AP 5.9 Steady State Approximation BANK

• Rate=k[Br2][NO]

• Rate=k[Br2][NO]2

• Rate=k[Br2]2[NO]

• Rate=k[NOBr2][NO]

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NGSS.HS-PS1-5

2 NO(g) + O₂(g)  → 2 NO₂(g)

Consider the following mechanism for the reaction represented above.

Step 1: 2 NO   ⇄  N₂O₂              (fast reversible)

Step 2: N₂O₂ + O₂   →   2 NO₂         (slow)

Which of the following statements is true?

• Step 1 represents a unimolecular reaction.

• Increasing the concentration of NO will decrease the overall rate of the reaction.

• Raising the temperature will have no effect on the numerical value of the rate constant.

• The rate law that is consistent with the mechanism is rate = k[NO]²[O₂].

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NGSS.HS-PS1-5

NGSS.HS-PS1-7

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NGSS.HS-PS1-5

Step 1. N₂H₂O₂ ⇄ N₂HO₂^– + H⁺       (fast equilibrium)

Step 2. N₂HO₂^– → N₂O + OH^–        (slow)

Step 3. H⁺ + OH^– → H₂O                (fast)

Nitramide, N₂H₂O₂, decomposes slowly in aqueous solution. This decomposition is believed to occur according to the reaction mechanism above. The rate law for the decomposition of nitramide that is consistent with this mechanism is given by which of the following?

• Rate = k[N₂H₂O₂]

• Rate = k[N₂H₂O₂] [H⁺]

• Rate = k[N₂H₂O₂] [OH^-]

Tags

NGSS.HS-PS1-5

2H2(g)+2NO(g)→N2(g)+2H2O(g)

For the chemical reaction represented above, the following mechanism is proposed.

Step 1:2NO(g)⇌N2O2(g) (fast equilibrium)

Step 2:N2O2(g)+H2(g)→N2O(g)+H2O(g) (slow)

Step 3:N2O(g)+H2(g)→N2(g)+H2O(g) (fast)

Which of the following initial rate law expressions is consistent with this proposed mechanism?

• Rate=k[H2]2[NO]2

• Rate=k[NO]2

• Rate=k[H2][NO]2

• Rate=k[H2][N2O]2

Tags

NGSS.HS-PS1-5

Consider the following mechanism:

A₂ + B₂ ↔ R + C (fast)

A₂ + R → C (slow)

What is the overall simplified balanced equation?

• A₂ + B₂ → R + C

• A₂ + R → C

• 2A₂ + B₂ → 2C

• 2A₂ + B₂ → C

• 2A₂ + 2B₂ → 2C

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NGSS.HS-PS1-2

NGSS.HS-PS1-7

Consider the following mechanism:

A₂ + B₂ ↔ R + C (fast)

A₂ + R → C (slow)

What is the rate law?

• =k[A]²[B]²

• =k[A₂][B₂]

• =k[A₂]²[B₂][C]

Tags

NGSS.HS-PS1-5

What is the rate law expression for the following mechanism?

Step 1 AB + C₂ ,<-> AC₂ + B fast

Step 2 B + AB →  AB₂ slow

Step 3 AC₂ + AB₂ →  A₂C₂ + B₂ fast

Step 4A₂Cv + B₂  → A2C + B₂C fast

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NGSS.HS-PS1-5

Given below is the reaction mechanism for a certain chemical reaction. Which is the correct rate law from the molecularity of the step(s) indicated?

1. NO + O₃ ↔ NO₂ + O₂ slow

2. O₃ --> O₂ + O fast

3. NO₂ + O --> NO + O₂ fast

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NGSS.HS-PS1-5

What is the rate law for this mechanism?

• rate = k[A][B]²

• rate = [B][X]

• rate = [A]^0.5[B]^1.5

• rate = [W][Y][Z]

Tags

NGSS.HS-PS1-5