Valence Electrons - General Chemistry - Quiz, Exercises for Chemistry. Alliance University

Chemistry

Description: Valence Electrons, Lewis Dot Structure, Octet Rule, Greater Electronegativity, Assign Formal Charges, Chemical Structure, Necessary Lone Pairs, Multiple Bonds, Type of Hybridization. This quiz has got few questions and empty space for answers as well. Hints to questions in this quiz are given above.
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1. Draw a reasonable Lewis Dot Structure for each of these species. Show all valence

electrons. None of these require you to violate the octet rule. (16 points)

CO2 NH3 HCN HOOH

2. Draw a reasonable Lewis Dot Structure for each of these species. Show all valence

electrons. Each of these requires you to violate the octet rule. (12 points)

ClF3 SF5 - BeF2

3. Draw a Lewis Dot Structure for the [IO2]- ion and include any resonance if necessary. Make sure your structure is ideal in terms of formal charges (Oxygen has a greater electronegativity than Iodine). (10 points)

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4. Assign formal charges to the elements in each of the structures below. (9 points)

A

B

C

Formal Charge C

N

O

5. (3 pts) The best Lewis structure for CNO – is which one above? A B C 6. Complete the chemical structure below by adding any necessary lone pairs and multiple

bonds. Next, identify the type of hybridization present at each Carbon and at each Oxygen atoms. (10 points)

Cl C

H

H

C

H

C

O C

H

H

C

O

O H

H

Draw arrows to each Carbon and each Oxygen and indicate hybridization.

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7. Based on the Lewis Structures provided, given the electron pair geometry, provide a sketch

of the species along with idealized bond angles, name the molecular geometry, and identify the type of orbital hybridization present on the central atom of the species. (20 points)

Molecule NH3 O3 IF5 IF4+

Lewis Structure

O O O

OOO

Electron pair geometry

Sketch (with angles)

VSEPR Geometry

Hybridization on central

atom

8. In the following list, circle the polar molecules (8 points): NH3 BCl3 SF4 CH4 XeF4 XeF2 SCl2 CO2

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Use the included molecular orbital diagram to help answer the remaining questions. (2pts each)

9. According to molecular orbital theory, what is the bond order in the C2 molecule? _____ 10. Circle one: MO theory predicts that the C2 molecule is diamagnetic or paramagnetic? 11. According to molecular orbital theory, what is the bond order in the C22- ion? _____ 12. Circle one: MO theory predicts that the C22- ion is diamagnetic or paramagnetic? 13. Circle one: According to molecular orbital theory, which one of these species has the shortest

bond length (strongest bond)?

N22+ N2 N22-

14. According to molecular orbital theory, circle any that will be paramagnetic:

N22+ N2 N22-

---------------------------------------------------------------------------------------------------- scratch area for MO questions

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