Free Printable Final Exam Review

1.

Which one of the following is a first order, overall reaction

a)

k₁= 1.000 M s^-1

b)

k₁= 5403.2 M^½ s^½

c)

k₁= 1.23 x 10^-6 M^-1 s^-1

d)

k₁= 10.7 s^-1

2.

Which of the following statements is correct for the graphs given here?

a)

A. is most exothermic

b)

B. is most exothermic

c)

C. is most exothermic

d)

D. is most exothermic

3.

step 1: O₃ → O₂ + O
step 2: O₃ + O → 2 O₂
The oxygen atom (O) is considered to be a(n)...

a)

reactant

b)

catalyst

c)

reaction intermediate

d)

activated complex

4.

Multi-step (Consecutive) Reactions:
Mechanisms in which one elementary step is followed by another are very common.
step 1: A + B → Q
step 2: B + Q → C
net reaction: A + 2B → C
Which of the following is false?

a)

The net reaction is just the sum of its elementary steps.

b)

The species Q is an intermediate, usually an unstable or highly reactive species.

c)

Intermediates such as Q can appear in the rate law of a net reaction.

d)

If both steps proceed at similar rates, rate law experiments on the net reaction would not reveal that two separate steps are involved here.The rate law for the reaction would berate=k[A][B]2

5.

The rate law for a reaction is rate = k [A][B]² .

Which one of the following statements is false?

a)

A) If [B] is doubled, the reaction rate will increase by a factor of 4.

b)

B) The reaction is second order in B.

c)

C) The reaction is first order in A.

d)

D) The reaction is second order overall.

6.

Under the collision theory, the particles must collide with ____ and ____ for a reaction to occur.

a)

sufficient rate and sufficient energy

b)

sufficient surface area and correct orientation

c)

sufficient catalyst and sufficient energy

d)

sufficent energy and correct orientation

7.

The catalyst alters the rate of a chemical reaction by,

a)

providing an alternative pathway with a lower E_a

b)

changing the products formed in the direction of the reaction

c)

providing a surface on which the molecules react

d)

increasing the frequencies of collisions between molecules

8.

What would the rate constant of the reaction be given the following set of experiments?

a)

b)

c)

d)

9.

What states that when an equilibrium is stressed, it will proceed in the direction that will relieve the stress?

a)

Rate law

b)

Equilibrium Constant

c)

Le Chatelier's principle

d)

Constant law

10.

If a reaction has the same number of gas particles in the reactants and in the products, how will increasing pressure affect the reaction?

a)

it will become product favored

b)

it will become reactant favored

c)

it will have no effect

11.

-log[H⁺] is used to find...

a)

pH of acid

b)

pH of base

c)

both

d)

neither

12.

Which of the following expressions is the correct equilibrium-constant expression for the following equilibrium reaction?

N₂ (g) + 3H₂ (g) ⇌ 2NH₃ (g)

a)

$K_c=\frac{\left[NH_3\right]^2}{\left[N_2\right]\left[H_2\right]^3}$

b)

$K_c=\frac{\left[NH_3\right]^3}{\left[N_2\right]\left[H_2\right]^2}$

c)

$K_c=\frac{\left[NH_3\right]^{ }}{\left[N_2\right]\left[H_2\right]^{ }}$

d)

$K_c=\frac{\left[N_2\right]_{ }\left[H_2\right]^3\ \ \ \ }{\left[NH_3\right]^2}$

13.

The K_eq for the equilibrium reaction: 2HI (g) ⇌ H₂ (g) + I₂ (g) is 0.020.

What is the value of K_eq for the reaction? H₂ (g) + I₂ (g) ⇌ 2HI (g) K_eq=?

a)

$2.5\times10^3$

b)

50.

c)

-50.

d)

0.020

14.

Which one of the following is the weakest acid?

a. Acetic acid K_a = 1.8 × 10^-5b. HNO₂ K_a = 4.5 × 10^-4

c. HClO K_a = 3.0 × 10^-8d. HCN K_a = 4.9 × 10^-10

e. HF K_a = 6.8 × 10^-4

a)

d

b)

a

c)

b

d)

c

e)

e

15.

Of the following substances, an aqueous solution of _____ will form acidic solution.

NH₄Br NaNO₃ NaF

a)

NaF only

b)

NaNO₃only

c)

NH₄Br only

d)

all three

e)

NaNO₃ and NaF only

16.

The pH of a 0.10 M aqueous solution of aceticic acid, HC₂H₃O₂, at 25.0 °C is 3.20. What is the value of K_a for acetic acid?

a)

$4.0\times10^{-6}$

b)

$4.0\times10^{-4}$

c)

$2.0\times10^{-6}$

d)

$4.0\times10^{-5}$

17.

Which of the following acids (listed with K_a values) and their conjugate base would form a buffer with a pH of 2.00?

HIO₃, K_a = 1.7 × 10^-1

HClO, K_a = 2.9 × 10^-8

HF, K_a= 3.5 × 10^-4

HClO₂, K_a = 1.1 × 10^-2

a)

HF

b)

HClO

c)

HIO₃

d)

HClO₂

18.

Calculate the pH of a buffer solution prepared by dissolving 0.050 mol of acetic acid and 0.25 mol of sodium acetate in water sufficient to yield 1.00 L of solution. The K_a of acetic acid is 1.76 × 10^-5.

a)

4.75

b)

5.45

c)

7.75

d)

2.54

19.

The value of ΔG° for a reaction conducted at 25 °C is 5.18 kJ/mol. The equilibrium constant for a reaction is _____ at this temperature.

$K_{eq}=e^{-\frac{\Delta G^{\degree}}{RT}}$

a)

51000

b)

150

c)

50.5

d)

8.1

20.

How many minutes will it take to plate out 18.5 g of Al metal from a solution of Al³⁺ using a current of 15.7 amps in an electrolytic cell?

Al³⁺(aq) + 3 e^- → Al(s)

F = 96500 C/mol

1 Ampere = 1 C/s

a)

411 min

b)

11.1 min

c)

111 min

d)

211 min

21.

What is the $E\degree_{cell}$ for the following galvanic cell?

Zn(s)ǀZn²⁺(1.0 M) ║Cu²⁺ (1.0 M) │Cu(s)

E˚(Zn²⁺/Zn) = -0.76 V

E˚(Cu²⁺/Cu) = + 0.34 V

a)

0.76 V

b)

1.10 V

c)

-0.42 V

d)

0.90 V

e)

o.34 V

22.

What is the IUPAC name of the organic compound given here?

a)

propanoic acid

b)

2-propanone

c)

acetone

d)

ethanol

e)

Propanol

23.

What is this structure called? This is a building block of nucleic acid.

a)

nucleotide

b)

fatty acid

c)

monosaccharide

d)

amino acid

Final Exam Review_General Chemistry II

Total questions: 23

Worksheet time: 19mins

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