Reaction Mechanisms

 1) The reaction of nitrogen dioxide and carbon monoxide

NO₂(g) + CO(g) NO(g) + CO₂(g)

has the following rate expression at high temperatures

Rate = k[NO₂][CO]

Is the following mechanism compatible with the experimental information?

NO₂ + CO O-N-O-C-O (slow)

O-N-O-C-O NO + CO₂ (fast)

     (a) The mechanism is compatible because the mechanism sums to the overall reaction.

     (b) The mechanism is compatible because the mechanism sums to the overall reaction and the mechanism predicts a rate law that agrees with the experimentally observed rate law.

     (c) The mechanism is compatible because the mechanism predicts a rate law that agrees with the experimentally observed rate law.

     (d) The mechanism is not compatible because the mechanism does not sum to the overall reaction.

     (e) The mechanism is not compatible because the mechanism does not predict a rate law that agrees with the experimentally observed rate law.

 2) The reaction of nitrogen dioxide and carbon monoxide

NO₂(g) + CO(g) NO(g) + CO₂(g)

has the following rate expression at high temperatures

Rate = k[NO₂][CO]

Is the following mechanism compatible with the experimental information?

NO₂ + NO₂ NO₃ + NO (slow)

NO₃ + CO NO₂ + CO₂ (fast)

     (a) The mechanism is compatible because the mechanism sums to the overall reaction.

     (b) The mechanism is compatible because the mechanism sums to the overall reaction and the mechanism predicts a rate law that agrees with the experimentally observed rate law.

     (c) The mechanism is compatible because the mechanism predicts a rate law that agrees with the experimentally observed rate law.

     (d) The mechanism is not compatible because the mechanism does not sum to the overall reaction.

     (e) The mechanism is not compatible because the mechanism does not predict a rate law that agrees with the experimentally observed rate law.

 3) The reaction of nitrogen dioxide and carbon monoxide

NO₂(g) + CO(g) NO(g) + CO₂(g)

has the following rate expression at high temperatures

Rate = k[NO₂][CO]

Is the following mechanism compatible with the experimental information?

NO₂ + CO NO₃ + C (slow)

C + O₂ CO₂ (fast)

     (a) The mechanism is compatible because the mechanism sums to the overall reaction.

     (b) The mechanism is compatible because the mechanism sums to the overall reaction and the mechanism predicts a rate law that agrees with the experimentally observed rate law.

     (c) The mechanism is compatible because the mechanism predicts a rate law that agrees with the experimentally observed rate law.

     (d) The mechanism is not compatible because the mechanism does not sum to the overall reaction.

     (e) The mechanism is not compatible because the mechanism does not predict a rate law that agrees with the experimentally observed rate law.

  4) The reaction of nitrogen dioxide and carbon monoxide

NO₂(g) + CO(g) NO(g) + CO₂(g)

has the following rate expression at high temperatures

Rate = k[NO₂][CO]

Is the following mechanism compatible with the experimental information?

NO₂ + NO₂ N₂O₄ (slow)

N₂O₄ + CO NO + CO₂ + NO₂ (fast)

     (a) The mechanism is compatible because the mechanism sums to the overall reaction.

     (b) The mechanism is compatible because the mechanism sums to the overall reaction and the mechanism predicts a rate law that agrees with the experimentally observed rate law.

     (c) The mechanism is compatible because the mechanism predicts a rate law that agrees with the experimentally observed rate law.

     (d) The mechanism is not compatible because the mechanism does not sum to the overall reaction.

     (e) The mechanism is not compatible because the mechanism does not predict a rate law that agrees with the experimentally observed rate law.

 5) The reaction of nitrogen dioxide and carbon monoxide

NO₂(g) + CO(g) NO(g) + CO₂(g)

has the following rate expression at low temperatures

Rate = k[NO₂]²

Is the following mechanism compatible with the experimental information?

NO₂ + CO O-N-O-C-O (slow)

O-N-O-C-O NO + CO₂ (fast)

     (a) The mechanism is compatible because the mechanism sums to the overall reaction.

     (b) The mechanism is compatible because the mechanism sums to the overall reaction and the mechanism predicts a rate law that agrees with the experimentally observed rate law.

     (c) The mechanism is compatible because the mechanism predicts a rate law that agrees with the experimentally observed rate law.

     (d) The mechanism is not compatible because the mechanism does not sum to the overall reaction.

     (e) The mechanism is not compatible because the mechanism does not predict a rate law that agrees with the experimentally observed rate law.

