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Home My courses Chemistry CHEM115-1237-W15 March 1 - March 7 Quiz #8

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CHEM115: PRIN OF CHEM:STRUCT &REACTIV (Q) Jay R. Stork [W15]

Started on Monday, March 9, 2015, 12:32 AMState Finished

Completed on Monday, March 9, 2015, 12:51 AMTime taken 19 mins 10 secs

Points 7.00/10.00Grade 14.00 out of 20.00 (70%)

Which of the following elements is a metalloid?

Select one:a. B

b. Al

c. Se

d. Ca

e. Kr

Draw the Lewis formula for SeF . What term describes the shape of this species?

Select one:A. square planar

B. see-saw

C. tetragonal pyramid

D. octahedral

E. tetrahedral

List the following molecules in order of decreasing bond polarity. HI, HF, HCl, HAt,HBr

4

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Select one:A. HCl > HF > HBr > HI > HAt

B. HF > HCl > HBr > HI > HAt

C. HCl > HBr > HI > HAt > HF

D. HAt > HI > HBr > HCl > HF

E. HBr > HI > HAt > HCl > HF

Which of the following molecules contains a polar covalent bond?

Select one:a. SrCl

b. CH

c. F

d. CH O

e. C H

What is the formal charge on the nitrogen atom in NF ?

Select one:a. -3

b. +3

c. -2

d. +2

e. 0

Which of the following is the best Lewis structure for SO ?(Let your Prof. know if the images don't work.)

I) II)

2

4

2

2

2 4

3

2

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III) IV) V)

Select one:A. III

B. IV

C. II

D. V

E. I

Which of the following statements is incorrect?

Select one:a. Ionic bonding results from the transfer of electrons from one atom toanother

b. Linear molecules cannot have a net dipole moment

c. The electrons in a polar bond are found nearer to the more electronegativeelement

d. A molecule with very polar bonds can be nonpolar

e. Dipole moments result from the unequal distribution of electrons in amolecule

Of the following elements, which is most likely to form a negative ion with charge-1?

Select one:a. Si

b. Cl

c. Ca

d. P

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e. Ba

Calculate the enthalpy of formation of CH OH using the following bond energies.

C-H = 414 kJH-O = 463 kJO-O = 494 kJH-H = 435 kJC-O = 335 kJ

1/2 O (g) + 2 H (g) + C(g) H C-O-H(g)

Select one:A. 923 kJ

B. -923 kJ

C. -555 kJ

D. -676 kJ

E. -740 kJ

List the following molecules in order of increasing bond strength.

EDIT: Sorry. This is a bad question. None of these answers are correct.Answer it anyway! Because many people have already taken the quiz, thisone is a freebie as long as you answer it. The correct answer would be:

Br < Cl < F < O < N

In order to get this answer, you have to think about the atomic radii and alsothat the Lewis Structures have F with a single bond, O with a double bond,and N with a triple bond.

Select one:a. Br < Cl < O < N < F

b. O < N < F < Br < Cl

c. Cl < N < Br < O < F

d. O < N < F < Cl < Br

e. F < N < O < Cl < Br

Finish review

3

2 2 3

2 2 2 2 2

2 2

2

2 2 2 2 2

2 2 2 2 2

2 2 2 2 2

2 2 2 2 2

2 2 2 2 2

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