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Exam 2 Form 3, Summaries of Chemistry

Louisiana State University at Alexandria Chemistry

An exam with multiple-choice questions related to chemistry topics such as chemical reactions, molar mass, combustion, and solution concentration. The questions cover a range of concepts including balancing chemical equations, calculating the mass or volume of reactants and products, determining molecular formulas, and identifying strong electrolytes. The level of difficulty suggests this exam is likely intended for a university-level chemistry course. A good opportunity to assess students' understanding of fundamental chemical principles and their ability to apply them to solve quantitative and conceptual problems.

Typology: Summaries

2022/2023

Uploaded on 12/01/2023

olivia-charpentier 🇺🇸

6 documents

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Exam 2 Form 3

1) A double displacement reaction between chromium (III) sulfate and ammonium carbonate

produces chromium (III) carbonate and ammonium sulfate. Select the balanced equation for this

reaction.

A) 𝐶𝐶𝐶𝐶2(𝑆𝑆𝑆𝑆4)3 (𝑎𝑎𝑎𝑎)+ (𝑁𝑁𝑁𝑁4)2𝐶𝐶𝑆𝑆3(𝑎𝑎𝑎𝑎) → 𝐶𝐶𝐶𝐶2(𝐶𝐶𝑆𝑆3)3+ (𝑁𝑁𝑁𝑁4)2𝑆𝑆𝑆𝑆4

B) 𝐶𝐶𝐶𝐶3𝑆𝑆𝑆𝑆4 (𝑎𝑎𝑎𝑎) + 𝑁𝑁𝑁𝑁4𝐶𝐶𝑆𝑆3(𝑎𝑎𝑎𝑎) → 𝐶𝐶𝐶𝐶3𝐶𝐶𝑆𝑆3+ 𝑁𝑁𝑁𝑁4𝑆𝑆𝑆𝑆4

C) 𝐶𝐶𝐶𝐶2(𝑆𝑆𝑆𝑆4)3 (𝑎𝑎𝑎𝑎)+ 3(𝑁𝑁𝑁𝑁4)2𝐶𝐶𝑆𝑆3(𝑎𝑎𝑎𝑎) → 𝐶𝐶𝐶𝐶2(𝐶𝐶𝑆𝑆3)3+ 3(𝑁𝑁𝑁𝑁4)2𝑆𝑆𝑆𝑆4

D) 𝐶𝐶𝐶𝐶2(𝑆𝑆𝑆𝑆3)3 (𝑎𝑎𝑎𝑎)+ 3(𝑁𝑁𝑁𝑁4)2𝐶𝐶𝑆𝑆4(𝑎𝑎𝑎𝑎) → 𝐶𝐶𝐶𝐶2(𝐶𝐶𝑆𝑆4)3+ 3(𝑁𝑁𝑁𝑁4)2𝑆𝑆𝑆𝑆3

E) none of these

2) What is the molar mass of copper (II) carbonate?

A) 187.11 g/mol

B) 182.95 g/mol

C) 123.56 g/mol

D) 183.57 g/mol

E) none of these

3) What is the mass in grams of 2.75 mol of NH4C2H3O2?

A) 212 g

B) 3.57 x 10-2 g

C) 28.0

D) 251 g

E) none of these

4) Calculate the number of grams of propane (C3H8) consumed in 14.9 g of CO2 is produced

according to its combustion reaction.

