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

Kinetics

Total marks:0 / 15

1 of 15

These questions concern the Maxwell-Boltzmann energy distribution shown below.

Graph showing the Maxwell-Boltzmann energy distribution with activation energy Ea marked.

What is the best way to describe the activation energy, E_a, of a reaction?

0 / 1

2 of 15

How does the addition of a catalyst to a reaction affect the shape of the Maxwell-Boltzmann distribution curve?

0 / 1

3 of 15

The reaction pathway diagram below illustrates the energies of the reactants, the products and the transition state of a reaction.

Diagram illustrating the reaction pathway with energies of reactants, products, and transition state.

Which expression represents the activation energy of the forward reaction?

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4 of 15

In the diagram, curve X was obtained by observing the decomposition of 100 cm³ of 1.0 mol dm^-3 hydrogen peroxide, catalysed by manganese(IV) oxide.

Graph showing volume of oxygen formed over time with curves X and Y.

Which alteration to the original experimental conditions would produce curve Y?

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5 of 15

The diagram shows the Boltzmann distribution of energies in a gas. The gas can take part in a reaction with an activation energy, E_a. The gas is maintained at a constant temperature.

Diagram showing the Boltzmann distribution of molecular energies in a gas with activation energy Ea.

Which statement is correct?

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6 of 15

Iodine and propanone react according to the following equation.

I_2(aq) + CH₃COCH_3(aq) ➔ CH₃COCH₂I_(aq) + HI_(aq)

If the concentration of propanone is increased, keeping the total reaction volume constant, the rate of the reaction also increases.

What could be the reason for this?

0 / 1

7 of 15

A Maxwell-Boltzmann curve shows the distribution of molecular energies in a reaction system.

When the temperature in this system is increased, the peak is

0 / 1

8 of 15

What is the main reason for the increase in reaction rate with increasing temperature?

0 / 1

9 of 15

The figure shows a typical energy distribution for particles of an ideal gas in a sealed container at a fixed temperature.

Graph showing the energy distribution for particles of an ideal gas in a sealed container at a fixed temperature.

Which of the following statements is true?

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10 of 15

The Maxwell-Boltzmann distribution of molecular energies in a sample of gas at a fixed temperature is shown.

Which letter represents the mean energy of the molecules?

Graph showing the Maxwell-Boltzmann distribution of molecular energies in a gas sample at fixed temperature with points A, B, C, and D indicated.

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11 of 15

What decreases the activation energy of a reaction?

0 / 1

12 of 15

Samples of sodium carbonate powder were reacted with separate samples of excess hydrochloric acid.

Na₂CO_3(s) + 2HCl_(aq) ➔ CO_2(g) + 2NaCl_(aq) + H₂O_(l)

Reaction A: 1.0 g Na₂CO_3(s) added to 0.50 mol dm^-3 HCl_(aq)

Reaction B: 1.0 g Na₂CO_3(s) added to 2.0 mol dm^-3 HCl_(aq)

What is the same for reactions A and B?

0 / 1

13 of 15

The potential energy profile for the reversible reaction, X + Y ⇌ Z is shown.

Which arrow represents the activation energy for the reverse reaction, Z ➔ X + Y, with a catalyst?

0 / 1

14 of 15

CaCO_3(s) + 2HCl_(aq) ➔ CaCl_2(aq) + H₂O_(l) + CO_2(g)

Which change does not increase the initial rate of reaction when CaCO_3(s) is added to excess HCl_(aq)?

0 / 1

15 of 15

Curve 1 shows the mass change when marble chips are added to excess hydrochloric acid in an open beaker.

Which changes would produce curve 2?

0 / 1

Kinetics

Total marks:0 / 15

1 of 15

These questions concern the Maxwell-Boltzmann energy distribution shown below.

What is the best way to describe the activation energy, E_a, of a reaction?

0 / 1

2 of 15

How does the addition of a catalyst to a reaction affect the shape of the Maxwell-Boltzmann distribution curve?

0 / 1

3 of 15

The reaction pathway diagram below illustrates the energies of the reactants, the products and the transition state of a reaction.

Which expression represents the activation energy of the forward reaction?

0 / 1

4 of 15

In the diagram, curve X was obtained by observing the decomposition of 100 cm³ of 1.0 mol dm^-3 hydrogen peroxide, catalysed by manganese(IV) oxide.

Which alteration to the original experimental conditions would produce curve Y?

0 / 1

5 of 15

The diagram shows the Boltzmann distribution of energies in a gas. The gas can take part in a reaction with an activation energy, E_a. The gas is maintained at a constant temperature.

Which statement is correct?

0 / 1

6 of 15

Iodine and propanone react according to the following equation.

I_2(aq) + CH₃COCH_3(aq) ➔ CH₃COCH₂I_(aq) + HI_(aq)

If the concentration of propanone is increased, keeping the total reaction volume constant, the rate of the reaction also increases.

What could be the reason for this?

0 / 1

7 of 15

A Maxwell-Boltzmann curve shows the distribution of molecular energies in a reaction system.

When the temperature in this system is increased, the peak is

0 / 1

8 of 15

What is the main reason for the increase in reaction rate with increasing temperature?

0 / 1

9 of 15

The figure shows a typical energy distribution for particles of an ideal gas in a sealed container at a fixed temperature.

Which of the following statements is true?

0 / 1

10 of 15

The Maxwell-Boltzmann distribution of molecular energies in a sample of gas at a fixed temperature is shown.

Which letter represents the mean energy of the molecules?

0 / 1

11 of 15

What decreases the activation energy of a reaction?

0 / 1

12 of 15

Samples of sodium carbonate powder were reacted with separate samples of excess hydrochloric acid.

Na₂CO_3(s) + 2HCl_(aq) ➔ CO_2(g) + 2NaCl_(aq) + H₂O_(l)

Reaction A: 1.0 g Na₂CO_3(s) added to 0.50 mol dm^-3 HCl_(aq)

Reaction B: 1.0 g Na₂CO_3(s) added to 2.0 mol dm^-3 HCl_(aq)

What is the same for reactions A and B?

0 / 1

13 of 15

The potential energy profile for the reversible reaction, X + Y ⇌ Z is shown.

Which arrow represents the activation energy for the reverse reaction, Z ➔ X + Y, with a catalyst?

0 / 1

14 of 15

CaCO_3(s) + 2HCl_(aq) ➔ CaCl_2(aq) + H₂O_(l) + CO_2(g)

Which change does not increase the initial rate of reaction when CaCO_3(s) is added to excess HCl_(aq)?

0 / 1

15 of 15

Curve 1 shows the mass change when marble chips are added to excess hydrochloric acid in an open beaker.

Which changes would produce curve 2?

0 / 1

Kinetics - exam practice

Kinetics

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Kinetics - exam practice

Kinetics

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