Question

Relative Rates of Reactants and ProductsRecall that Reaction rate is a measure of how fast reactants

convert to products. By convention, the reaction rate is equal to the rate of appearance or disappearance of a reaction species which has a coefficient of 1 in the balanced equation.

For the generic reaction:

aA + bB → cC + dD

The Rate Expression is written as:

Reaction rate = −1aΔ[A]Δt=−1bΔ[B]Δt=1cΔ[C]Δt=1dΔ[D]Δt

Part A – With a correct rate expression the reaction rate may be expressed in terms of any reactant or product. Keep in mind that a pure substance, such as a liquid or solid, does not change concentration as it reacts and is not included on the rate expression.

For the reaction below, which of the following terms are equivalent to the reaction rate?
A(aq)+5B(l)+6C(aq)→3D(aq)+3E(l)

Select all of the terms below equivalent to the rate of this reaction.

Select all of the terms below equivalent to the rate of this reaction.

−Δ[A]Δt

Δ[A]Δt

−15Δ[B]Δt

−5Δ[B]Δt

15Δ[B]Δt

5Δ[B]Δt

−16Δ[C]Δt

−6Δ[C]Δt

16Δ[C]Δt

6Δ[C]Δt

−13Δ[D]Δt

−3Δ[D]Δt

13Δ[D]Δt

3Δ[D]Δt

−13Δ[E]Δt

−3Δ[E]Δt

13Δ[E]Δt

3Δ[E]Δt

Part B – Based upon the slopes in Figure 1. Which slope represents the substance with the greatest rate of appearance or disappearance?

Please Choose-0.0170 M/s  0.0511 M/s -0.1026 M/s

Part C – Based upon the slopes in Figure 1. Which slope represents the rate of appearance of a product?

Please Choose 0.0511 M/s -0.1026 M/s -0.0170 M/s

Part D – Which of the following best explains this reasoning for your last anwer?

Select all that apply.

the slope is negative

the concentration of products increases as a reaction proceeds

the concentration of products decrease as a reaction proceeds

the slope is positive

For the following questions, use the balanced chemical equation and the rate expression to help determine which reaction species relates to each slope (initial rate) measured in Figure 1.

A(aq)+5B(l)+6C(aq)→3D(aq)+3E(l)

reaction rate =−Δ[A]Δt=−16Δ[C]Δt=13Δ[D]Δt

Part E – Which of the folowing is a valid representation of the rate of disappearance of A?

rate of disappearance of A =

Δ[A]Δt

−Δ[A]Δt

Part F – Which of the folowing is a valid representation of the rate of disappearance of C?

Rate of disappearance of C =

−Δ[C]Δt

−16Δ[C]Δt

Δ[C]Δt

16Δ[C]Δt

Part G

According to the balanced chemical equation, the rate of disappearance of A (−Δ[A]Δt) is Please Choose3 times 6 times 1/3 1/6 None of the above  the rate of disappearance of C (−Δ[C]Δt).

Part H – Considering the relative slopes in Figure 1, what is the value of the rate of disappearance of A?

−Δ[A]Δt =	M/s

Part I

The rate of disappearance of C (−Δ[C]Δt) is Please Choose1/6 6 2 1/2 None of the above   the rate of appearance of D (Δ[D]Δt).

As you can see, if you know the rate of reaction of any species in a reaction, you can use the balanced equation and the rate expression to calculate the initial rate of appearance or disappearance of any other species, even the rate of the reaction itself.

Part J – As seen in Figure 1, the rate of disappearance of C is 0.1026 M/s. Use this value to calculate the rate of appearance of D. (It will be close, but not exactly the experimental value in Figure 1)

Calculate the rate of appearance of D:

Δ[D]Δt =	M/s

By convention, the reaction rate is equal to the rate of appearance or disappearance of a reaction species which has a coefficient of 1 in the balanced equation.

Part K – What is the rate of this reaction?

Reaction rate =

 

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