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Exam 2 Form 2, Schemes and Mind Maps of Chemistry

Louisiana State University at AlexandriaChemistry

An exam with multiple-choice questions related to various chemistry topics, including chemical reactions, formula weights, combustion reactions, solution concentrations, and ionic equations. The questions cover a wide range of concepts, such as balancing chemical equations, calculating masses and volumes, determining molecular formulas, and identifying spectator ions. The level of difficulty suggests this exam is likely intended for a university-level chemistry course, potentially at the undergraduate level. The document could be useful for students preparing for similar exams, as it provides practice problems and the opportunity to test their understanding of fundamental chemistry principles.

Typology: Schemes and Mind Maps

2020/2021

Uploaded on 12/01/2023

olivia-charpentier
olivia-charpentier 🇺🇸

6 documents

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Exam 2 Form 2
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
s
2) Which of the following is the correct formula weight for cobalt (II) chlorate?
A) 197.88 amu
B) 142.38 amu
C) 225.62 amu
D) 241.62 amu
E) none of these
3) Propane, C3H8, is a common fuel used for cooking and home heating. What mass of O2 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
4) 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
2.75 𝑚𝑚𝑚𝑚𝑚𝑚 𝑁𝑁𝑁𝑁4𝐶𝐶2𝑁𝑁3𝑆𝑆2∗
77.09 𝑔𝑔 𝑁𝑁𝑁𝑁
4
𝐶𝐶
2
𝑁𝑁
3
𝑆𝑆
2
1 𝑚𝑚𝑚𝑚𝑚𝑚
= 211.99 𝑔𝑔 𝑁𝑁𝑁𝑁4𝐶𝐶2𝑁𝑁3𝑆𝑆2
𝐶𝐶𝑚𝑚2+(𝐶𝐶𝑚𝑚𝑆𝑆
3
−1)
2
= 𝐶𝐶𝑚𝑚(𝐶𝐶𝑚𝑚𝑆𝑆
3
)
2
Co + 2*Cl + 6*O
= 58.93 amu +2* 35.45 amu + 6*16.00 amu
= 225.83 amu
C
3
H
8
+ 5O
2
-> 3CO
2
+ 4H
2
O
0.60 𝑔𝑔 𝐶𝐶3𝑁𝑁8∗ 1 𝑚𝑚𝑚𝑚𝑚𝑚 𝐶𝐶3𝑁𝑁8
44.09 𝑔𝑔 𝐶𝐶3𝑁𝑁8
∗ 5 𝑚𝑚𝑚𝑚𝑚𝑚 𝑆𝑆2
1 𝑚𝑚𝑚𝑚𝑚𝑚 𝐶𝐶3𝑁𝑁8
∗32.00𝑔𝑔 𝑆𝑆2
1 𝑚𝑚𝑚𝑚𝑚𝑚 𝑆𝑆2
= 2.18 𝑔𝑔 𝑆𝑆2
pf3
pf4
pf5

Partial preview of the text

Download Exam 2 Form 2 and more Schemes and Mind Maps 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

3

4

2

4

B) 𝐶𝐶𝐶𝐶

3

4

4

3

3

3

4

4

C) 𝐶𝐶𝐶𝐶

2

4

3

4

2

3

2

3

3

4

2

4

D) 𝐶𝐶𝐶𝐶

2

3

3

4

2

4

2

4

3

4

2

3

E) none of these

s

2) Which of the following is the correct formula weight for cobalt (II) chlorate?

A) 197.88 amu

B) 142.38 amu

C) 225.62 amu

D) 241.62 amu

E) none of these

3) 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

4) 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

2

3

2

4

2

3

2

4

2

3

2

2+

(𝐶𝐶𝑚𝑚𝑆𝑆 3

−

) 2

3

2

Co + 2Cl + 6O

= 58.93 amu +2* 35.45 amu + 6*16.00 amu

= 225.83 amu

C

3

H

8

+ 5O

2

-> 3CO

2

+ 4H

2

O

3

8

3

8

3

8

2

3

8

2

2

2

5) 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

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 ) 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) 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

2

2

2

3

8

2

3

8

3

8

3

8

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

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

= 285.33 g/mol

% O =

𝑝𝑝𝑝𝑝𝑝𝑝𝑝𝑝

𝑤𝑤ℎ𝑜𝑜𝑜𝑜𝑜𝑜

3∗16. 00

  1. 33

12) 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

13) How many bromide atoms are in 12.8 g of AlBr3?

A) 6.02 𝑥𝑥 10

23

B) 2.89 𝑥𝑥 10

22

C) 8.67 𝑥𝑥 10

22

D) 7.40 𝑥𝑥 10

22

E) none of these

14) 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

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

Fe(NO 3 ) 2 and KOH are mixed.

