M5S4 – Mechanisms and Orders

Mechanisms from Orders

1 / 10

Consider the following reaction:

3NO_(g) => 2N₂O_(g) + NO_2(g)

The rate equation was found, by experiment:

rate = k [NO]²

Which of the following statements is/are true?

(i) There are two particles of the radical NO involved in the rate determining step

(ii) One particle of NO must be used up in a step that isn’t the rate determining step

(iii) Quadrupling [NO] raises the rate of nitrogen dioxide by, 2N₂O₂ production by 16 times

(iv) Tripling [NO] raises the rate of nitrous oxide, 2N₂O production by 8 times

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

2 / 10

Consider the following reaction:

2ICl_(g) + H₂_(g) => HCl _(g)+ I_2(g)

The rate equation was found, by experiment:

rate = k [ICl] [H₂]

Which of the following statements is/are true?

(i) There are two particles involved in the rate determining step

(ii) There are two IClparticles involved in the rate determining step

(iii) IClparticles must be involved in involved in more than one step

(iv) The rate of production of I_2(g) doubles when both [ICl] and [H] double

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

3 / 10

Consider the following reaction:

2N₂O_5(g) => 4NO₂_(g)+ O₂_(g)

The rate equation was found, by experiment:

rate = k [N₂O₅]

Which of the following statements is/are true?

(i) Doubling the concentration N₂O₅ caused the rate of production of 4NO₂ to increase by 4 times

(ii) Tripling the concentration N₂O₅ caused the rate of production of O₂ to increase by 3 times

(iii) There are two particles of N₂O₅ involved in the rate determining step

(iv) The mechanism is probably multi step

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

4 / 10

Consider the following reaction:

C₄H₉Cl_(aq) + OH^-_(aq) => C₄H₉OH_(aq) + Cl^-_(aq)

The rate equation was found, by experiment:

rate = k [C₄H₉Cl]

Which of the following statements is/are true?

(i) Increasing the concentrations of all reactants speeds up the nucleophilic substitution reaction

(ii) The mechanism probably has only one step

(iii) There are two particles involved in the rate determining step

(iv) OH^- is required for the overall reaction to proceed

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

5 / 10

Consider the following reaction.

O_3(g) + Cl_(g) => O_2(g)+ ClO_(g)

The rate equation was found, by experiment.

rate = k [O₃] [Cl]

Which of the following statements is/are true?

(i) Doubling [O₃] has no effect on the rate of the reaction

(ii) The mechanism probably has more than one step

(iii) There is one particle involved in the slowest step

(iv) The mechanism probably has only one step

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

6 / 10

Consider the following reaction:

2H₂O_2(g) => 2H₂O_(g)+ O₂_(g)

The rate equation was found, by experiment:

rate = k [H₂O₂]

Which of the following statements is/are true?

(i) The mechanism must be multi step

(ii) Doubling [H₂O_{] quadruples the rate of the reaction}

(iii) [H₂O] must be consumed in more than one step

(iv) The mechanism probably has only one step

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

7 / 10

Consider the following reaction:

2NO_(g) + O₂_(g) => 2NO₂_(g)

The rate equation was found, by experiment:

rate = k [NO_(g)]² [O_2(g)]

Which of the following statements is/are true?

(i) Doubling [O₂] has no effect on the rate of the reaction

(ii) Doubling both [NO] and [O₂] quadruples the rate of the reaction

(iii) Tripling [NO] triple the rate of the reaction

(iv) The mechanism may have only one step

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

8 / 10

Consider the following reaction:

2NO_(g) + 2H₂_(g) => N₂_(g) + 2H₂O_(g)

The rate equation was found, by experiment:

rate = k [NO]²[H₂]

Which of the following statements is/are true?

(i) The mechanism has more than one step

(ii) Doubling [NO₂] quadruples the rate of the reaction

(iii) H₂ is consumed in more than one of the steps

(iv)The mechanism has only one step

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

9 / 10

Consider the following reaction:

2NO₂_(g) + F₂_(g) => 2NO₂F_(g)

The rate equation was found, by experiment:

rate = k [NO₂] [F₂]

Which of the following statements is/are true?

(i) The mechanism has more than one step

(ii) Doubling [NO₂] doubles the rate of the reaction

(iii) NO₂ is produced in one of the steps

(iv) The mechanism has only one step

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

10 / 10

Consider the following reaction:

NO₂_(g)+ CO_(g) => NO_(g)+ CO₂_(g)

The rate equation was found, by experiment:

rate = k [NO₂]²

Which of the following statements is/are true?

(i) The mechanism has more than one step

(ii) CO is involved in the rate determining step

(iii) NO₂ is produced in one of the steps

(iv) The mechanism has only one step

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

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