Pre-lab quiz for chem 243b Essay

7461 WordsOct 28, 201430 Pages
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…show more content…
Question options: View FeedbackQuestion 4 1 / 1 point Which of the following compounds would be able to react as the dienophile in a classical Diels-Alder reaction? Question options: View FeedbackQuestion 5 1 / 1 point Indicate which of the following pairs of reagents will participate in a classical Diels-Alder reaction. Question options: and and and and Question 6 1 / 1 point Select the correct product for each of the pairs of reagents given. __5__ __4__ __1__ __3__ 1. 2. 3. 4. 5. Attempt Score: 6 / 6 (100.00 %) Overall Grade (highest attempt): 6 / 6 (100.00 %) Quiz #2 DA Submission View Your quiz has been submitted successfully. Question 1 1 / 1 point In the procedure of the Diels-Alder reaction you will perform, the first step will be to weigh out maleic anhydride. You will then have to calculate how much 2,3-dimethylbutadiene you will need. Assuming you weigh out 176 mg of maleic anhydride, how many moles does that correspond to? (Use five digits after the decimal point) (assume C = 12.0, H = 1.0, O = 16.0) Answer: 0.00179 Question 2 1 / 1 point In this Diels-Alder reaction you will be using equivalent amounts of maleic anhydride and 2,3-dimethylbutadiene. You weighed out 182 mg of maleic anhydride. Which volume of 2,3-dimethylbutadiene will you need to add? The answer should be in mL with three digits after the decimal point. Answer: 0.209

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