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exam dor chem on chapter 1 - 2, Exams of Chemistry

Louisiana State University at AlexandriaChemistry

lkwdhOAShfcAJNSfc;AYdqefADvfcADfAD

Typology: Exams

2019/2020

Uploaded on 12/01/2023

olivia-charpentier
olivia-charpentier 🇺🇸

6 documents

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bg1
Exam 2 Form 1
1) A double displacement reaction between ammonium carbonate and iron (II) nitrate produces
iron (II) carbonate and ammonium nitrate. Select the balanced equation for this reaction.
A) (𝑁𝑁𝑁𝑁4)2𝐶𝐶𝐶𝐶3 (𝑎𝑎𝑎𝑎)+𝐹𝐹𝐹𝐹(𝑁𝑁𝐶𝐶3)2 (𝑎𝑎𝑎𝑎)→ 2 𝑁𝑁𝑁𝑁4𝑁𝑁𝐶𝐶3 (𝑎𝑎𝑎𝑎)+𝐹𝐹𝐹𝐹𝐶𝐶𝐶𝐶3 (𝑠𝑠)
B) 𝑁𝑁𝑁𝑁4𝐶𝐶𝐶𝐶3 (𝑎𝑎𝑎𝑎)+𝐹𝐹𝐹𝐹2𝑁𝑁𝐶𝐶3 (𝑎𝑎𝑎𝑎)→ 𝑁𝑁𝑁𝑁4𝑁𝑁𝐶𝐶3 (𝑎𝑎𝑎𝑎)+𝐹𝐹𝐹𝐹2𝐶𝐶𝐶𝐶3 (𝑠𝑠)
C) (𝑁𝑁𝑁𝑁4)2𝐶𝐶𝐶𝐶3 (𝑎𝑎𝑎𝑎)+𝐹𝐹𝐹𝐹(𝑁𝑁𝐶𝐶3)2 (𝑎𝑎𝑎𝑎)→ 𝑁𝑁𝑁𝑁4𝑁𝑁𝐶𝐶3 (𝑎𝑎𝑎𝑎)+𝐹𝐹𝐹𝐹𝐶𝐶𝐶𝐶3 (𝑠𝑠)
D) (𝑁𝑁𝑁𝑁4)2𝐶𝐶𝐶𝐶4 (𝑎𝑎𝑎𝑎)+𝐹𝐹𝐹𝐹(𝑁𝑁𝐶𝐶4)2 (𝑎𝑎𝑎𝑎)→ 2 𝑁𝑁𝑁𝑁4𝑁𝑁𝐶𝐶4 (𝑎𝑎𝑎𝑎)+𝐹𝐹𝐹𝐹𝐶𝐶𝐶𝐶4 (𝑠𝑠)
E) none of these
2) What is the molar mass of cobalt (II) nitrate?
A) 168.94 g/mol
B) 182.95 g/mol
C) 179.87 g/mol
D) 152.94 g/mol
E) none of these
3) What is the mass in grams of 3.25 mol of NH4C2H3O2?
A) 212 g
B) 28.0 g
C) 23.7 g
D) 251 g
E) none of these
4) Calculate the number of grams of propane (C3H8) consumed in 17.7 g of water produced
according to its combustion reaction.
A) 10.8 g
B) 9.11 g
C) 8.91 x 10-2 g
D) 28.9 g
E) none of these
𝐶𝐶𝐶𝐶2+(𝑁𝑁𝐶𝐶
3
−1)
2
= 𝐶𝐶𝐶𝐶(𝑁𝑁𝐶𝐶
3
)
2
= Co + 2* N + 6*O
= 58.93+2*14.01+6*16.00
= 182.95 g/mol
3.25 𝑚𝑚𝐶𝐶𝑚𝑚 𝑁𝑁𝑁𝑁4𝐶𝐶2𝑁𝑁3𝐶𝐶2∗
77.083 𝑔𝑔 𝑁𝑁𝑁𝑁
4
𝐶𝐶
2
𝑁𝑁
3
𝐶𝐶
2
1 𝑚𝑚𝐶𝐶𝑚𝑚
= 251 𝑔𝑔 𝑁𝑁𝑁𝑁4𝐶𝐶2𝑁𝑁3𝐶𝐶2
C
3
H
8
+ 5O
2
-> 3CO
2
+ 4H
2
O
17.7 𝑔𝑔 𝑁𝑁2𝐶𝐶 ∗ 1 𝑚𝑚𝐶𝐶𝑚𝑚 𝑁𝑁2𝐶𝐶
18.02 𝑔𝑔 𝑁𝑁2𝐶𝐶 ∗ 1 𝑚𝑚𝐶𝐶𝑚𝑚 𝐶𝐶3𝑁𝑁8
4 𝑚𝑚𝐶𝐶𝑚𝑚 𝑁𝑁2𝐶𝐶∗44.09 𝑔𝑔 𝐶𝐶3𝑁𝑁8
1 𝑚𝑚𝐶𝐶𝑚𝑚 𝐶𝐶3𝑁𝑁8
= 10.8 𝑔𝑔 𝐶𝐶3𝑁𝑁8
pf3
pf4
pf5

