Quiz 3A - Lecture notes 1-5 PDF

Preview

Summary

notes to help study...

Description

Chemistry 1341 Quiz 3 Form 01

Fall 2018

Name___________________________________ Avogadro's Number = 6.022 x 10 23 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) When the following equation is balanced, the coefficients are ________. NH3 (g) + O2 (g) → NO 2 (g) + H2 O (g) A) 4, 7, 4, 6

B) 2, 3, 2, 3

C) 4, 3, 4, 3

D) 1, 1, 1, 1

1) E) 1, 3, 1, 2 2)

2) When the following equation is balanced, the coefficient of hydrogen is ________. K (s) + H2 O (l) → KOH (aq) + H2 (g) A) 3

B) 2

C) 5

D) 4

E) 1 3)

3) The balanced equation for the decomposition of sodium azide is ________. A) NaN3 (s) → Na (s) + N2 (g) + N (g) B) 2NaN3 (s)

Na2 (s) + 3N2 (g) Na (s) + N2 (g)

→

C) NaN3 (s) → D) 2NaN3 (s) → 2Na (s) + 2N2 (g) E) 2NaN3 (s) → 2Na (s) + 3N2 (g)

4) There are ________ mol of carbon atoms in 4 mol of C 4 H8 O2 . A) 20

B) 16

C) 32

4) D) 4

E) 8

5) What is the empirical formula of a compound that contains 29% Na, 41% S, and 30% O by mass? A) Na2 S2 O6 B) NaSO2 C) NaSO D) Na2 S2 O3 E) NaSO3

5)

6) The combustion of propane (C 3 H8 ) in the presence of excess oxygen yields CO 2 and H2 O:

6)

C3 H8 (g) + 5O2 (g) → 3CO 2 (g) + 4H2 O (g) When 2.5 mol of O 2 are consumed in their reaction, ________ mol of CO 2 are produced. A) 1.5

B) 2.5

C) 5.0

D) 6.0

E) 3.0 7)

7) Calcium carbide (CaC2 ) reacts with water to produce acetylene (C 2 H2 ): CaC2 (s) + 2H2 O (g) → Ca(OH)2 (s) + C 2 H2 (g) The complete reaction of 57.4 g of CaC 2 requires consumption of ________ g of H 2 O. A) 64.1

B) 18.0

C) 0.895

D) 1.79

E) 32.3

8) The formula weight of potassium dichromate (K 2 Cr2 O7 ) is ________ amu. A) 333.08

B) 242.18

C) 294.18

D) 107.09

8) E) 255.08

9) The mass % of F in the binary compound KrF 2 is ________. A) 18.48

B) 81.52

C) 45.38

10) One mole of ________ contains the smallest number of atoms. A) Na3 PO4 B) C10H8 C) Al2 (SO4 )3

Dr. D. Patterson

A-1

9) D) 31.20

E) 68.80

D) S8

E) NaCl

10)

Answer Key Testname: QUIZ 3

1) A 2) E 3) E 4) B 5) D 6) A 7) E 8) C 9) D 10) E

A-2...