A) 36.5 g

B) 24.4 g

C) 18.2 g

D) 9.11 g

E) none of these

14.9 𝑔𝑔 𝐶𝐶𝑆𝑆2∗ 1 𝑚𝑚𝑚𝑚𝑚𝑚 𝐶𝐶𝑆𝑆2

44.01 𝑔𝑔 𝐶𝐶𝑆𝑆2 ∗ 1 𝑚𝑚𝑚𝑚𝑚𝑚 𝐶𝐶3𝑁𝑁8

3 𝑚𝑚𝑚𝑚𝑚𝑚 𝐶𝐶𝑆𝑆2

∗44.09 𝑔𝑔 𝐶𝐶3𝑁𝑁8

1 𝑚𝑚𝑚𝑚𝑚𝑚 𝐶𝐶3𝑁𝑁8

= 4.98 𝑔𝑔 𝐶𝐶3𝑁𝑁8

𝐶𝐶𝐶𝐶

2+

𝐶𝐶𝑆𝑆3

2−

= 𝐶𝐶𝐶𝐶𝐶𝐶𝑆𝑆3

Cu + C + 3*O

= 63.55 + 12.011 + 3*16.00

= 123.56

2.75 𝑚𝑚𝑚𝑚𝑚𝑚 𝑁𝑁𝑁𝑁4𝐶𝐶2𝑁𝑁3𝑆𝑆2∗

77.08 𝑔𝑔 𝑁𝑁𝑁𝑁

4

𝐶𝐶

2

𝑁𝑁

3

𝑆𝑆

2

1 𝑚𝑚𝑚𝑚𝑚𝑚

= 211.99 𝑔𝑔 𝑁𝑁𝑁𝑁4𝐶𝐶2𝑁𝑁3𝑆𝑆2

Partial preview of the text

Download Exam 2 Form 3 and more Summaries Chemistry in PDF only on Docsity!

1) A double displacement reaction between chromium (III) sulfate and ammonium carbonate

produces chromium (III) carbonate and ammonium sulfate. Select the balanced equation for this

reaction.

A) 𝐶𝐶𝐶𝐶

2

4

3

4

2

3

2

3

4

2

4

B) 𝐶𝐶𝐶𝐶

3

4

3

4

C) 𝐶𝐶𝐶𝐶

2

4

3

4

2

3

2

3

4

2

4

D) 𝐶𝐶𝐶𝐶

2

3

4

2

4

2

4

3

4

2

3

E) none of these

2) What is the molar mass of copper (II) carbonate?

A) 187.11 g/mol

B) 182.95 g/mol

C) 123.56 g/mol

D) 183.57 g/mol

E) none of these

3) What is the mass in grams of 2.75 mol of NH 4 C 2 H 3 O 2?

A) 212 g

B) 3.57 x 10

g

C) 28.

D) 251 g

E) none of these

4) Calculate the number of grams of propane (C 3 H 8 ) consumed in 14.9 g of CO 2 is produced

according to its combustion reaction.

A) 36.5 g

B) 24.4 g

C) 18.2 g

D) 9.11 g

E) none of these

2

3

8

2

3

8

3

8

3

8

2+

𝐶𝐶𝑆𝑆 3

2−

3

Cu + C + 3*O

4

2

3

2

4

2

3

2

4

2

3

2

5) Calculate the number of grams of barium sulfate produced if 54.9 g of barium chloride reacts

completely according to the reaction below:

BaCl 2 (aq) + Na 2 SO 4 (aq) -> 2NaCl (aq) + BaSO 4 (s)

A) 49.6 g

B) 34.1 g

C) 23.5 g

D) 30.8 g

E) none of these

6) How much KNO

3

in grams can be produced from the reaction below, given a solution containing

15.0 g of Fe(NO 3 ) 3 and 15.0 g of KOH?

Fe(NO

3

(aq) + 3KOH (aq) —> Fe(OH)

3

(s) +3KNO

3

(aq)

A) 18.8 g

B) 27.0 g

C) 9.52 g

D) 15.7 g

E) none of these

7) Calculate the number of grams of nitrogen gas produced from the detonation of 275.0 g of TNT

(C

7

H

5

N

3

O

6

), given the following reaction:

2C 7 H 5 N 3 O 6 (s) —> 12 CO (g) + 5 H 2 (g) + 3 N 2 (g) + 2 C (s)

A) 22.62 g

B) 33.9 g

C) 50.9 g

D) 50.89 g

E) none of these

2

4

2

4

3

275.0 𝑔𝑔 C

7

H

5

N

3

O

6

1 𝑚𝑚𝑚𝑚𝑚𝑚 C

7

H

5

N

3

O

6

227.14 𝑔𝑔 C

7

H

5

N

3

O

6

2

2 𝑚𝑚𝑚𝑚𝑚𝑚 C

7

H

5

N

3

O

6

2

11) Propane, C

3

H

8

, is a common fuel used for cooking and home heating. What mass of O

2

in grams

is consumed in the combustion of 0.60 g of propane?