Partial preview of the text

Download exam dor chem on chapter 1 - 2 and more Exams Chemistry in PDF only on Docsity!

1) A double displacement reaction between ammonium carbonate and iron (II) nitrate produces

iron (II) carbonate and ammonium nitrate. Select the balanced equation for this reaction.

A) (𝑁𝑁𝑁𝑁

4

2

3

3

2

4

3

3

B) 𝑁𝑁𝑁𝑁

4

3

2

3

4

3

2

3

C) (𝑁𝑁𝑁𝑁

4

2

3

3

2

4

3

3

D) (𝑁𝑁𝑁𝑁

4

2

4

4

2

4

4

4

E) none of these

2) What is the molar mass of cobalt (II) nitrate?

A) 168.94 g/mol

B) 182.95 g/mol

C) 179.87 g/mol

D) 152.94 g/mol

E) none of these

3) What is the mass in grams of 3.25 mol of NH

4

C

2

H

3

O

2

A) 212 g

B) 28.0 g

C) 23.7 g

D) 251 g

E) none of these

4) Calculate the number of grams of propane (C 3 H 8 ) consumed in 17.7 g of water produced

according to its combustion reaction.

A) 10.8 g

B) 9.11 g

C) 8.91 x 10

g

D) 28.9 g

E) none of these

2 +

(𝑁𝑁𝐶𝐶 3

−

) 2

3

2

= Co + 2* N + 6*O

= 182.95 g/mol

4

2

3

2

4

2

3

2

4

2

3

2

C

3

H

8

+ 5O

2

-> 3CO

2

+ 4H

2

O

2

2

2

3

8

2

3

8

3

8

3

8

5) Calculate the number of grams of sodium chloride produced if 75.3 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) 21.1 g

B) 268 g

C) 10.6 g

D) 42.3 g

E) none of these

6) How much Fe(OH) 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

3

(aq) + 3KOH (aq) —> Fe(OH)

3

(s) +3KNO

3

(aq)

A) 6.63 g

B) 27.0 g

C) 9.52 g

D) 15.7 g

E) none of these

7) Calculate the number of grams of carbon monoxide 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) 50.89 g

B) 85.78 g

C) 135.6 g

D) 203.5 g

E) none of these

2

2

2

2

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

275.0 𝑔𝑔 C

7

H

5

N

3

O

6

1 𝑚𝑚𝐶𝐶𝑚𝑚 C

7

H

5

N

3

O

6

227.14 𝑔𝑔 C

7

H

5

N

3

O

6

2 𝑚𝑚𝐶𝐶𝑚𝑚 C

7

H

5

N

3

O

6

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 0.90 g of propane?

A) 0.65 g

B) 2.2 g

C) 1.63 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 3.55 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 carbon in oxycodone, C 18 H 21 NO 4. Express your answer in percent

to three significant figures.

A) 3.81 %

B) 16.8 %

C) 69.5 %

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

2

2

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

3.55 𝑘𝑘𝑔𝑔 Al 2 O 3 ∗

1 𝑚𝑚𝐶𝐶𝑚𝑚 Al 2 O 3

101.96 𝑔𝑔 Al 2 O 3

3

1 𝑚𝑚𝐶𝐶𝑚𝑚 Al 2 O 3

3

3

3

% yield =

𝑎𝑎𝑎𝑎𝑎𝑎𝑎𝑎𝑎𝑎𝑚𝑚

𝑎𝑎ℎ𝑒𝑒𝑚𝑚𝑒𝑒𝑒𝑒𝑎𝑎𝑒𝑒𝑎𝑎𝑎𝑎𝑚𝑚

  1. 56 𝑘𝑘𝑔𝑔

  2. 28 𝑘𝑘𝑔𝑔

FW (C 18 H 21 NO 4 ) = 18 * C + 21 * H + N + 4* O

= 315.36 g/mol

% C =

𝑝𝑝𝑎𝑎𝑒𝑒𝑎𝑎

𝑤𝑤ℎ𝑚𝑚𝑚𝑚𝑒𝑒

18∗12. 01

  1. 36

14) What is the molarity of a solution that is made by dissolving 3.10 g of sucrose (C

12

H

22

O

11

) in

sufficient water to form 200.0 mL of solution?

