Exam 1
• Tuesday 9/29 6:10-8:00 pm CHEM 1650
• Bring a non-programmable calculator
• You will be provided the last two pages of
the course pack
• Practice problems posted on website
• Exam ethics
Exam Topics
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Through lab TOMORROW
Homework answer key posted
Scientific definitions (fact, law, etc.)
Scientific method
Unit conversions; significant figures
Mole
Atoms (historical experiments, subatomic
particles, size, orbitals, electron
configurations)
• Elements, molecules
• Periodic table (trends)
Next Chemical Scholarship
Assignment
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Work in new group
Presented in Section on Wednesday 10/5
Briefing on chemically modified food
Goals
– Explore use of chemistry in food
– Tie examples to class topics
– Determine most controversial and most
beneficial
Topics
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Trans fats
MSG
Nitrates
Homogenized milk
Vitamin D in OJ
Fluoride in water
Fortified flour
Iodized salt
Brief
• What is the modification (chemical structures as
appropriate)
• Why it is done?
• How it the food modified?
• What food products does it appear in?
• Tie in some aspect of this chemistry course
(elements, periodic trends, bonding, intermolecular
forces, thermochemistry)
• A brief history (how, when, and where did it all get
started?)
• Is it FDA approved?
• Summarize the modification advantages and
disadvantages
• Brief us on any debate surrounding the modification
(explain the positions that people hold and why they
hold them). How heated is the debate?
Misc.
• 7 minutes total
• Who’s talking?
– Background
– Debate
– Answers to questions
– Questions
• Power point available
Grading (20 points)
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4 points (what, how, where, when)
4 citations including scientific study and results
4 debate
2 tie to chemistry studied in class
2 (1 point each) question answered
2 (1 point each) question asked
2 presentation (volume, clarity, effectiveness)
Exam 2
Tuesday, October 25 6:10-8:00 pm CHEM 1650
• Lewis structures; VSEPR
• Bonding; Polarity Intermolecular forces
• Thermochemistry
– Calorimetry
– Phase change
– Heats of formation; enthalpy of reactions
• Aqueous Solutions
– concentration units
– colorimetry
– precipitation
Group Evaluations
• September (everyone got 9 in-class
points)
• October:
– Total points out of total possible*food briefing
grade (9/9)
– Returned today in discussion
• Note 75 possible in-class points to date
Exam 2
18
16
14
12
10
8
6
4
2
0
15-20
Range: 15.5-38.5
Mean: 27.5
Median: 28.5
20-25
25-30
30-35
35-40
If assigning grades…..
• Slide down a grade
– A 550/700
– B 475/700
– C 400/700
– D 325/700
Intermolecular Forces
Lewis Structures
• Common answers:
Thermochemistry
• Heat out of ice
– Water 21.3 to 0oC
– Water to ice (heat of fusion)
– Ice 0.0 to –22oC
• How much propane would you have to burn to
get the same amount of heat
– C3H8 + 5O2  3 CO2 + 4 H2O
– What is DH of reaction?
– kJ/mol C3H8 to grams C3H8
Team problem
• qice = - qbeer
• qice = Melt ice + raise temp of water
• qbeer = 6 bottles + ethanol + water