Organic Chem 1 Lab Midterm

Organic Chem 1 Lab Midterm - Chem 625 Organic Chemistry Lab...

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Chem 625 Organic Chemistry Lab 1 Midterm Examination (Variant A) October 4, 2007 KUID _________________________ Name _________________________ TA name ______________________ You must turn in this test with your scantron sheet. 1. The table below provides some characteristics for three flammable organic solvents. Which solvent is more likely to catch a fire when spilled on a hot plate? Boiling Point, o C Flammable Limits Autoignition Temp. ( o C) Flash Point ( o C) Lower Upper Hexane 68 1.1 7.5 223 -22 Methanol 65 6.7 36.0 385 11 Acetone 56 2.6 12.8 465 -20 A. Acetone, since it has the lowest boiling point B. Methanol, since it has the widest range of flammable limits C. Hexane, since it has the smallest value for the lower flammable limit D. Hexane, since it has the lowest autoignition temperature E. Acetone, since it has the highest autoignition temperature 2. Melting point depression is… A. the effect of lowering the melting point and broadening the melting range when external pressure is applied to the sample B. the effect of lowering the melting point and narrowing the melting range when external pressure is applied to the sample C. the effect of lowering the melting point and broadening the melting range when sample contains impurities D. the effect of lowering the melting point and narrowing the melting range when sample contains impurities E. what students feel when the melting point of a sample does not match literature data
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3. The reason for too wide melting range may be in A. wet or impure sample B. too large sample C. heating the sample too fast D. all A, B, and C are correct E. none of the above 4. Optical rotation is… A. a set of rules that allow for assigning absolute configurations of enantiomers B. a term used to describe the situation when structure of a molecule is not superimposable with its mirror image C. a term used to describe the presence of one or more stereogenic centers D. a phenomenon of rotating the plane of polarized light, when it is passed through
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Organic Chem 1 Lab Midterm - Chem 625 Organic Chemistry Lab...

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