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UCCS / Chemistry / CHEM 3101 / How do i find the axis of symmetry of a parabola?

How do i find the axis of symmetry of a parabola?

How do i find the axis of symmetry of a parabola?

Description

School: University of Colorado Colorado Springs
Department: Chemistry
Course: Organic Chemistry I
Professor: John balyeat
Term: Winter 2016
Tags: Organic Chemistry
Cost: 50
Name: Ch 5 Review and Study guide
Description: Stereoisomers
Uploaded: 02/23/2016
2 Pages 45 Views 1 Unlocks
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Ch 5 Review


How do i find the axis of symmetry of a parabola?



5.1  

Constitutional Isomers differ in their connectivity of atoms but have the same  molecular formula.

Stereoisomers have the same connectivity of atoms but differ in their spatial  arrangement. Cis and trans are used to differentiate stereo isomeric alkenes as well  as disubstituted cycloalkanes

5.2

Chiral objects are not superimposable on their mirror images

The most common source of molecular Chirality is the presence of a chirality  center, a carbon atom bearing four different groups

A compound with one chirality center will have one non-superimposable mirror  image called its enantiomer .

5.3

The Cahn-Ingold-Prelog system is used to assign the configuration of a chirality  center. The four groups are each assigned a priority, based on atomic number, and  the molecule is then rotated into perspective in which the fourth priority is on a  dash. A clockwise sequence is designated as R, while a counterclockwise sequence  is designated as S


What is the difference between an enantiomer and a diastereomer?



5.4

A Polarimeter is a device used to measure the ability of chiral organic compounds  to rotate the plane of plane polarized light. Such compounds are said to be  optically active. Compounds that don’t rotate plane polarized light are optically  inactive. Don't forget about the age old question of What is the postmodern theory?

Enantiomers rotate plane polarized light in equal amounts but in opposite  directions. The specific rotation of a substance is a physical property. It’s  determined experimentally by measuring the observed rotation and dividing by  the concentration of the solution and the path length.

Compounds exhibiting a positive rotation (+) are said to be dextrorotatory, while  compounds exhibition a negative rotation (-) are said to be levorotatory.


What is plane polarized light in organic chemistry?



A solution containing a single enantiomer is optically pure while a solution  containing equal amounts of enantiomers is called a racemic mixture.  

5.5

For A compound with multiple chirality centers, a family of stereoisomers exists.  Each stereoisomer will have at most one enantiomer with the remaining members  of the family being diastereomers.  If you want to learn more check out What is an example of a conditioned response?

The number of stereoisomers of a compound can be no larger than 2^n, where n=  the number of chirality centers.  

Enantiomers are mirror images, Diastereomers are not.  

5.6

There are 2 kinds of symmetry: Rotational and reflectional

The presence or absence of an axis of symmetry is irrelevant. A compound that possesses a plane of symmetry will be archiral.

A compound that lacks a plane of symmetry will most likely be chiral (although  there are exceptions which can be ignored for now)

A Meso compound contains multiple chirality centers but is nevertheless achiral  because it possesses reflectional symmetry. A Family of stereoisomers containing a  meso compound will have fewer than 2^n stereoisomers

5.7

Fischer Projections are drawings that convey the configurations of Chirality centers,  without the use of wedges and dashes. All horizontal lines are understood to be  coming out of the page, and all vertical lines are understood to be going into the  page.  We also discuss several other topics like How would one know if a molecule has london dispersion forces?
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5.8

Some compounds such as butane and (cis)-1, 2-dimethylcyclohexane can adopt  enantiomeric conformations. These compounds are optically inactive because the  enantiomeric conformations are in equilibrium.

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