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Chem. Final Exam (Sem.2 ) Review

Total questions: 40

Worksheet time: 56mins

Name
Class
Date
1.
What is the new pressure of 150 mL of a gas that is compressed to 50 mL when the original pressure was 3.0 atm and the temperature is held constant?
a)

100 atm

b)

0.90 atm

c)

1.0 atm

d)

9.0 atm

2.

How many moles of Helium gas are present in 67.8L?

(1 mole = 22.4 L)

a)

4 moles

b)

10 moles

c)

3.02 moles

d)

13.6 moles

3.
Calculate the approximate volume of a 1.50 mol sample of gas at 288K and a pressure of 3.75 atm. (R = 0.0821 L*atm/mol*K)
a)

1.73 L

b)

5.93 L

c)

8.65 L

d)

9.46 L

4.
A tank that has a total pressure of 18.9 atm contains 3.6 atm of helium, 9.7 atm of argon, and an unknown amount of xenon. What is the partial pressure of xenon in the tank?
a)

12.8 atm

b)

13.3 atm

c)

5.6 atm

d)

6.1 atm

5.

What would be the pH of a solution that has an [H+] concentration of 1 x 10-4M?

a)

0.9

b)

1.0

c)

4.0

d)

10.0

6.
What is the total pressure in a tank of gas that contains a mixture of oxygen, nitrogen, and hydrogen at 2.3atm, 4.5 atm, and 9.1atm respectively?
a)
15.9 atm
b)
3.7 atm
c)
13.2 atm
d)
10.1 atm
7.
If a container holds 4.5 moles of oxygen gas at a volume of 45.7L and the volume is decreased to 37.1L, what is the new amount of moles?
a)
6.7 moles
b)
1.5 moles
c)
8.3 moles
d)
3.65 moles
8.
What is the percent yield if in the lab 23.4 grams of magnesium chloride are collected, but theoretically 34.9 grams of magnesium chloride should have been collected?
a)
149%
b)
67.05%
c)
35%
d)
10%
9.
How many moles are present in a solution of 2.3L with a concentration of 0.5M?
a)
3.4 moles
b)
1.15 moles
c)
5.2 moles
d)
1.9 moles
10.
What is the concentration of [H+] of an acid with a pH of 4.6?
a)
2.5x10^-5M
b)
3.6x10^-4M
c)
7.2x10^-9M
d)
1.8x10^-3M
11.

A sample of 0.0255 mol potassium hydroxide, KOH, was dissolved in water to yield 0.01L of solution. What is the molarity of the solution? (M= n/V))

a)

2.55 M

b)

2.55 x 10^-3 M

c)

392 M

d)

0.392 M

12.
What coefficients are needed to correctly balance the equation shown? __Mg + __HCl → __MgCl2 + __H2
a)
2, 2, 1, 1
b)
2, 6, 2, 3
c)
1, 3, 2, 1
d)
1, 2, 1, 1
13.
_____ represents quantitatively the reactants and products in a chemical reaction
a)
Balanced Chemical Equation
b)
Subscripts
c)
Law of Conservation of Mass
d)
Molar Mass
14.
Which Coefficients correctly balance the equation below? __CH4 + __O2 → __CO2 + __H2O
a)
1,1,1,1
b)
2,1,2,1
c)
1,2,1,2
d)
1,1,2,2
15.
Which of the following is NOT a sign that a chemical reaction has taken place
a)
Gas bubbles are produced
b)
A solid settles out
c)
The substances freezes
d)
The test tube warms
16.
What is the molar mass of Phosphorus?
a)
12.011
b)
30.974
c)
126.904
d)
40.078
17.
What is the molar mass of Carbon?
a)
12.011
b)
30.974
c)
126.904
d)
40.078
18.
What is the molar mass of Calcium?
a)
12.011
b)
30.974
c)
126.904
d)
40.078
19.
What is the molar mass of Iodine?
a)
12.011
b)
30.974
c)
126.904
d)
40.078
20.
Stoichiometry is…
a)
The relationships among the quantities of reactants and products involved in chemical reactions.
b)
Something about numbers
c)
The study of matter and energy
d)
The study of numbers
21.

