CHEM 1120 Exam 1 Highlights – Key Concepts & Complete Review
Guide (2026)
Linear - ANS ✔✔2 Bonds, 0 lone pairs; 180 degree bond angle
Trigonal Planar - ANS ✔✔3 Bonds, 0 lone pairs; 120 degree bond angle
Bent(3CC) - ANS ✔✔2 bonds, 1 lone pair; ideal bond angle of 120
Tetrahedral - ANS ✔✔4 bonds, 0 lone pairs; 109.5 bond angle
Trigonal Pyramidal - ANS ✔✔3 Bonds, 1 lone pair; 107.3 bond angle
Bent (4 CC) - ANS ✔✔2 Bonds, 2 lone pairs; 104.5 bond angle
Trigonal Bipyramidal - ANS ✔✔5 bonds, 0 lone pairs; 90 degree side view bond angle, 120
degree top view bond angle
Seesaw - ANS ✔✔4 Bonds, 1 lone pair; 90 degree ideal bond angle
T-shaped - ANS ✔✔3 bonds, 2 lone pairs; 90 degree ideal bond angle
Linear (3 lone pairs) - ANS ✔✔2 bonds, 3 lone pairs; 180 degree bond angle
Octahedral - ANS ✔✔6 bonds, 0 lone pairs; 90 degree bond angles
, Square Pyramidal - ANS ✔✔5 bonds, 1 lone pair; 90 degree ideal bond angles
Square Planar - ANS ✔✔4 bonds, 2 lone pairs; 90 degree ideal bond angles
Alcohol - ANS ✔✔an organic compound who's molecular structure includes a hydroxyl group
bonded to a carbon atom that is not bonded to any other functional groups
ether - ANS ✔✔an organic compound that contains an oxygen atom with single bonds to two
carbon atoms
ketone - ANS ✔✔An organic compound that contains a carbonyl group with the C bonded to
two other carbon atoms
ion-dipole interactions - ANS ✔✔Coulombic attractions between ions (either positive or
negative) and polar molecules(with a permanent dipole)
constitutional Isomer - ANS ✔✔One of a set of compounds with the same molecular formula
but different connections between the atoms in their molecules
alkane - ANS ✔✔hydrocarbon in which each carbon atoms bonded to four other carbon or
hydrogen atoms
Viscosity - ANS ✔✔a measure of a fluid's resistance to flow
hydrocarbon - ANS ✔✔an organic compound whose molecules contain only carbon and
hydrogen atoms
Guide (2026)
Linear - ANS ✔✔2 Bonds, 0 lone pairs; 180 degree bond angle
Trigonal Planar - ANS ✔✔3 Bonds, 0 lone pairs; 120 degree bond angle
Bent(3CC) - ANS ✔✔2 bonds, 1 lone pair; ideal bond angle of 120
Tetrahedral - ANS ✔✔4 bonds, 0 lone pairs; 109.5 bond angle
Trigonal Pyramidal - ANS ✔✔3 Bonds, 1 lone pair; 107.3 bond angle
Bent (4 CC) - ANS ✔✔2 Bonds, 2 lone pairs; 104.5 bond angle
Trigonal Bipyramidal - ANS ✔✔5 bonds, 0 lone pairs; 90 degree side view bond angle, 120
degree top view bond angle
Seesaw - ANS ✔✔4 Bonds, 1 lone pair; 90 degree ideal bond angle
T-shaped - ANS ✔✔3 bonds, 2 lone pairs; 90 degree ideal bond angle
Linear (3 lone pairs) - ANS ✔✔2 bonds, 3 lone pairs; 180 degree bond angle
Octahedral - ANS ✔✔6 bonds, 0 lone pairs; 90 degree bond angles
, Square Pyramidal - ANS ✔✔5 bonds, 1 lone pair; 90 degree ideal bond angles
Square Planar - ANS ✔✔4 bonds, 2 lone pairs; 90 degree ideal bond angles
Alcohol - ANS ✔✔an organic compound who's molecular structure includes a hydroxyl group
bonded to a carbon atom that is not bonded to any other functional groups
ether - ANS ✔✔an organic compound that contains an oxygen atom with single bonds to two
carbon atoms
ketone - ANS ✔✔An organic compound that contains a carbonyl group with the C bonded to
two other carbon atoms
ion-dipole interactions - ANS ✔✔Coulombic attractions between ions (either positive or
negative) and polar molecules(with a permanent dipole)
constitutional Isomer - ANS ✔✔One of a set of compounds with the same molecular formula
but different connections between the atoms in their molecules
alkane - ANS ✔✔hydrocarbon in which each carbon atoms bonded to four other carbon or
hydrogen atoms
Viscosity - ANS ✔✔a measure of a fluid's resistance to flow
hydrocarbon - ANS ✔✔an organic compound whose molecules contain only carbon and
hydrogen atoms