A) Fe(NO 3 ) 2 (aq) + 2KOH (aq) → Fe(OH) 2 (s) + 2KNO 3 (aq)

B) 2(NO

3

(aq) + 2K

(aq) → 2K

(aq) + 2(NO

3

(aq)

C) Fe

(aq) + 2(OH)

→ Fe(OH)

2

(s)

D) Fe

(aq) + 2(NO 3 )

(aq) + 2K

(aq) + 2(OH)

(aq) → Fe(OH) 2 (s) + 2K

(aq) + 2(NO 3 )

(aq)

E) No reaction occurs.

12.8 𝑔𝑔 AlBr 3

1 𝑚𝑚𝑚𝑚𝑚𝑚 AlBr 3

266.68 𝑔𝑔 AlBr 3

6.02 x 10

23

molecules AlBr 3

1 𝑚𝑚𝑚𝑚𝑚𝑚 AlBr 3

1 𝑚𝑚𝑚𝑚𝑚𝑚𝐹𝐹𝑚𝑚𝑚𝑚𝐶𝐶𝐹𝐹 AlBr 3

22

𝑎𝑎𝑎𝑎𝑚𝑚𝑚𝑚𝑎𝑎 𝑚𝑚𝑜𝑜 𝐵𝐵𝐶𝐶

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 =

  1. 35 x 10−2 M∗. 700 L

  2. 75 𝑀𝑀

V1 = 5.4 x 10

L = 5.4 mL

16) Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of K2S

and Fe(NO3)2 are mixed.

A) Fe2+(aq) + S2-(aq) + 2 K+(aq) + 2 NO

(aq) → FeS(s) + 2 K

+(aq) + 2 NO3-(aq)

B) Fe2+(aq) + S2-(aq) + 2 K+(aq) + 2 NO

(aq) → Fe

2+(aq) + S2-(aq) + 2 KNO3(s)

C) K+(aq) + NO

(aq) → KNO

3(s)

D) Fe2+(aq) + S2-(aq) → FeS(s)

E) No reaction occurs.

17) Cyclooctane is 85.6% C and 14.4% H by mass with a molar mass of 112.2 g/mol. What is its

molecular formula?

A) C 8 H 12

B) C

8

H

16

C) C

9

H

4

D) C 7 H 14

E) none of these

18) How many grams of barium chloride are there in 45.0 mL of a 1.90 M aqueous solution of

barium chloride?

A) 3.

B) 0.

C) 17.

D) 6.

E) none of these

Assume 100 g sample

1 𝑚𝑚𝑜𝑜𝑜𝑜 𝐶𝐶

  1. 01 𝑔𝑔 𝐶𝐶

=7.13 mol C

1 𝑚𝑚𝑜𝑜𝑜𝑜 𝐻𝐻

  1. 008 𝑔𝑔 𝐻𝐻

=14.3 mol H

C : H

Empirical formula CH 2

Empirical formula weight 14.03 g/mol

Molecular weight / Empirical Weight =

  1. 2 𝑔𝑔/𝑚𝑚𝑜𝑜𝑜𝑜

  2. 03 𝑔𝑔/𝑚𝑚𝑜𝑜𝑜𝑜

Molecular Formula (CH 2

8

= C

8

H

16

2

2

2

2

2

2

2

2

22) How many molecules of fructose (C6H12O6) are contained in 14.5 mL of 0.140 M fructose

solution?

A) 6.02 × 1023 molecules C6H12O

B) 1.22 × 1021 molecules C6H12O

C) 1.22 × 1024 molecules C6H12O

D) 5.46 × 1025 molecules C6H12O

E) none of these

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

A) Mg2+ and Cl-

B) Mg2+ and H+

C) H+ and OH-

D) H+ and Cl-

E) none of these

24) How many moles of calcium carbonate are in 25.3 mL of 0.997 M solution?

A) 26.

B) 0.

C) 0.

D) 25.

E) none of these

25) Which of the following is a strong electrolyte?

2

3

6

2

2

3

2

5

A) BaCl2 and Li2CO

B) C3H6O2, HBr, and N2O

C) C3H6O2 and N2O

D) BaCl2, HBr, and Li2CO

E) none of the these

14.5 𝑚𝑚𝐿𝐿 C6H12O

. 140 𝑚𝑚𝑚𝑚𝑚𝑚 C

6H12O

23

𝑚𝑚𝑚𝑚𝑚𝑚𝐹𝐹𝑚𝑚𝐶𝐶𝑚𝑚𝐹𝐹𝑎𝑎 C6H12O

1 𝑚𝑚𝑚𝑚𝑚𝑚 C6H12O

21

𝑚𝑚𝑚𝑚𝑚𝑚𝐹𝐹𝑚𝑚𝐶𝐶𝑚𝑚𝐹𝐹𝑎𝑎 C 6

H

O

3

3

3

3

3

3