Name: _________________________________
Per: _____
Date: ___________
Quiz – Polarity, Naming & Molecular Geometry
1. A bond formed between a potassium atom and a fluorine atom is likely to be ____.
A.
B.
C.
D.
ionic
metallic
nonpolar covalent
polar covalent
2. Which of the following covalent bonds is the least polar?
A. C—F
B. N— H
C. O—H
D. Br—I
H
H
C Cl
Cl
3. Which is the best description of the molecule dichloromethane (CH2Cl2)?
A.
B.
C.
D.
nonpolar ionic
polar ionic
polar covalent
nonpolar covalent
4. The water molecule is polar because
it contains two polar single bonds and…
A.
B.
C.
D.
the dipoles cancel out symmetrically.
form in opposite directions.
form by transferring electrons in bonds.
the molecule has an asymmetrical, bent shape.
5. What is the formula for phosphorus tetrafluoride?
A.
B.
C.
D.
PF5
PF4
PF6
P7F
6. What is the formula for carbon monoxide?
A.
B.
C.
D.
CO2
C2O2
CMO
CO
7. Name the compound PH3.
A.
B.
C.
D.
phosphorus trihydrogen
phosphorus trihydride
monophosphorus hydrogen
phosphohydride
8. Name the compound Se2Cl6 .
A.
B.
C.
D.
diselenium hexachloride
diselenide hexachlorine
selenium pentachlorine
diselenium tetrachloride
HONORS ONLY
Questions 9-13 refer to the following four molecules. Draw the Lewis structure for each molecule.
You may use the same answer more than once.
(A) NH3
(B) CF2Cl2
(C) BH3
9. Which molecule has a trigonal planar molecular geometry?
10. Which molecule has bond angles of 180o ?
11. Which molecule has a tetrahedral molecular geometry?
(D) HCN
12. What molecular geometry is shown by the ethyne molecule, C2H2 ?
A. linear
B. trigonal planar
C. tetrahedral
D. bent
13. Which of the following molecules displays a bond angle close to 109.5o ?
A. C2H4
B. NH3
C. BF3
D. CO2
Answer Key
1.
2.
3.
4.
5.
A
D
C
D
B
6. D
7. B
8. A
9. C
10. D
11. B
12. A
13. B