A) 4.53 x 10

M

B) 1.81 x 10

M

C) 1.81 M

D) 4.53 x 10

M

E) none of these

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

a 1.67×

M glucose solution in water?

A) 6.

B) 0.

C) 41.

D) 6.68 x 10

E) none of these

16) What mass (in g) of AgCl is formed from the reaction of 55.0 mL of a 0.078 M AgC2H3O

solution with 55.0 mL of 0.109 M MgCl2 solution?

2 AgC2H3O2(aq) + MgCl2(aq) → 2 AgCl(s) + Mg(C2H3O2)2(aq)

A) 0.838 g B) 1.72 g C) 0.859 g D) 0.615 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) 2 Li+(aq) + S2-(aq) + Cu2+(aq) + 2 NO

(aq) → CuS(s) + 2 Li

+(aq) + 2 NO3-(aq)

B) Li+(aq) + SO

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

) → CuS(s) + Li

+(aq) + NO3-(aq)

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

(aq) → CuS(s) + LiNO

3(aq)

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

(aq) → Cu

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

E) No reaction occurs.

Molarity = mol/L

3.10 𝑔𝑔 C12H22O11∗

1 𝑚𝑚𝐶𝐶𝑚𝑚 C12H22O

342.3 𝑔𝑔 C12H22O

.200 𝐿𝐿

M1 V1 = M2 V

1.75M (V1) = 1.67 x 10

M (.700 L)

V1 =

  1. 67 x 10−2 M∗. 700 L

  2. 75 𝑀𝑀

V1 = 6.68 x 10

L = 6.68 mL

2

3

2

2

3

2

2

3

2

2

3

2

. 0550 L 𝑀𝑀𝑔𝑔𝐶𝐶𝑚𝑚

2

  1. 109 𝑚𝑚𝑚𝑚𝑚𝑚 𝑀𝑀𝑔𝑔𝐶𝐶𝑚𝑚 2

1 𝐿𝐿 𝑀𝑀𝑔𝑔𝐶𝐶𝑚𝑚 2

2 𝑚𝑚𝑚𝑚𝑚𝑚 𝐴𝐴𝑔𝑔𝐶𝐶𝑚𝑚

1 𝑚𝑚𝑚𝑚𝑚𝑚 𝑀𝑀𝑔𝑔𝐶𝐶𝑚𝑚 2

  1. 32 𝑔𝑔 𝐴𝐴𝑔𝑔𝐶𝐶𝑚𝑚

1 𝑚𝑚𝑚𝑚𝑚𝑚 𝐴𝐴𝑔𝑔𝐶𝐶𝑚𝑚

22) What are the spectator ions in the reaction between Mg(OH)2 (aq) and HCl (aq)?

A) H+ and OH-

B) H+ and Cl-

C) Mg2+ and H+

D) Mg2+ and Cl-

E) none of these

23) Choose the reaction that represents the combustion of C6H12O2.

A) 6 C(s) + 6 H2(g) + O2(g) → C

6H12O2(l)

B) C6H12O2(l) → 6 C(s) + 6 H2(g) + O2(g)

C) C6H12O2(l) + 8 O2(g) → 6 CO

2(g) + 6 H2O(g)

D) Mg(s) + C6H12O2(l) → MgC

6H12O2(aq)

E) None of the above represents the combustion of C6H12O2.

24) How many moles of calcium carbonate are in 52.5 mL of 0.501 M solution?

A) 26.

B) 0.

C) 0.

D) 25.

E) none of these

25) Which of the following is a strong electrolyte?

2

2

4

2

2

4

3

A) CaCl2 and LiF

B) C2H4O2, H2SO4, and SO

C) CaCl2, LiF, and H2SO

D) C2H4O2 and SO

E) None of the above

3

3

3

3

3

3