Final Exam Review

Exam 3

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

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 

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 

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

500

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

Cr

Exam 2 (20, 15, 16)

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

200

Complete the following equation: 

⁸⁴₃₆Al + ⁴₂He = ⁰_-1e + ? 

⁸⁸₃₉Y

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

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

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

Exam 1 (12-14

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

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

Rate Law Question (Go to worksheet) 

75: A

76: B

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

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