In the reaction 2 H2 + O2 → 2 H2O how many Liters of hydrogen are needed to react with 4.5x1021 molecules of Oxygen?

a)

1.23 L

b)

0.33 L

c)

24 L

d)

12.7 L

22.

When preparing a solution, the substance that is to be dissolved is called _______.

a)

sloid

b)

liquid

c)

the solvent

d)

the solute

23.

A solution that contains the maximum amount of solute exactly that is soluble at a given temperature is said to be _______.

a)

diluted

b)

Saturated

c)

Supersaturated

d)

unsupersaturated

24.

Water has the nickname _________________ because of its ability to dissolve most solutes.

a)

The amazing solvent

b)

Wonderful water

c)

Dynamo dissolver

d)

The universal solvent

25.

Any substance that does not conduct electricity when in solution is called a(n) _______.

a)

Nonelectrolyte

b)

electrolyte

c)

conductor

d)

Semiconductor

26.

Which of the following physical properties does NOT describe an acid?

a)

contains more hydrogen ions (H+) than hydroxide ions (OH-)

b)

reacts with metals

c)

has a pH of more than 7

d)

tastes sour

27.

Strong acids and bases are those that

a)

hold onto their protons more strongly

b)

Dissociate completely into ions

c)

more completely inhibit polarity in water

d)

Do not dissociate completely into ions

28.

Ag2SO4 is _____ in water. (Reminder: use solubility rules)

a)

Soluble

b)

insoluble

29.

How many grams of NaCl are present in 11.00 moles?

a)

0.4500 g

b)

156.6 g

c)

332.0 g

d)

642.8 g

30.

What is the molar mass of Al2O3?

a)

102 g/mol

b)

113 g/mol

c)

5 g/mol

d)

43 g/mol

31.

Which of the following is not one of the postulates of the kinetic molecular theory for ideal gases?

a)

The collisions between particles are elastic

b)

There is a very strong attraction between gas particles

c)

The particle size is small compared to the space between the particles

d)

The particles are in constant random motion.

32.

What is the molar mass of MgSO4?

a)

116.13 g/mol

b)

272.83 g/mol

c)

111.21 g/mol

d)

120.37 g/mol

33.

Which of the following is not a unit for pressure?

a)

Atm

b)

Liters

c)

Torr

d)

KPa

34.

What information do we need to perform a calculation of Gibbs Free Energy?

a)

Enthalpy of the reaction.

b)

Entropy of the reaction.

c)

The temperature of the reaction in Kelvin.

d)

All of the above are needed.

35.
A sample of gas has an initial volume of 34.8 mL and an initial temperature of 315 K. What is the new volume if the temperature is increased to 559 K? Assume constant pressure and the amount for the gas.
a)
0.062 L
b)
.009 L
c)
0.505 L
36.

How many nitrogen atoms are there in 150 grams of dinitrogen trioxide, N2O3N_2O_3 ? (MM=76 g/mol)

a)

6.0x10236.0x10^{23}

b)

1.2x10231.2x10^{23}

c)

1.2x10241.2x10^{24}

d)

2.4x0242.4x0^{24}

37.

Which of the following incorrectly classifies the strength of the acids or bases?

a)

H2SO3,H_2SO_3, Weak Acid

b)

HBr, HBr,\ Strong Acid

c)

Al(OH)3, Al(OH)_3,\ Strong Base

d)

KOH, KOH,\ Strong Base

38.
Which of the following is not a statement that describes The Kinetic Theory of Gases?
a)
Gases consist of tiny particles that are in constant motion.
b)
The average speed of a gas particle is dependent on the temperature of the gas.
c)
There are interactive forces between particles of gas.
d)
Gas particles are constantly colliding with each other and the walls of their container.
39.
What type of reaction is shown in the reaction pathway?
a)
endothermic reaction
b)
exothermic reaction
40.

Find the enthalpy of formation (ΔHrxn ) for the following chemical reaction.

2Al (s) + Fe2O3 (s) --> Al2O3 (s) + 2Fe (s)

a)

-847.6 kJ

b)

847.6 kJ

c)

2492 kJ

d)

-2492 kJ

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