CHEM 219 Module 3 Exam Questions with Correct Answers Latest Update 2025-2026
Stereochemistry - Answers Analysis of 3D structures of organic molecules
Stereoisomers - Answers Same MF and connectivity, different 3D arrangements of
atoms/groups
Chirality - Answers Handedness
Test for chirality - Answers Superimposability, chiral objects cannot be superimposed on mirror
image
Enantiomers - Answers The different forms of chiral compounds-non-superimposable mirror
images of each other
Chiral vs achiral - Answers Chiral objects cannot be superimposed on their mirror image
Achiral objects can be superimposed on their mirror images
Stereocenter - Answers Carbon atom w/ tetrahedral geometry bound to 4 different
atoms/groups, the cause of chirality/twist
What creates handedness - Answers The twist from stereocenter
Which atoms cannot be stereocenters - Answers Carbons w/ multiple hydrogens ex CH2,CH4
Carbons w/ multiple bonds (violates tetrahedral)
Racemic - Answers Equal amounts of both enantiomers
Carvone - Answers An enantiomer pair, one smells like spearmint the other smells like caraway
seed
Physical properties of enantiomers and their ease of separation - Answers Similar properties,
hard to separate
Polarimeter - Answers Determines the prescense of enantiomers
Under controlled conditions can get specific rotation
R/S - Answers R=clockwise
S=counterclockwise
wedge notation - Answers represents stereocenters
Maximum number of stereoisomers possible - Answers 2^n
Formula for pairs of enantiomers - Answers (2^n)/2
Stereochemistry - Answers Analysis of 3D structures of organic molecules
Stereoisomers - Answers Same MF and connectivity, different 3D arrangements of
atoms/groups
Chirality - Answers Handedness
Test for chirality - Answers Superimposability, chiral objects cannot be superimposed on mirror
image
Enantiomers - Answers The different forms of chiral compounds-non-superimposable mirror
images of each other
Chiral vs achiral - Answers Chiral objects cannot be superimposed on their mirror image
Achiral objects can be superimposed on their mirror images
Stereocenter - Answers Carbon atom w/ tetrahedral geometry bound to 4 different
atoms/groups, the cause of chirality/twist
What creates handedness - Answers The twist from stereocenter
Which atoms cannot be stereocenters - Answers Carbons w/ multiple hydrogens ex CH2,CH4
Carbons w/ multiple bonds (violates tetrahedral)
Racemic - Answers Equal amounts of both enantiomers
Carvone - Answers An enantiomer pair, one smells like spearmint the other smells like caraway
seed
Physical properties of enantiomers and their ease of separation - Answers Similar properties,
hard to separate
Polarimeter - Answers Determines the prescense of enantiomers
Under controlled conditions can get specific rotation
R/S - Answers R=clockwise
S=counterclockwise
wedge notation - Answers represents stereocenters
Maximum number of stereoisomers possible - Answers 2^n
Formula for pairs of enantiomers - Answers (2^n)/2