 6) The decomposition of dinitrogen pentoxide

2N₂O₅(g) 4NO₂(g) + O₂(g)

has the following rate expression

Rate = k[N₂O₅]

Is the following mechanism compatible with the experimental information?

N₂O₅ NO₂ + NO₃ (slow)

NO₃ NO + O₂ (fast)

NO + N₂O₅ 3NO₂ (fast)

     (a) The mechanism is compatible because the mechanism sums to the overall reaction.

     (b) The mechanism is compatible because the mechanism sums to the overall reaction and the mechanism predicts a rate law that agrees with the experimentally observed rate law.

     (c) The mechanism is compatible because the mechanism predicts a rate law that agrees with the experimentally observed rate law.

     (d) The mechanism is not compatible because the mechanism does not sum to the overall reaction.

     (e) The mechanism is not compatible because the mechanism does not predict a rate law that agrees with the experimentally observed rate law.

 7) Experiments have shown the decomposition of

2NO₂Cl(g) 2NO₂(g) + Cl₂(g)

has the following rate expression

Rate = k[NO₂Cl]

Is the following mechanism compatible with the experimental information?

NO₂Cl NO + OCl (slow)

2NO + O₂ 2NO₂ (fast)

2OCl + 2CO 2CO₂ + Cl₂ (fast)

     (a) The mechanism is compatible because the mechanism sums to the overall reaction.

     (b) The mechanism is compatible because the mechanism sums to the overall reaction and the mechanism predicts a rate law that agrees with the experimentally observed rate law.

     (c) The mechanism is compatible because the mechanism predicts a rate law that agrees with the experimentally observed rate law.

     (d) The mechanism is not compatible because the mechanism does not sum to the overall reaction.

     (e) The mechanism is not compatible because the mechanism does not predict a rate law that agrees with the experimentally observed rate law.

 8) Experiments have shown the decomposition of

2NO₂Cl(g) 2NO₂(g) + Cl₂(g)

has the following rate expression

Rate = k[NO₂Cl]

Is the following mechanism compatible with the experimental information?

NO₂Cl + NO₂Cl N₂O₄ + Cl₂ (fast)

N₂O₄ 2NO₂ (slow)

     (a) The mechanism is compatible because the mechanism sums to the overall reaction.

     (b) The mechanism is compatible because the mechanism sums to the overall reaction and the mechanism predicts a rate law that agrees with the experimentally observed rate law.

     (c) The mechanism is compatible because the mechanism predicts a rate law that agrees with the experimentally observed rate law.

     (d) The mechanism is not compatible because the mechanism does not sum to the overall reaction.

     (e) The mechanism is not compatible because the mechanism does not predict a rate law that agrees with the experimentally observed rate law.

9) Experiments have shown the decomposition of

2NO₂Cl(g) 2NO₂(g) + Cl₂(g)

has the following rate expression

Rate = k[NO₂Cl]

Is the following mechanism compatible with the experimental information?

NO₂Cl + NO₂Cl N₂O₄ + Cl₂ (fast)

N₂O₄ 2NO₂ (slow)

     (a) The mechanism is compatible because the mechanism sums to the overall reaction.

     (b) The mechanism is compatible because the mechanism sums to the overall reaction and the mechanism predicts a rate law that agrees with the experimentally observed rate law.

     (c) The mechanism is compatible because the mechanism predicts a rate law that agrees with the experimentally observed rate law.

     (d) The mechanism is not compatible because the mechanism does not sum to the overall reaction.

     (e) The mechanism is not compatible because the mechanism does not predict a rate law that agrees with the experimentally observed rate law.

10) Experiments have shown the decomposition of

2NO₂Cl(g) 2NO₂(g) + Cl₂(g)

has the following rate expression

Rate = k[NO₂Cl]

Is the following mechanism compatible with the experimental information?

NO₂Cl NO₂ + Cl (slow)

NO₂Cl + Cl NO₂ + Cl₂ (fast)

     (a) The mechanism is compatible because the mechanism sums to the overall reaction.

     (b) The mechanism is compatible because the mechanism sums to the overall reaction and the mechanism predicts a rate law that agrees with the experimentally observed rate law.

     (c) The mechanism is compatible because the mechanism predicts a rate law that agrees with the experimentally observed rate law.

     (d) The mechanism is not compatible because the mechanism does not sum to the overall reaction.

     (e) The mechanism is not compatible because the mechanism does not predict a rate law that agrees with the experimentally observed rate law.