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Magazine Chapter 12: Kinetics
Q70E.
Define these terms: (a) unimolecular reaction (b) bimolecular reaction (c) elementary reaction (d) overall reaction.
Q71 E
What is the rate equation for the elementary termolecular reaction A + 2B鉄秔roducts? For 3A鉄秔roducts?
Q75E.
Experiments were conducted to study the rate of the reaction represented by this equation.(2)\({\rm{2NO(g) + 2}}{{\rm{H}}_{\rm{2}}}{\rm{(g) }} \to {\rm{ }}{{\rm{N}}_{\rm{2}}}{\rm{(g) + 2}}{{\rm{H}}_{\rm{2}}}{\rm{O(g)}}\)Initial concentrations and rates of reaction are given here.
| Experiment | Initial Concentration \(\left( {{\bf{NO}}} \right){\rm{ }}\left( {{\bf{mol}}/{\bf{L}}} \right)\) | Initial Concentration, \(\left( {{{\bf{H}}_{\bf{2}}}} \right){\rm{ }}\left( {{\bf{mol}}/{\bf{L}}} \right)\) | Initial Rate of Formation of \({{\bf{N}}_{\bf{2}}}{\rm{ }}\left( {{\bf{mol}}/{\bf{L}}{\rm{ }}{\bf{min}}} \right)\) |
| 1 | \({\bf{0}}.{\bf{0060}}\) | \({\bf{0}}.{\bf{00}}1{\bf{0}}\) | \({\bf{1}}.{\bf{8}} \times {\bf{1}}{{\bf{0}}^{ - {\bf{4}}}}\) |
| 2 | \({\bf{0}}.{\bf{0060}}\) | \({\bf{0}}.{\bf{00}}2{\bf{0}}\) | \({\bf{3}}.{\bf{6}} \times {\bf{1}}{{\bf{0}}^{ - {\bf{4}}}}\) |
| 3 | \({\bf{0}}.{\bf{00}}1{\bf{0}}\) | \({\bf{0}}.{\bf{0060}}\) | \({\bf{0}}.{\bf{30}} \times {\bf{1}}{{\bf{0}}^{ - {\bf{4}}}}\) |
| 4 | \({\bf{0}}.{\bf{00}}2{\bf{0}}\) | \({\bf{0}}.{\bf{0060}}\) | \({\bf{1}}.{\bf{2}} \times {\bf{1}}{{\bf{0}}^{ - {\bf{4}}}}\) |
Consider the following questions:(a) Determine the order for each of the reactants, \({\bf{NO}}\) and \({{\bf{H}}_{\bf{2}}}\), from the data given and show your reasoning.(b) Write the overall rate law for the reaction.(c) Calculate the value of the rate constant, k, for the reaction. Include units.(d) For experiment 2, calculate the concentration of \({\bf{NO}}\)remaining when exactly one-half of the original amount of \({{\bf{H}}_{\bf{2}}}\) had been consumed.(e) The following sequence of elementary steps is a proposed mechanism for the reaction.Step 1:Step 2:Step 3:Based on the data presented, which of these is the rate determining step? Show that the mechanism is consistent with the observed rate law for the reaction and the overall stoichiometry of the reaction.
Q77E.
Account for the increase in reaction rate brought about by a catalyst.
Q78E.
Compare the functions of homogeneous and heterogeneous catalysts.
Q7E
Describe the effect of each of the following on the rate of the reaction of magnesium metal with a solution of hydrochloric acid: the molarity of the hydrochloric acid, the temperature of the solution, and the size of the pieces of magnesium.
Q80E.
For each of the following pairs of reaction diagrams, identify which of the pair iscatalyzed:
Q83E.
For each of the following reaction diagrams, estimate the activation energy \(\left( {{E_a}} \right)\)of the reaction:
Q9E
Go to the PhET Reactions & Rates interactive. Use the Single Collision tab to represent how the collision between monatomic oxygen (O) and carbon monoxide (CO) results in the breaking of one bond and the formation of another. Pull back on the red plunger to release the atom and observe the results. Then, click on 鈥淩eload Launcher鈥� and change to 鈥淎ngled shot鈥� to see the difference.
- What happens when the angle of the collision is changed?
- Explain how this is relevant to rate of reaction.
