Pre-lab quiz for chem 243b

Topics: Acetic acid, Carboxylic acid, Ester Pages: 27 (7460 words) Published: November 3, 2014

Quiz #1
Attempt 1
Written: Jul 7, 2012 9:48 AM - Jul 7, 2012 9:50 AM
Submission View
Your quiz has been submitted successfully.
Question 1 1 / 1 point
At what time do you have to complete your online prelab assignment to be allowed to participate in the lab? Question options:
A week before the lab
Day before the lab at 10 pm
The morning of lab day at 8 am
One hour before the lab
Question 2 1 / 1 point
Which materials/chemicals belong in the desiccator?
Question options:
Drying agents such as anhydrous magnesium sulfate
silicagel 1 M NaOH aqueous standard solution
aqueous extract of your reaction
alumina for chromatography
Question 3 1 / 1 point
Vacuum tubing is the thick-walled black tubing, not the skinny tygon tubing. Question options:
True
False
Question 4 1 / 1 point
Match the letters to the safety equipment. (You have to enter numbers 1-6 as answers)

__3__ C
__4__ D
__6__ F
__2__ B
__5__ E
__1__ A
1. fire extinguisher
2. glass waste box
3. trash can for regular waste
4. safety shower
5. eyewash station
6. dustpan and broom

Attempt Score: 4 / 4 (100.00 %)
Overall Grade (highest attempt): 4 / 4 (100.00 %)
Quiz #1 (3)NMRQuestion 1 1 / 1 point
Equivalent protons in a molecule will result in one NMR signal.  How many NMR signals would you predict for each of the following molecules? __1__ benzene
__2__ 3-pentanone
__4__ toluene
__3__ ethanol
__2__ t-butyl methyl ether
1. 1
2. 2
3. 3
4. 4
Question 2 1 / 1 point
A compound to be analyzed by NMR should be dissolved in a solvent.  Clearly the solvent should not have an NMR signal in the spectral area you are trying to analyze.  Which solvents are appropriate for use in proton NMR? Question options:

Benzene-d6
Chloroform
Carbon tetrachloride
Water
Heavy water (deuterium oxide)
Acetone-d6
Chloroform-d (deuterated chloroform)
View FeedbackQuestion 3 1 / 1 point

How many different signals can you observe in the NMR spectrum of isopropyl methyl ether?    (Just enter the number) Answer: 3 Question 4 1 / 1 point

Based on the structure of isopropyl methyl ether, match the chemical shift to the appropriate protons. __1__ methyl groups in isopropyl moiety
__3__ methyl next to O
__2__ methine proton in isopropyl moiety
1. δ = 1.15 ppm
2. δ = 3.2 ppm
3. δ = 3.3 ppm
Question 5 1 / 1 point
Predict the multiplicity (number of peaks) for the different protons in isopropyl methyl ether. __1__ methyl protons next to O
__2__ methyl protons in isopropyl group
__7__ methine proton in isopropyl group
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
Question 6 1 / 1 point

How many different kinds of protons are present in isobutyl acetate? Answer: 4 Question 7 1 / 1 point

Given the NMR spectrum of isobutyl acetate, match the different types of protons with the correct chemical shifts. __1__ terminal methyl protons in isobutyl group
__4__ methylene protons next to O
__3__ methyl protons next to carbonyl
__2__ methine proton in isobutyl group
1. δ = 1.0 ppm
2. δ = 2.0 ppm
3. δ = 2.3 ppm
4. δ = 3.9 ppm
Question 8 1 / 1 point
You now know which protons correspond to which signals.   For how many protons will each of these signals integrate? __6__ signal at δ 0.95 ppm
__1__ signal at δ 2.0 ppm
__3__ signal at δ 2.2 ppm
__2__ signal at δ 3.9 ppm
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6

Attempt Score: 8 / 8 (100.00 %)
Overall Grade (highest attempt): 8 / 8 (100.00 %)
Quiz #1 DA
Submission View
Your quiz has been submitted successfully.
Question 1 1 / 1 point
Which characteristics does the Diels-Alder reaction display? Question options:
concerted mechanism
results in ring formation
pericyclic reaction
stereospecific product
Question 2 1 / 1 point
Identify each of the following substituents as either electron-donating or electron-withdrawing on an alkene. __2__ -CN
__1__ -OCH3
__2__ -CO-CH3
__1__ -O-cyclohexyl__1__ -CH2CH2(CH3)2
__2__ -COOCH3
__1__ -CH3
1. e-donating
2....
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Chem pre lab Essay
  • Chem Pre-Lab Essay
  • Chem Lab Essay
  • chem 2 lab 0404 Essay
  • CHEM LAB SCHEDULE Essay
  • Classifying Chem Reactions Lab Essay
  • Chem Lab Notes Essay
  • Chem lab Essay

Become a StudyMode Member

Sign Up - It's Free