Concept Test 3

Internet Concept Test Chemistry 22
Prof. J. C. Baird
Marn-Yee Lee, Silvia Georges, Derek Cummings
Topic: The Role of a Catalyst in Chemical Reactions

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Up to 4 people can work together on this test.

There are 3 questions.

Background material. It is not necessary to read this.

The Problem:
It is important to understand the factors that affect the speed of chemical reactions. It is also important to understand the chemistry of oxygen and its simple derivatives because of its importance in both chemistry and in biological systems. Below are three decomposition reactions of hydrogen peroxide,

, along with their rate constants. The equation describing the kinetics is:

Question 1

The fastest reaction is:

Reason for Answer:

Question 2

Of the three reactions 1), 2) and 3), as written, iron is a catalyst in:

choose all that apply.

none of the reactions

Reason for Answer:

Question 3

Reaction (2) involves free iron in solution and reaction (3) iron bound to catalase.

Please select an answer to the following question.

The reason the rate constant for the free iron ion (2) is and the catalase reaction (3) is is because:

Reason for Answer:

Question 4

The figures below show, schematically, the activation energy "hill" and the "reaction" coordinate for the reduction of hydrogen peroxide by ferrous iron.

(a)

(b)

Please select an answer to the following question.

The for (a) and for (b) is:

(a)

(b)

(a)

(b)

(a)

(b)

Reason for Answer:

Question 5

The activation energy, Ea, is greater in (a) than in (b), Ea > Eb. The reaction picture representing catalase is:

(a)

(b)

none of the above

Reason for Answer:

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