Today is Wednesday,
th
October 28 , 2015
Pre-Class:
Find the worksheet that has that problem we
skipped (#6) – it’s called Covalent Bonding
Worksheet (lots of covalent dot structures).
Please also find your notebooks and calculators
and turn in any homework done on paper.
Today’s Agenda
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Review
Review
Institutionalized discrimination?
Review
Review Game Rules
• I will ask a question to the class.
• Each participant (that’s you) writes down the
answer silently.
– Not each group…each individual.
• After a few moments, I will say, “Compare
answers.”
• Each of you will look at what the other wrote.
Review Game Rules
• Did you each get the right answer?
– 2 points.
• Did one of you get the right answer?
– 1 point.
• Neither of you?
– For shame. 0 points.
– And eternal guilt.
Review Game Rules
• The List of Do Nots:
– Do not talk to each other, make noises, gesture,
give answers (my discretion here) between when
the question has been read and when I say,
“Compare answers.”
• Doing so will result in a disqualification for that round.
Don’t believe me? Try it.
– Do not fall asleep when I’m getting scores.
• If you’re not paying attention, I’m not giving you points.
Review Question 1
• Calculate the total bond dissociation energy for a
molecule of CO2.
• C—O
– 360
• C=O
– 736
• O=O
– 498
• 1472 (736 + 736).
Review Question 2
• Why is NH4+ tetrahedral while NH3 is trigonal
pyramidal?
– NH4+ (ammonium ion) has four bonding atoms
and no unshared pairs. NH3 (ammonia) has three
bonding atoms and one unshared pair, forcing the
pyramidal shape.
Review Question 3
• What kind of bond exists between sodium and
sulfur?
– Ionic.
Review Question 4
• What is the formula for the bond between
sodium and sulfur?
– Na2S.
Review Question 5
• What is the name of the compound between
sodium and sulfur?
– Sodium sulfide.
Review Question 6
• How many electrons does each sulfur give
away as the compound forms?
• 0.
Review Question 7
• How many electrons does each sulfur receive
as the compound forms?
• 2.
Review Question 8
• What is the charge on each sulfur atom?
• 2-.
Review Question 9
• What is the charge on each sodium atom?
• 1+.
Review Question 10
• BONUS NON-CHEMISTRY QUESTION
– With a link to chemistry.
• You may wager any/all of your points.
• Category: Investing
• Which company has the same stock-ticker
symbol as the symbol for fluorine on the
periodic table?
– Ford Motor Company.
Review Question 11
• What kind of bond exists between an oxygen
atom and two hydrogen atoms?
– Covalent (or molecular) bond.
Review Question 12
• Are the bonds single, double, triple or a
combination of the three?
– Single.
Review Question 13
• What is the name of a compound with the
formula H2O according to the traditional
naming system we’ve learned in this class?
– Dihydrogen monoxide.
Review Question 14
• How many total valence electrons are there in
dihydrogen monoxide?
– Eight.
Review Question 15
• How many unshared pairs AND bonded atoms
are there in a molecule of dihydrogen
monoxide?
– 2 unshared pairs.
– 2 bonded atoms.
Review Question 16
• According to VSEPR theory, what shape does a
molecule of dihydrogen monoxide take?
– Bent.
Review Question 17
• What’s the name of dihydrogen monoxide (in
our daily lives)?
– Water.
Review Question 18
• BONUS NON-CHEMISTRY QUESTION
• You may wager any/all of your points
• Category: Political History
• Apartheid was a significant sociopolitical
dividing system in place in which country from
1948 to 1993?
– South Africa.
Review Question 19
• What is the name of this compound? PbF2
– Lead (II) fluoride.
Review Question 20
• What is the name of this compound? NO
– Nitrogen monoxide.
Review Question 21
• What is the name of this compound? BaCO3
– Barium carbonate.
Review Question 22
• What is the name of this compound? H2CO3
– Carbonic acid.
Review Question 23
• What is the name of this ion? Ca2+
– Calcium ion.
Review Question 24
• What is the name of this ion? F– Fluoride ion.
Review Question 25
• What is the name of this ion? Co3+
– Cobalt (III) ion.
Review Question 26
• What is the name of this compound? HF
– Hydrofluoric acid.
Review Question 27
• BONUS NON-CHEMISTRY QUESTION
• You may wager any/all of your points.
• Category: Literature
• Who wrote the Sherlock Holmes series?
(Note: You can receive credit with only a last
name)
– Sir Arthur Conan Doyle.
Review Question 28
• Is the bond between carbon and oxygen a
polar covalent bond?
• Carbon Electronegativity: 2.5
• Oxygen Electronegativity: 3.5
– Yes.
Review Question 29
• How many unshared pairs of electrons are
there in a molecule of carbon dioxide?
– None.
Review Question 30
• According to VSEPR theory, what shape does a
molecule of carbon dioxide take?
– Linear.
Review Question 31
• Is a molecule of carbon dioxide polar or nonpolar?
– Non-polar. Though each bond is a polar bond, the
linear, symmetrical shape makes the whole
molecule non-polar. The polarity “cancels out.”
Review Question 32
• BONUS NON-CHEMISTRY QUESTION
• You may wager any/all of your points.
• Category: 20th Century History
• The Cuban Missile Crisis occurred while which
President was in office?
– Kennedy.
Review Question 33
• Which types of molecules do not have London
Dispersion forces?
– None. They all do.
Review Question 34
• When would you expect to encounter dipoledipole interactions?
– With polar molecules.
Review Question 35
• Hydrogen bonding occurs when an atom of
hydrogen is directly bonded to one of which
three atoms?
– Nitrogen, Oxygen, or Fluorine.
Review Question 36
• Would CCl4 make a crystal, polar covalent
bond, or non-polar covalent bond?
– Non-polar covalent bond.
Review Question 37
• According to VSEPR theory, what molecular
shape would CCl4 take?
– Tetrahedral.
Review Question 38
• What is the name of this compound? CdCl2
– Cadmium chloride
Review Question 39
• What kind of bond exists between zinc and
copper?
– Metallic.
Review Question 40
• BONUS NON-CHEMISTRY QUESTION
• You may wager any/all of your points.
• Category: U.S. Presidents
• Name three of the four U.S. Presidents that
have been assassinated while in office.
– Lincoln (1865), Garfield (1881), McKinley (1901),
Kennedy (1963).