A) 0.44 g

B) 2.2 g

C) 1.09 g

D) 3.3 g

E) none of these

12) Aluminum trichloride, AlCl

3

, is formed from the reaction of Al

2

O

3

(s) with HCl gas. The balanced

reaction is

Al 2 O 3 (s) + 6 HCl (g) → 2 AlCl 3 (s) + 3 H 2 O (g)

When 2.40 kg of Al

2

O

3

is reacted with excess HCl until it is all consumed, 4.56 kg of AlCl

3

are

recovered after the reaction is completed. What is the percent yield for this experiment?

A) 49.1 %

B) 52.6 %

C) 77.9 %

D) 72.7 %

E) none of these

13) What is the percentage of oxygen in morphine, C 17 H 19 NO 3. Express your answer in percent to

three significant figures.

A) 5.61 %

B) 16.8 %

C) 17.9 %

D) 68.6 %

E) none of these

C

3

H

8

+ 5O

2

-> 3CO

2

+ 4H

2

O

3

8

3

8

3

8

2

3

8

2

Al 2 O 3 (s)+6HCl(g)→2AlCl 3 (s)+3H 2 O(g)

2.40 𝑘𝑘𝑔𝑔 Al 2 O 3 ∗

1 𝑚𝑚𝑚𝑚𝑚𝑚 Al 2 O 3

101.96 𝑔𝑔 Al 2 O 3

3

1 𝑚𝑚𝑚𝑚𝑚𝑚 Al 2 O 3

3

% yield =

𝑎𝑎𝑎𝑎𝑎𝑎𝑎𝑎𝑎𝑎𝑚𝑚

𝑎𝑎ℎ𝑒𝑒𝑚𝑚𝑒𝑒𝑒𝑒𝑎𝑎𝑒𝑒𝑎𝑎𝑎𝑎𝑚𝑚

56 𝑘𝑘𝑔𝑔
27 𝑘𝑘𝑔𝑔

FW (C 17 H 19 NO 3 ) = 17 * C + 19 * H + N +3* O

= 285.33 g/mol

% O =

𝑝𝑝𝑎𝑎𝑒𝑒𝑎𝑎

𝑤𝑤ℎ𝑚𝑚𝑚𝑚𝑒𝑒

3∗16. 00

33

14) What is the molarity of a solution that is made by dissolving 2.95 g of sucrose (C

12

H

22

O

11

) in

sufficient water to form 275.0 mL of solution?

A) 3.13 x 10

M

B) 4.53 x 10

M

C) 2.37 x 10

M

D) 3.13 x 10

M

E) 2.36 M

15) What volume (in mL) of a 1.75 M stock solution of glucose must be used to make 700.0 mL of

a 1.35×

M glucose solution in water?

A) 5.4 x 10

B) 5.

C) 0.

D) 33.

E) none of these

16) What mass (in g) of AgCl is formed from the reaction of 55.0 mL of a 0.109 M AgC2H3O2 solution

with 55.0 mL of 0.078 M MgCl2 solution?

2 AgC2H3O2(aq) + MgCl2(aq) → 2 AgCl(s) + Mg(C

2H3O2)2(aq)

A) 0.838 g B) 1.72 g C) 0.859 g D) 1.23 g E) none of these

17) Give the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of

lithium sulfide and copper (II) nitrate are mixed.

A) Li+(aq) + SO

2-(aq) + Cu+(aq) + NO3-

(aq) → CuS(s) + Li

+(aq) + NO3-(aq)

B) 2 Li+(aq) + S2-(aq) + Cu2+(aq) + 2 NO

(aq) → CuS(s) + 2 Li

+(aq) + 2 NO3-(aq)

C) 2 Li+(aq) + S2-(aq) + Cu2+(aq) + 2 NO

(aq) → Cu

2+(aq) + S2-(aq) + 2 LiNO3(s)

D) Li+(aq) + S-(aq) + Cu+(aq) + NO

(aq) → CuS(s) + LiNO

3(aq)

E) No reaction occurs.

