Chemistry Homework Sheet (Page 2 of 3) in pdf

____ 13. The number of unshared pairs of electrons in the outer shell of arsenic in AsF

is ____.

a. One

b. two

c. three

d. four

e. zero

____ 14. Assign a formal charge to each atom of

a. As = 5+, Cl = 1-

b. As = 5-, Cl = 7+

c. As = 0, Cl = 0

d. As = 4+, Cl = 1-

e. As = 6+, Cl = 2-

____ 15. Which of the following statements about Lewis structures is false?

a. Carbon and oxygen may form a double bond.

b. Any Noble gas involved in a bond must be violating the octet rule.

c. N, P and As can sometimes share more than 8 e

d. H can never make more than one bond.

e. Quadruple bonds are not possible.

____ 16. Which response lists all the molecules below that have one unshared pair of electrons on the central

atom, and no other molecules?

H O, NF , BF , OF

a. H O

b. NF

c. NF

and OF

d. H O, NF , and OF

e. H O and NF

____ 17. Which one of the following violates the octet rule?

a. PCl

b. ClF

c. CCl

d. BCl

e. AsCl

____ 18. How many resonance structures does the nitrate ion, NO -, have?

a. 1

b. 2

c. 3

d. 4

e. 0

____ 19. Which response includes all of the molecules that have nonpolar bonds, and no others?

Cl , BeCl , I , BrCl, BCl

a. Cl , BeCl , and I

b. Cl and I

c. Cl , BeCl , and BrCl

d. BeCl

and BCl

e. BrCl

____ 20. The elements of Group VIIA may react with each other to form covalent compounds. Which of the

following single covalent bonds in such compounds is the most polar bond?

Electronegativities of the first four Group VIIA elements are: F = 4.0, Cl = 3.0, Br = 2.8, I = 2.5

a. F-F

b. F-Cl

c. F-Br

d. F-I

e. Cl-I

____ 21. Which molecule contains the least polar bonds?

(Electronegativities: H = 2.1, C = 2.5, F = 4.0, Cl = 3.0, Br = 2.8, I = 2.5)

a. CF

b. CCl

c. CBr

d. CI

e. CH

____ 22. Which molecule would have the weakest dipole moment?

a. HBr

b. HF

c. HI

d. H

e. HCl

____ 23. Which of the following molecules has the most ionic bond character?

a. NCl

b. F

c. HF

d. ClF

e. HCl

____ 24. What kind of bond does the transfer of electrons between atoms produce?

a. nonpolar covalent

b. polar covalent

c. ionic

d. coordinate covalent

____ 25. An ionic bond is most likely to be formed between

a. a metal of low ionization energy and a nonmetal of low (very positive) electron

affinity.

b. a metal of high ionization energy and a nonmetal of high (very negative)

electron affinity.

c. a metal of high ionization energy and a nonmetal of low (very positive)

electron affinity.

d. a metal of low ionization energy and a nonmetal of high (very negative)

electron affinity.

Chemistry Homework Sheet Page 2

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