Kinetics multiple choice questions – A-Level Chemistry (Edexcel International)

1 of 26

Two reactions are shown.

Reaction 1: N_2(g) + 3H_2(g) ⇌ 2NH_3(g)

Reaction 2: 2O_3(g) ⇌ 3O_2(g)

In reaction 1, a finely powdered iron catalyst is used.

In reaction 2, a vaporised tetrachloromethane catalyst in ultraviolet light is used.

Which statement about the catalysts used is correct?

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2 of 26

Hydrogen ions catalyse the hydrolysis of esters.

Which statement is correct?

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3 of 26

The following statements are about the reaction of NaOH_(aq) with the three chloroalkanes shown.

CH₃CH₂CHCl CH₃ (CH₃)₂CHCH₂Cl (CH₃)3CCl

Which statement is correct?

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4 of 26

An organic ion containing a carbon atom with a negative charge is called a carbanion.

An organic ion containing a carbon atom with a positive charge is called a carbocation.

The reaction between aqueous sodium hydroxide and 1-bromobutane proceeds by an S_N2 mechanism.

What is the first step in the mechanism?

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5 of 26

The equation shows the hydrolysis of a bromoalkane.

RBr + OH^- ➔ ROH + Br^-

The rate equation is rate = k[RBr]

RBr is most likely to be

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6 of 26

A reactant Q is converted into two products.

Which of these graphs shows that this reaction is first order with respect to Q?

Four graphs showing concentration of reactant Q versus time, and rate versus concentration of Q to determine first order reaction.

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7 of 26

To determine the activation energy, E_a , for a reaction, a graph was plotted of ln k against 1/T, where k is the rate constant.

The Arrhenius equation is

$\ln k = - \frac{E_{a}}{R T} + constant$

The gradient of the graph is equal to

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8 of 26

For a given initial reactant pressure, the half-life for a first order gaseous reaction was found to be 30 minutes.

If the experiment were repeated at half the initial reactant pressure, the half-life would be

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9 of 26

Which statement about the rate determining step of a reaction is correct?

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10 of 26

Nitrogen dioxide reacts with carbon monoxide as in the equation below.

NO₂ + CO ➔ NO + CO₂

The mechanism is:

NO₂ + NO₂ ➔ NO + NO₃ Slow

NO₃ + CO ➔ NO₂ + CO₂ Fast

Which expression is the correct rate equation?

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11 of 26

A student plots ln k (y-axis) against 1/T (in K^-1) for a reaction. The student gets a straight line graph that corresponds to the Arrhenius equation:

$\ln k = - \frac{E_{a}}{R T} + \ln A$

Which statement is correct?

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12 of 26

A graph is plotted of ln k against 1/T.

(k = rate constant, T = temperature in K)

The gradient has the numerical value of -55,000.

What is the activation energy, in kJ mol^-1?

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13 of 26

The equation for the reaction of ICl and H₂ is shown below.

2ICl_(g) + H₂(g) ➔ 2HCl_(g) + I_2(g)

The rate constant k for this reaction is 1.63 × 10^-6 dm³ mol^-1 s^-1.

What is the overall order of the reaction?

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14 of 26

Solutions of two compounds, W and X, react together in the presence of a soluble catalyst, Y, as shown in the equation

2W + X ➔ Z

When the concentrations of W, X and Y are all doubled, the rate of reaction increases by a factor of four.

Which is a possible rate equation for this reaction?

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15 of 26

The rate equation for the hydrogenation of ethene:

C₂H_4(g) + H_2(g) ➔ C₂H_6(g)

is rate = k[C₂H₄][H₂].

At a fixed temperature, the reaction mixture is compressed to triple the original pressure.

What is the factor by which the rate of reaction changes?

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16 of 26

The rate expression for the reaction between X and Y is

rate = k [X]²[Y]

Which statement is correct?

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17 of 26

What are the units of the rate constant for a third order reaction?

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18 of 26

The results of an investigation of the reaction between P and Q are shown in this table.

Table showing initial concentrations of P and Q and initial rate for two experiments investigating the reaction between P and Q.

The rate equation is: rate = k[P][Q]²

What is the initial concentration of Q in experiment 2?

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19 of 26

The rate expression for the reaction X_(g) + 2Y_(g) ➔ 3Z_(g) is

rate = k[X]⁰[Y]²

By which factor will the rate of reaction increase when the concentrations of X and Y are both increased by a factor of 3?

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20 of 26

Which is correct about reaction mechanisms?

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21 of 26

Which is true of an Arrhenius plot of lnk (y-axis) against $\frac{1}{T}$ ?

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22 of 26

What is the effect of increasing temperature on the rate contant, K?

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23 of 26

The reaction between NO₂ and F₂ gives the following rate data at a certain temperature.

[NO_2_] (mol dm^-3^)	[F_2_] (mol dm^-3^)	Rate (mol dm^-3^ min^-1^)
0.15	0.20	0.10
0.30	0.20	0.40
0.15	0.40	0.20

What is the overall order of reaction ?

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24 of 26

2NO_(g) + O_2(g) ➔ 2NO_2(g)

The rate equation for the reaction above is rate = k[NO]²[O₂]

Which statement is not correct?

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25 of 26

The inorganic anti-cancer drug cis-platin, Pt(NH₃)₂Cl₂, is hydrolysed by water to make it active. The reaction is

Pt(NH₃)₂Cl₂ + H₂O ➔ [Pt(NH₃)₂(H₂O)Cl]⁺ + Cl^-

The hydrolysis is first order overall. The half-life can be found from a graph of the concentration of cis-platin against time.

The half-life of the reaction is...

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26 of 26

Bromine oxidises methanoic acid to carbon dioxide.

The equation for the reaction is

HCOOH_(aq) + Br_2(aq) ➔ 2H⁺_(aq) + 2Br^-_(aq) + CO_2(g)

Which of the following methods would not be suitable for measuring the progress of this reaction?

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Kinetics - exam practice

Kinetics

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Kinetics - exam practice

Kinetics

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