final concentrations of the reactants and products are known. |
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| 6 | |
In which circumstance are reactants favoured and does the equilibrium of the reaction lie far to the left? |
| | A) | When the value of Kc is very large |
| | B) | When the value of Kc is equal to one |
| | C) | When the value of Kc is very small |
| | D) | When the value of Kc cannot be calculated |
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| 7 | |
Which of the following equilibrium constant values indicates products are in excess in a reaction mixture at equilibrium? |
| | A) | 1.2 x 10-2 |
| | B) | 1.2 x 10-5 |
| | C) | 0 |
| | D) | 1.2 x 105 |
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| 8 | |
When may the change in concentration, x, be ignored to help simplify equilibrium calculations? |
| | A) | When Kc is small compared to the initial concentration |
| | B) | When Kc is large compared to the initial concentration |
| | C) | When the initial concentration of a substance is zero |
| | D) | Never |
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