Organichemica
Basic Organic Chemistry

A Tutorial

Dave Woodcock ©2001
Okanagan University College

OUC Home Page Chem Home Page
Level 1

Glossary

L

Main Index
Glossary Index


linear

In a straight line; a bond angle of 180°


ethyne is a linear molecule containing two
sp hybridized carbons.

linear combination of atomic orbitals

A mathmatical method whereby atomic orbitals are mixed together to give molecular orbitals. As with hybridization, the number of molecular orbitals produced equals the number of atomic orbitals used. For example, mixing together the two 1s orbitals of two different H atoms (with the contribution from each of the two orbitals varying with distance along the bond) leads to two molecular orbitals, one with lower, the other with higher energy than the original hydrogen 1s orbitals. Electrons in the lower energy molecular orbital require input of energy to move them into the 1s atomic orbitals, and without this added energy cannot move. They are stable and the molecular orbital is a bonding mo. Electrons in the higher energy molecular orbital can drop into the lower energy 1s atomic orbitals spontaneously, the higher mo is destabilizing and is called an anti-bonding mo (anti = against).

Lewis acid/base

A compound which accepts a pair of electrons to form a bond. The compound donating the electron pair is the Lewis base.

London forces

Attractive forces between molecules due to the formation of instantaneous dipoles when nuclear and electronic charge centres do not coincide due to the independent movement of nuclei and electrons

lone pair

Two electrons, in an atoms outer electron shell (layer), not involved in bonding.
A lone pair of electrons is required for an electron rich (nucleophilic) centre in a reaction.

Glossary Index
A B C D E F G H I J K L M
N O P Q R S T U V W X Y Z

Main Index

page upkeep: Dave.
I would appreciate comments and additions by email to:
woodcock@okanagan.bc.ca
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