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Chem 1010 Hour Exam 2: Sample Questions for Modules 4, 5, & 6, Exams of Chemistry

Sample exam questions for chem 1010 module 4, 5, and 6. The questions cover topics such as enthalpy changes, gas reactions, and neutralization reactions. Students are advised to study their test, handbook modules, and review drill quizzes before taking the exam. Exam conditions include taking it alone, using only a calculator and periodic table, and waiting until completion before checking answers.

Typology: Exams

Pre 2010

Uploaded on 08/16/2009

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Chem 1010 2nd Sample for Hour Exam 2 (Modules 4, 5, & 6) Updated by RBSK, 12/02
You should study your test, study your Handbook modules, and review your drill quizzes BEFORE taking this exam.
When taking it you should do so under exam conditions, i.e. alone, using only a calculator and periodic table, and
waiting until you have completely finished before checking your answers.
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1: What is the density of sulfur dioxide gas at 67˚C and 876 torr? (5-4)
A: 13 g/liter B: 2.0 x 101 g/L C: 2.6 g/liter D: 0.22 g/liter E: 0.38 g/liter
2: What is the molecular weight of a gas if 0.60 g of the substance occupies 200 mL at 27 ˚C and
740 torr? (5-4)
A: 90 B: 76 C: 79 D: 68 E: 72
3: What would be the concentration (in M) of the solution produced when 2.0*102 ml of 0.30 M hydrobromic acid is
diluted to 1.0*103 mL? (4-6,7,8)
A: 0.30 M B: 1.5 M C: 0.060 M D: 40 M E: 0.10 M
4: K-TYPE answer format: Mark a if A,B,C are correct; b if A, C; c if B, D; d if D only; e otherwise.
A: The average velocity of helium atoms is greater at 200˚C than at 100˚C. (5-8)
B: The average kinetic energy of oxygen molecules is greater that of nitrogen dioxide molecules at the same
temperature. (5-8)
C: A sample of oxygen gas at 45˚C and 1.5 atm would be more likely to behave like an ideal gas than would a
sample of oxygen at 45˚C and 2.5 atm. (5-9)
D: If volume and amount of substance are held constant, the temperature in ( oC) and pressure of a gas are
inversely proportional. (5-2)
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Download Chem 1010 Hour Exam 2: Sample Questions for Modules 4, 5, & 6 and more Exams Chemistry in PDF only on Docsity!

You should study your test, study your Handbook modules, and review your drill quizzes BEFORE taking this exam.

When taking it you should do so under exam conditions, i.e. alone, using only a calculator and periodic table, and

waiting until you have completely finished before checking your answers.

1: What is the density of sulfur dioxide gas at 67˚C and 876 torr? (5-4)

A: 13 g/liter B: 2.0 x 101 g/L C: 2.6 g/liter D: 0.22 g/liter E: 0.38 g/liter

2: What is the molecular weight of a gas if 0.60 g of the substance occupies 200 mL at 27 ˚C and

740 torr? (5-4)

A: 90 B: 76 C: 79 D: 68 E: 72

3: What would be the concentration (in M) of the solution produced when 2.0*

ml of 0.30 M hydrobromic acid is

diluted to 1.0*

mL? (4-6,7,8)

A: 0.30 M B: 1.5 M C: 0.060 M D: 40 M E: 0.10 M

4: K-TYPE answer format : Mark a if A,B,C are correct; b if A, C; c if B, D; d if D only; e otherwise.

A: The average velocity of helium atoms is greater at 200˚C than at 100˚C. (5-8)

B: The average kinetic energy of oxygen molecules is greater that of nitrogen dioxide molecules at the same

temperature. (5-8)

C: A sample of oxygen gas at 45˚C and 1.5 atm would be more likely to behave like an ideal gas than would a

sample of oxygen at 45˚C and 2.5 atm. (5-9)

D: If volume and amount of substance are held constant, the temperature in (

o C) and pressure of a gas are

inversely proportional. (5-2)

You should study your test, study your Handbook modules, and review your drill quizzes BEFORE taking this exam.

