Today is Wednesday,October 28th, 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

• 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 non-polar?– 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 dipole-dipole 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).