Exam 2 Review
Supplemental Instruction
Iowa State University / Leader: / Brett
Course: / Chem 163
Instructor: / Bonacorssi
Date: / 3/9/13

1.  What are the usual shapes of s, p, and d orbitals?

S=circle p=¥ d = four leaf clover

2.  Write the full and abbreviated electron configurations for the following:

  1. Phosphorous

1s22s22p63s23p3 [Ne]3s23p3

  1. Strontium

1s22s22p63s23p64s23d104p65s2 [Kr]5s2

3.  How many valence electrons does sulfur have?

6

4.  Arrange the following in order of increasing atomic radius: Se, Rb, S, and K

S<Se<K<Rb

5.  Arrange the following in order of increasing ionization energy: Se, Rb, S, and K

Rb<K<Se<S

6.  True/False: Covalent bonds share electrons between two atoms.

7.  True/false: To break a bond, energy is released.

8.  Which has the longest bond length?

  1. C2H4 b. C2H6 c. C2H2 d. All the same length

9.  Which has the strongest bond?

  1. C2H4 b. C2H6 c. C2H2 d. All the same strength

10.  Draw all resonance structures for the carbonate ion.

11.  What is the most electronegative element on the periodic table? Fluorine

12.  Determine the difference in electronegativity, and classify the bonds as either ionic, polar covalent, or nonpolar covalent. (F=4.0, Li=0.9, O=3.5, H=2.1)

  1. F2 4-4= 0 nonpolar covalent
  2. LiO2 3.5-.9= 2.6 ionic
  3. H2O 3.5-2.1=1.4 polar covalent
  4. HF 4-2.1=1.9 polar covalent because not between metal and nonmetal

13.  What are the 7 strong acids?

HI, HBr, HCl, HNO3, H2SO4, HClO4, HClO3

14.  Which can have hydrogen bonding?

  1. CH2F2 b. HF c. CH4 d. none of these

15.  Which will have the highest boiling point?

  1. NH3 b. C2H6 c. CH3F d. CO2

16.  Which will have the lowest boiling point?

  1. H2O b. C2H6 c. C3H8 d. HF

17.  Which of these can have dipole-dipole intermolecular forces?(Circle all that apply)

  1. CH4 b. CH2Br2 c. AlCl3 d. NCl3 Polar molecules have dipole dipole

18.  What intermolecular force is shared by all molecules?

London Dispersion force

19.  Fill in this table:

Compound / Lewis-Dot
Structure / # Bonding
#Nonbonding
Pairs / Electronic Shape / Molecular Shape / Bond Angle / Polar or Nonpolar
H2O / 2 bonding
2 nonbonding / tetrahedral / bent / <109.5 / polar
CCl2H2 / 4 bonding
0 nonbonding / tetrahedral / tetrahedral / 109.5 / Polar
AlF3 / 3 bonding
0 nonbonding / Trigonal planar / Trigonal planar / 120 / Nonpolar
CO2 / 2 bonding
0 nonbonding / linear / linear / 180 / nonpolar

20.  Give the name for the following:

  1. H2SO4 sulfuric acid
  2. Li2O lithium oxide
  3. N2O4 dinitrogen tetroxide
  4. MgCO3 magnesium carbonate
  5. Fe2O3 iron (III) oxide
  6. SF6 sulfur hexafluoride
  7. ClO3- chlorate

21.  Provide the chemical formula for the following:

a.  Sodium nitrate NaNO3

  1. Trinitrogen diphosphide N3P2
  2. Titanium (II) chloride TiCl2
  3. Potassium Oxide K2O
  4. Sulfate SO4-2
  5. Perbromic acid HBrO4
  6. Hydrochloric acid HCl
  7. Nitric acid HNO3

22.  For the shell n=4:

  1. How many electrons can be held in this shell? 2n2 =2(42)=32 electrons
  2. For the 4p subshell, how many orbitals are there? 3 orbitals
  3. What is the maximum number of electrons allowed in the 4p subshell? 6 electrons