When taking it you should do so under exam conditions, i.e. alone, using only a calculator and periodic table, and

waiting until you have completely finished before checking your answers.

5: Given: 2 Cl 2

O(g) + 3 O 2

(g) ➞ 4 ClO 2

(g), DH = 249.4 kJ

2 Cl 2

(g) + 1 O 2

(g) ➞ 2 Cl 2

O(g), DH = 160.6 kJ

On the basis of this information, what is the enthatlpy change for the reaction

1 Cl 2

(g) + 2 O 2

(g) ➞ 2 ClO 2

(g)? (6-8)

A: 205.0 kJ B: 88.8 kJ C: -88.8 kJ D: 338.2 kJ E: -71.8 kJ

6: How many mL of 0.20 M calcium hydroxide are needed to completely neutralize 75.0 mL of 0.25 M hydrofluoric acid?

A: 9.4 x 10

mL B: 1.9 x 10

mL C: 3.0 x 10

mL D: 4.7 x 10

mL E: 7.5 x 10

mL

7: Choose the correct statements from the following using K-TYPE answer format. I.E. Mark a if A,B,C are

correct; b if A, C; c if B, D; d if D only; e otherwise.

A: It would be possible to add water to a solution with a concentration of 0.20 M and produce a solution with a

concentration of 0.40 M.

B: A sample of gas which exerts 1 atm in a 1 liter container at 0

o C contains twice as many particles as a sample

which exerts 0.5 atm in a 1 liter container at 0

o C. (5-10)

C: In a 0.1 M potassium chloride solution, the solute is water.

D: According to the kinetic molecular theory of gases, no attractive or repulsive forces operate between gas

molecules. (5-8)

8: For the reaction, N 2

(g) + 2 O 2

(g) ➞ 2 NO 2

(g) , the enthalpy change is 33.9 kJ/mole of NO 2

formed. What is the

enthalpy change (in kJ) when 55.0 grams of oxygen react in this manner?

A: 58.0 kJ B: 117 kJ C: 29.1 kJ D: 94.0 kJ E: 227 kJ

You should study your test, study your Handbook modules, and review your drill quizzes BEFORE taking this exam.

When taking it you should do so under exam conditions, i.e. alone, using only a calculator and periodic table, and

waiting until you have completely finished before checking your answers.

13: On the diagram below: X = 400 J, "A" represents reactants, "B" represents products.

B

A

6X_

5X_

4X_

3X_

2X_

X_

0_

E n t h a l p y

Choose the correct statements

regarding the diagram to the

right using K-TYPE answer

format:

Mark a if A, B, & C are correct.

b if A and C are correct.

c if B and D are correct.

d if D only is correct.

e otherwise.

A: The reaction diagrammed is endothermic. (6-6)

B: The enthalpy change for the reaction to the right is approximately -1600 J. (6-6)

C: Heat (enthalpy) of vaporization is the energy change when a given amount of a substance changes from gas to

liquid at a constant pressure. (6-4)

D: The enthalpy of the reactants is approximately 2000 J. (6-6)

14: Calculate the enthalpy change for the following reaction. (6-10)

CaO (s) + CO 2

(g) ➞ CaCO 3

(s)

A: 2236 kJ B: –178.1 kJ C: 178.1 kJ D: –2236 kJ E: –966.1 kJ

15: A gas initially at 1.68 atm and occupying 16.4 L at 67.0 °C is expanded to 26.4 L and the pressure is decreased to

0.948 atm. What is the final temperature? (5-5)

A: 697 °C B: -154 °C C: 35.8 °C D: 101 °C E: 60.9 °C

16: ( CHALLENGE ) A certain gas diffuses through a long tube in 13.93 minutes. The same volume of hydrogen takes

9.90 minutes to diffuse through the apparatus. What is the molecular weight of the unknown gas? (5-Challenge)

A: 2.84 B: 1.02 C: 1.44 D: 2.00 E: 4.