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Announcements

• Audio 0:00:32.424965
• Test tonight
  • Bring pencil, photo id, calculator
  • You can start as late as 7 and you can’t leave until 7
  • Material from end of chapter 3 to end of chapter 6
  • Coulomb’s Law is physics
    • Only expects you to understand the directions / relative magnitudes of charges (no calculations)

Clicker 1

• Audio 0:05:31.262428
• According to VSEPR theory, which one of the following molecules should have a molecular geometry that is trigonal bipyramidal?
  • SF4
  • XeF4
  • NF3
  • SF6
  • PF5
• The answer is PF5 because it is the only answer with five atoms attached to the central atom

Representing Three-Dimensional Shapes on Paper

• Audio 0:07:41.096639
• Drawing molecules to show their dimensionality on paper (2-D) is difficult.
• How to draw a 3-D representation of molecule on paper:
  • By convention, the central atom is put in the plane of the paper.
  • Put as many other atoms as possible in the same plane and indicate with a straight line.
  • For atoms in front of the plane, use a solid wedge.
  • For atoms behind the plane, use a hashed wedge
• 

Illustrations of Molecular Geometries of Molecules Using 3-D Notations

• Audio 0:10:13.039414
• 

Multiple Central Atoms and Their Geometries

• Audio 0:11:15.077734
• Many molecules have larger structures with many interior atoms.
  • Looking at “multiple center atoms”
  • Think of them as having multiple central atoms.
• For multiple center molecules:
  • Each center atom has a designated a shape.
• Example: Glycine
• The shape around the:
  • N atom is trigonal pyramidal
  • Left C is tetrahedral
  • Right C is trigonal planar
  • O is bent
• 

Clicker 2

• Audio 0:15:17.202864
• Which species has the highest ionization energy?
  • A) Mg
  • B) Mg+
  • C) Mg2+
  • D) Al+
  • E) Al2+

C

Clicker 3

• Audio 0:16:45.881866
• Give the ground state electron configuration for the ion of Ba
  • [Kr] 5s24d105p6

Clicker 4

• Audio 0:19:07.805288
• Which reaction below represents the electron affinity of Li?
  • Answer in Recitation questions

Clicker 5

• Audio 0:20:44.692817
• a) Na+
• b) Ga3+
• c) K+
• d) Mg2+
• e) Ca2+
  • C

Clicker 6

• Audio 0:23:43.818176
• a) titanium (II) carbonate
• b) titanium carbide
• c) titanium carbonite
• c) titanium (II) carbonite
• a

Clicker 7

• Audio 0:26:11.549016
• Calculate the molar mass of Al(C2H3O2)3
  • a) 86.03 g/mol
  • b) 204.13 g/mol
  • c) 56.00 g/mol
  • d) 258.09 g/mol
  • e) 139.9 g/mol
• B

Clicker 8

• Audio 0:29:32.460732
• How many atoms of oxygen are contained in 47.6 g of Al2(CO3)3? The molar mass of Al2(CO3)3 is 233.99 g/mol
• We have 1/5th of a mol of Al2(CO3)3. There are nine mols of oxygen in one molecule. = 9 * avogandros number

Clicker 9

• Audio 0:33:28.381248
• Determine the empirical formula for a compound that is 36.86% N and 63.14% O by mass. (O:15.999, N:14.0007)
• N2O3

Clicker 10

• Audio 0:34:36.281792
• Determine the molecular formula of a compound that is 49.48% carbon, 5.19% hydrogen,28.85% nitrogen, and 16.48% oxygen. The molecular weight is 194.19 g/mol

Clicker 11

• Audio 0:38:58.435866
• Which of the following reactions is associated with the lattice energy of CaS?
  • Ca(s) + S(s) -> CaS(s)
  • CaS(s) + S(s) -> CaS(s)
  • Ca2-(aq) + S2-(aq) -> CaS(s)
  • Ca2-(g) + S2-(g) -> CaS(s)
• D

Clicker 11

• Choose the bond below that is the least polar
• P-F
• C-Br
• C-F
• C-I
• C-Cl
• Want to find the least electronegative difference
• D

Clicker 12

• Which of the following resonance structures for OCN- will contribute most to the correct structure of OCN-?
• A) O(3 lone pairs) - C N(with 1 lone pair)

Vocab

Term	Definition
solid wedge	3D representation for drawing molecular structures which represents a bond coming out of the page
solid hatched	3D representation for drawing molecular structures which represents a bond going into the page
straight line	representation for drawing molecular structures which represents a bond in plane of the drawing surface