Molarity = mol/L

2.95 𝑔𝑔 C12H22O11∗

1 𝑚𝑚𝑚𝑚𝑚𝑚 C12H22O

342.3 𝑔𝑔 C12H22O

.275 𝐿𝐿

M1 V1 = M2 V

1.75M (V1) = 1.35 x 10

M (.700 L)

V1 =

35 x 10−2 M∗. 700 L
75 𝑀𝑀

V1 = 5.4 x 10

L = 5.4 mL

2

3

2

3

2

3

2

3

2

. 0550 L 𝑀𝑀𝑔𝑔𝐶𝐶𝑚𝑚

2

078 𝑚𝑚𝑚𝑚𝑚𝑚 𝑀𝑀𝑔𝑔𝐶𝐶𝑚𝑚 2

1 𝐿𝐿 𝑀𝑀𝑔𝑔𝐶𝐶𝑚𝑚 2

2 𝑚𝑚𝑚𝑚𝑚𝑚 𝐴𝐴𝑔𝑔𝐶𝐶𝑚𝑚

1 𝑚𝑚𝑚𝑚𝑚𝑚 𝑀𝑀𝑔𝑔𝐶𝐶𝑚𝑚 2

32 𝑔𝑔 𝐴𝐴𝑔𝑔𝐶𝐶𝑚𝑚

1 𝑚𝑚𝑚𝑚𝑚𝑚 𝐴𝐴𝑔𝑔𝐶𝐶𝑚𝑚

Exam 2 Form 3, Summaries of Chemistry

Related documents

Partial preview of the text

Download Exam 2 Form 3 and more Summaries Chemistry in PDF only on Docsity!

1) A double displacement reaction between chromium (III) sulfate and ammonium carbonate

produces chromium (III) carbonate and ammonium sulfate. Select the balanced equation for this

reaction.

A) 𝐶𝐶𝐶𝐶

B) 𝐶𝐶𝐶𝐶

C) 𝐶𝐶𝐶𝐶

D) 𝐶𝐶𝐶𝐶

E) none of these

2) What is the molar mass of copper (II) carbonate?

A) 187.11 g/mol

B) 182.95 g/mol

C) 123.56 g/mol

D) 183.57 g/mol

E) none of these

3) What is the mass in grams of 2.75 mol of NH 4 C 2 H 3 O 2?

A) 212 g

B) 3.57 x 10

g

C) 28.

D) 251 g

E) none of these

4) Calculate the number of grams of propane (C 3 H 8 ) consumed in 14.9 g of CO 2 is produced

according to its combustion reaction.

A) 36.5 g

B) 24.4 g

C) 18.2 g

D) 9.11 g

E) none of these

5) Calculate the number of grams of barium sulfate produced if 54.9 g of barium chloride reacts

completely according to the reaction below:

BaCl 2 (aq) + Na 2 SO 4 (aq) -> 2NaCl (aq) + BaSO 4 (s)

A) 49.6 g

B) 34.1 g

C) 23.5 g

D) 30.8 g

E) none of these

6) How much KNO

in grams can be produced from the reaction below, given a solution containing

15.0 g of Fe(NO 3 ) 3 and 15.0 g of KOH?

Fe(NO

(aq) + 3KOH (aq) —> Fe(OH)

(s) +3KNO

(aq)

A) 18.8 g

B) 27.0 g

C) 9.52 g

D) 15.7 g

E) none of these

7) Calculate the number of grams of nitrogen gas produced from the detonation of 275.0 g of TNT

(C

H

N

O

), given the following reaction:

2C 7 H 5 N 3 O 6 (s) —> 12 CO (g) + 5 H 2 (g) + 3 N 2 (g) + 2 C (s)

A) 22.62 g

B) 33.9 g

C) 50.9 g

D) 50.89 g

E) none of these

275.0 𝑔𝑔 C

H

N

O

1 𝑚𝑚𝑚𝑚𝑚𝑚 C

H

N

O

227.14 𝑔𝑔 C

H

N

O

2 𝑚𝑚𝑚𝑚𝑚𝑚 C

H

N

O