Exam 3
Exam 2 (20, 15, 16)
Exam 1 (12-14
100


Milli Mole prepared 4 solutions by dissolving 0.5 g of benzoic acid in 1 L of each of the following. Which
one had the highest percent ionization of benzoic acid?
a. pure water c. 0.05 M sodium benzoate
b. 0.01 M sodium benzoate d. 0.09 M sodium benzoate




pure water

100

List out all strong acids and strong bases

SA: HCl, HBr, HI, HNO3, HClO4, HClO3, H2SO4

SB: LiOH, NaOH, KOH, RbOH, CsOH, CaOH2, SrOH2, BaOH2

100

In which of the following molecules is hydrogen bonding likely to be the most significant component of the total intermolecular forces?

A)CH4

B)C5H11OH

C)CO2

D)CH3OH

E)C6H13NH2

CH3OH

200

What is the pH after 0.05 moles of NaOH are added to 1 L of a buffer which is 0.22 M CH3COOH and 0.45 M
Na CH3COO? Assume no volume change. Pka= 4.74
a. 4.91     c. 4.74
b. 5.06     d. 5.2

5.2 

200

Complete the following equation: 

8436Al + 42He = 0-1e + ? 

8839Y

200

A solution is prepared by dissolving 27.7g of CaCl2 in 375 g of water. The concentration of CaCl2 is ________% by mass.

A)6.88

B)0.0722

C)7.22

D)0.0688

E)6.24

6.88

300

For the reaction
C2H6(g) -> C2H4 (g) + H2(g)
Delta H is +137 kJ/mol and DeltaS is +120 J/mol K. This reaction is ______.
a. spontaneous at all temperatures.
b. spontaneous only at high temperatures.

c. spontaneous only at low temperatures. 

d. nonspontaneous at all temperatures.

Spontaneous at high temp 

300

Find the pH of a 0.0010 M solution of Sr(OH)2.
a. 3.0

b. 11.30
c. 2.70 

d. 11.00

11.30

300

Rate Law Question (Go to worksheet) 

75: A

76: B

400

For a reaction, K= 1.8 x 10-5 at 298 K. Calculate delta G° for the reaction.
a. 27 kJ      d. 1.2 x 10-5 kJ
b. 0.045 kJ  e. 5.1 x 105 kJ
c. 3.4 kJ


27 kJ

400

Consider the following chemical reaction:

CO (g)+2H2(g) = CH3OH (g)

At equilibrium, the concentrations of CO and H2 were 0.15 M and 0.36 M, respectively. What is the equilibrium concentration of CH3OH? The value of Keq for this reaction is 14.5 

A)7.61×10-3

B)14.5

C)2.82×10-1

 

2.82 x 10-1

400

The enthalpy change for converting 10.0 g of ice at -50.0°C to water at 50.0°C is BLANK kJ. The specific heats of ice, water, and steam are 2.09 J/g-K, 4.18 J/g-K, and 1.84 J/g-K, respectively.For H2O,̇ Hfus=6.01 kJ/mol, anḋ  Hvap=40.67 kJ/mol.20)

A)3138

B)12.28

C)6.47

D)9.15

E)4.38

6.47

500

Fe+2 + H+ + Cr2O7-2 -> Fe+3 + Cr+3+ H2O
Which element is reduced?
a. Fe   c. O
b. Cr   d. H

Cr

500

What is the pH of a 0.068 M solution of NaCN? The Ka for HCN is 4.9 x 10-10.
a. 7.00 

b. 0.74
c. 11.07 

d. 13.24

11.07

500

81: The reaction 2NO2-> 2NO+O2 follows second-order kinetics. At 300°C, [NO2] drops from 0.0100 M to 0.00650 M in 100.0 s. The rate constant for the reaction is ________ M-1s-. 2nd order: 1/[A]t = kt + 1/[A]0

A)0.65

B)0.81

C)1.2

D)0.54

E)0.09612




0.54

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