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Exam 3 with Answer Key for General Chemistry II | CHEM 1120, Exams of Chemistry

Roane State Community College Chemistry

Material Type: Exam; Class: General Chemistry II; Subject: Chemistry; University: Roane State Community College; Term: Spring 2006;

Typology: Exams

Pre 2010

Uploaded on 08/18/2009

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CHEM 1120 test 3 - Spring 2006 Page 1

Circle the correct answer on the answer sheet.

R = 8.314 J mol-1 K-1 ln(2) = 0.693

†

H

eRT

kA

Δ

−

=

1. The rate constant for a reaction is 1.2 × 10-2 s-1 at room temperature (25EC). The activation

energy is 35.0 kJ mol-1. What is the reaction rate constant at 100EC?

a. 7.0 × 1054 b. 2.1 × 10-1 s-1 c. 7.0 × 10-4 d. 0.998 e. 1.002

2. The following data was determined in a kinetics experiment.

time /min pressure /atm time /min pressure /atm

0.00 2.500 4.00 0.338

2.00 0.920 6.00 0.125

What is the order of this reaction?

a. 0th b. ½ order c. 1st d. 2nd e. 3rd

3. The following initial rates were determined for one of the reactants in a reaction.

CM /Mrate /M s-1 CM /Mrate /M s-1

10 1.50 20 6.00

15 3.78 25 9.38

What is the order of the reaction in this reactant?

a. -1st b. 0th c. 1st d. 2nd e. 3rd

4. The half life of a nuclear decay is 15.5 yr. After how many years will there be just 15 % left?

a. 42.4 yr b. 13.0 yr c. 31.0 yr d. 95.0 yr e. 67.0 yr

Partial preview of the text

Download Exam 3 with Answer Key for General Chemistry II | CHEM 1120 and more Exams Chemistry in PDF only on Docsity!

Circle the correct answer on the answer sheet.

R = 8.314 J mol -1^ K-1^ ln(2) = 0.

H^ †

k A e RT

−^ Δ

The rate constant for a reaction is 1.2 × 10 -2^ s -1^ at room temperature (25EC). The activation energy is 35.0 kJ mol -1^. What is the reaction rate constant at 100EC? a. 7.0 × 10^54 b. 2.1 × 10-1^ s -1^ c. 7.0 × 10 -4^ d. 0.998 e. 1.
The following data was determined in a kinetics experiment.

time /min pressure /atm time /min pressure /atm 0.00 2.500 4.00 0. 2.00 0.920 6.00 0.

What is the order of this reaction? a. 0 th^ b. ½ order c. 1 st^ d. 2 nd^ e. 3 rd

The following initial rates were determined for one of the reactants in a reaction. CM / M rate / M s -1^ CM / M rate / M s - 10 1.50 20 6. 15 3.78 25 9. What is the order of the reaction in this reactant? a. -1st^ b. 0 th^ c. 1 st^ d. 2 nd^ e. 3 rd
The half life of a nuclear decay is 15.5 yr. After how many years will there be just 15 % left? a. 42.4 yr b. 13.0 yr c. 31.0 yr d. 95.0 yr e. 67.0 yr

The following is the reaction mechanism for the reaction H 2 + I 2! 2HI. I 2 º 2I.^ fast H 2 + I.^! H 2 I.^ slow H 2 I.^ + I 2! 2HI fast The observed kinetics is given as:

a. rate = k P ' H 2 PI 2

b. 2 2 2 2

' H I^1 (i.e. k'^ H )

I

rate k P P P

P

=^ −

c. rate = k P ' H 2 PI^3

d. rate = k P ' H^2 2 PI 2

e. rate = k P ' H 2 PI^122

The slope of the plot of ln( k ) versus 1/T (an Arrhenius plot) is –2.55 × 10 3 K. What is the value for the activation energy? a. 10 kJ mol -1^ b. 21.2 kJ mol -^ c. 25 kJ mol -11^ d. 46 kJ mol -1^ e. 50 kJ mol -
The following data are the amounts of reactants with respect to time for a first order reaction. What is the rate constant? time /min reactant /g time /min reactant /g 0 16.520 30.0 0. 10.0 6.389 40.0 0. 20.0 2.471 50.0 0. a. 0.095 s -1^ b. 0.22 s -1^ c. 20.0 s -1^ d. 2.0 × 10-2^ s -1^ e. 1.0 × 10 -3^ s -
The organic chemist rule of thumb depends upon most organic reaction having an activation energy of about 50 kJ mol -1^. If this worked, about how much faster would a reaction go if one were to increase the temperature by 10EC starting at room temperature (25EC)? a. half as fast b. 50 % faster (1.5 times faster) c. 2 times faster d. 3 times faster e. 4 times faster

What is the product for the following reaction? CH 3 CH 2 OH + C 6 H 5 COOH presence of sulfuric acid^ >? a. an ether b. an amide c. an ester d. a Nylon® e. a Teflon®
What is the product for the following reaction? CH 2 =CH 2 + Br 2!?

a. b. c. d. e.

Which of the following structures is not a correct organic structure? a. b.

c. d. e.

What is the product in the following reaction? H 2 C=CH 2 UV light or catalysts^ >?

a. b.

c. Teflon ® d. e. Nylon ®

What is the monomer for latex (and rubber) a. b.