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1. What is the strongest type of intermolecular force expected in a sample of:

a. HOOH (hydrogen peroxide) hydrogen bonding b. CO 2 dispersion forces c. H 2 CO dipole-dipole d. KCl ionic e. CH 3 F dipole-dipole

2. Which substance has the highest boiling point in each group?

a. CH 4 , CH 3 CH 2 OH , CH 3 CH 3 b. H 2 Se, H 2 O , H 2 S c. NH 3 , AsH 3 , PH 3 d. CH 4 , SiH 4 , GeH (^4)

3. Consider the phase diagram at right. For the substance that it describes, answer the following questions.

a. What change occurs when you move from position A to B? substance melts b. How do you bring about the change from position C to B? increase P at constant T c. How many phases are present at positions A, C, and D, respectively? 1, 2, and 3 d. If the temperature is increased from position C (with the pressure held constant) what will happen to the material? C is at liquid-vapor equilibrium. By increasing T, all the liquid will be vaporized.

4. Chromium metal has is known to pack in a body-centered cubic unit cell with a lattice constant of 2.88×10 -10^ m. Determine the atomic radius of a chromium atom.

For the body centered cubic unit cell:

( ) ( )

( )

R 1.25 10 m

R a 2.88 10 m

4R a 2 a 3a

10

10 4

3 4

3

(^2222)

−

−

= ×

= = ×

= + =

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5. Write a rate equation for this reaction in terms of the changes in the concentrations of the species present.

2 A + 3 B + C → D + 2 E

[ ] [ ] [ ] [ ] [ ] 2 t

ΔE

Δt

Δ D

Δt

Δ C

3 t

ΔB

2 t

ΔA

Rate Δ

=− = =

Δ

=−

Δ

=−

6. The generic reaction A → B + C is known to first-order. How long will it take for 90% of a 0.648- M solution of A to be used if the half-life of the reaction is 48.3 s?

[ ] [ ] ( ) ( ) ( ) 160 s

0. 0648 0. 648 0. 0144

1. 0144 s

2

21

21

=

= −

= −

= ⇒ = = −

t

ln ln t

lnA lnA kt

t

ln k k

ln t

o

7. The generic reaction AB → A + B was monitored as a function of time. A plot of 1/[AB] vs. time was found to be linear and the best-fit line through the data had a slope of 0.055 L·mol -1^ ·s -1^. What is the half-life of this reaction if the initial concentration of AB is 0.55 M?

[ ] [ ]

33. 1 s

( 0. 055 ) ( 0. 55 )

1 ( 0. 55 )

1

1 1

1. 055

21

21 21

= +

= +

= (^) ⋅

t

t

kt A A

k

o

molLs

8. A certain zero-order decomposition reaction has a rate constant k = 0. ௠௢௟ ௅·௦. If you begin with a 2.49- M sample of the reactant, what is the half-life for the reaction?

( )

335 s

- 1.245 0.00372()

2.49 0.00372() 2.

[X] [X]

2

1

2 o o

1

=

= −

=− +

=− +

t

t

t

kt 21

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