Lab 13: Formation of Cyclohexene from Cyclohexanol Flashcards
What should you do if a chemical gets in the eye
use the eyewash fountain, then notify the instructor
when performing a simple distillation on a mixture of two liquids, A (bp 123C) and B (bp 185C), why should a boiling water bath not be used as the heat source?
The low boiling point of water will result in a very slow and incomplete distillation process.
What is the last function you should perform before leaving the lab?
Wash your hands
When using dichloromethane as a solvent, which would make a good, yet cost effective, drying agent?
calcium sulfate
In the technique of washing a liquid, as a general rule, the total volume of the wash liquid should be…
about the same volume as the liquid being washed
What is the advantage of calculating free energy changes rather than entropy changes to determine reaction spontaneity?
Reaction spontaneity may be predicted from the value of only one variable rather than two variables
The physical law which states that the partial pressure of a volatile gas is equal to its mole fraction times the equilibrium vapor pressure of the pure solvent is…
Raoult’s law
what is a key idea in the understanding of distillation?
the vapor over any mixture of volatile liquids contains more of the lower boiling component than does the liquid mixture itself
What might be the consequence of not adding boiling chips during the distillation?
The mixture may “burp” when heated
What is the purpose of using anhydrous sodium sulfate in this experiment?
It removes excess water from the solution
What is the purpose of redistilling the organic layer?
to further purify the product
Why should the phosphoric acid be added dropwise?
the process is exothermic; the solution should be kept cool at this stage
In the reaction of tert-butyl bromide with boiling ethanol, which substance would be the likely E1 product?
2-methylpropene
Predict the two most likely mechanisms which occur when 2-iodohexane is heated in ethanol
E1 and SN1
Order these compounds of increasing reactivity in an SN1 reaction
CH3Br CH3CH2CH2I C(CH2)3Cl CH3CHBrCH3 CH3CHICH3
CH3Br CH3CH2CH2I CH3CHBrCH3 CH3CHICH3 C(CH3)3Cl
