Download Answer Sheet to Review Questions

Answer Sheet to Review Questions
Worksheet numbered 1-20 where the first question is
1. Which compounds contain only polar bonds?
Answers:
1. Ignore this question for now, given what we’ve spoken about, technically 1 AND
3 would be correct
2. 4
3. 3
4. 4
5. 4 Remember that diamond = all carbons covalently bonded to each other =
network solid
6. 4
7. 3
8. 1
9. 3
10. 1
11. 2
12. 3
13. 2
14. 2
15. 3
16. 3
17. 2
18. 2
19. 3
20. 4
Worksheet numbered 1-14 where the first question is
1. A compound is made up of iron and oxygen, only. The ratio of iron to oxide ions
is 2:3 in this compound. The IUPAC name for this compound is:
1. C
2 B
3. A
4. D
5. C
6. A
7. B
8. B
9. A
10. D
11. B
12. C
13. D
14. D
Back of the Worksheet I handed out this past Thursday/Friday
Molecular Type of
Lewis-Dot Structure
Name of Compound
Formula
bonding
(IonicCovalent)
NaCl
Sodium Chloride
Ionic
Predominant
Intermolecular
Force (ignore
if ionic)
Ignore
CO2
Covalent
Carbon Dioxide
Dispersion
Forces.
SrBr2
Ionic
Strontium Bromide
Ignore
KBr
Ionic
Potassium Bromide
Ignore
CCl4
Covalent
Carbon Tetrachloride
Dispersion
Forces.
NH3
Covalent
Nitrogen trihyrdride
(ammonia)
Hydrogen
Bonding
CH4
Covalent
Carbon
Dispersion
tetrahyrdride( methane) Forces.
Answers to 113-116 in Review Book (RED BOOK WITH GRAINY BLUE/BLACK
PICTURES)
Answers:
1. 4
2. 2
3. 3
4. 1
5. 3
6. 3
7. 3
8. 2
9. 3
10. 2
11. 1
12. 3
13. 1
14. 2
15. 3
16. 4
17. 3
18. 1
19. 3
20. 2
21. 1
22. 2
23. 1
24. 4
25. 2
26. 1
27. 1
28. 3
29. 2
30.
31. Fluorine has a higher electronegativity value than iodine and therefore has a greater
pull on the shared electrons causing the bond to be more polar.
32. Sulfur (S)
33. It is a symmetrical molecule
34. The electronegativity values of C and O are different and produce a polar bond,
while the two fluorine atoms have the same electronegativity and produce a nonpolar
bond.
35.
36. The extrapolated boiling point appears to be -70oC. The attractive forces between
water molecules holding them in the liquid phase are hydrogen bond, which are stronger
than dipole-dipole attractions between the other molecules.
37. Diagrams of the molecules should be like the ammonia molecule. Dotted lines
(NOT COVALENT BONDS) connect the Nitrogen atom of one molecule to the
to the Hydrogen atoms of another molecule.
38.
Ethane (C2H6)
Ethene (C2H4)
Ethyne (C2H2)
CH4
Answers to Lewis-Dot Structure Sheet (Handout from Thanksgiving Week)
Name:
Period:
For the following compounds fill in the following table:
Nonpolar covalent = electronegativity difference between the two bonding atoms is 0.
Intermolecular forces. 1. Hydrogen Bonding. 2. Dipole-Dipole. 3. Dispersion Forces
Lewis Structure
Molecular Identify polar and Molecular Predominant (most
Polarity
significant)
Geometry nonpolar covalent
(Yes/No)
intermolecular
bonds (Atomforce
Atom)
Tetrahedral C-H = polar
No
Dispersion forces
Br2
Linear
Br-Br = nonpolar
No
Dispersion forces
H2O
Bent
O-H = polar
Yes
H-bonding
H2S
Bent
S-H = Polar
Yes
Dipole-Dipole
CO2
Linear
C-O = Polar
No
Dispersion forces
CO
Linear
C-O = Polar
Yes
Dipole-Dipole
Lewis Structure
Molecular
Geometry
Identify polar and
nonpolar covalent
bonds (AtomAtom)
C-H = Polar
C-C = Nonpolar
Molecular
Polarity
(Yes/No)
Predominant
intermolecular
force
No
Dispersion
forces
C2H2
Around each
carbon (Linear)
C2H4
Around each
carbon (Trigonal
Planar)
C-H = Polar
C-C = Nonpolar
No
Dispersion
forces
C2H6
Around each
carbon
(tetrahedral)
C-H = Polar
C-C = Nonpolar
No
Dispersion
forces
CHF3
Tetrahedral
C-H = Polar
C-F = Polar
Yes
Dipole-Dipole
HF
Linear
H-F = Polar
Yes
H-bonding
NH3
Trigonal
Pyramidal
N-H = Polar
Yes
H-bonding
CH3Cl
Tetrahedral
C-H = Polar
C-Cl = Polar
Yes
Dipole-Dipole