第 1 题
1 分What is the correct definition of activation energy, \( E_a \)?
Cambridge International A Level · Chemistry (9701)
Reaction kinetics (AS)：练习题
5 道选择题即时批改，另有 5 道文字题附完整解题步骤，全部围绕「Reaction kinetics (AS)」。
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第 2 题
1 分The decomposition of a reactant X follows first-order kinetics. If the initial concentration of X is \(0.80 \text{ mol dm}^{-3}\) and its half-life is 20 minutes, what will the concentration of X be after 60 minutes?
第 3 题
1 分In the oxidation of iodide ions by peroxodisulfate ions, \( S_2O_8^{2-} + 2I^- \to 2SO_4^{2-} + I_2 \), the reaction is catalysed by \( Fe^{2+}(aq) \).
Which set of equations correctly represents the homogeneous catalysis mechanism?
第 4 题
1 分In the reaction between methane and chlorine, the first step is the homolytic fission of the \(Cl-Cl\) bond by ultraviolet light to form chlorine radicals. Which term best describes the minimum energy required for this specific step to occur effectively?
第 5 题
1 分The reaction between hydrogen and nitrogen(II) oxide follows the rate equation: \( \text{rate} = k[NO]^2[H_2] \).
The following mechanism is proposed:
Step 1: \( 2NO \rightleftharpoons N_2O_2 \) (fast equilibrium)
Step 2: \( N_2O_2 + H_2 \to N_2O + H_2O \) (slow)
Step 3: \( N_2O + H_2 \to N_2 + H_2O \) (fast)
Why is the reaction second-order with respect to NO?
第 6 题
2 分Define the term activation energy, \(E_a\), for a chemical reaction.
先自己写一遍答案，再对照解题步骤。
第 7 题
4 分Using the Boltzmann distribution, explain qualitatively why a small increase in temperature leads to a significant increase in the rate constant, \( k \).
先自己写一遍答案，再对照解题步骤。
第 8 题
5 分Describe the specific role of adsorption and desorption in the catalytic removal of oxides of nitrogen using a platinum-based catalytic converter in car engines.
先自己写一遍答案，再对照解题步骤。
第 9 题
4 分(a) Define the term rate of reaction. [1]
(b) Use the collision theory to explain why increasing the temperature of a reaction mixture increases the rate of reaction. [3]<\/p>
先自己写一遍答案，再对照解题步骤。
第 10 题
5 分The reaction between reactant X and reactant Y was studied at \(298\text{ K}\). The following experimental data were obtained:
| Experiment | Initial [X] / \(\text{mol dm}^{-3}\) | Initial [Y] / \(\text{mol dm}^{-3}\) | Initial rate / \(\text{mol dm}^{-3}\text{ s}^{-1}\) |
|---|---|---|---|
| 1 | 0.150 | 0.100 | \(1.20 \times 10^{-4}\) |
| 2 | 0.300 | 0.100 | \(4.80 \times 10^{-4}\) |
| 3 | 0.300 | 0.200 | \(9.60 \times 10^{-4}\) |
(a) Deduce the order of reaction with respect to X and the order of reaction with respect to Y. Show your reasoning. [2]
(b) Construct the rate equation for this reaction. [1]
(c) Calculate the value of the rate constant, \(k\), for Experiment 1 and state its units. [2]
先自己写一遍答案，再对照解题步骤。
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