Lewis Acid-Base Concept. The Lewis theory classifies a substance as an acid if it acts as an electron-pair acceptor and as a base if it acts as an electron-pair donor. Other ways of classifying substances as acids or bases are the Arrhenius concept and the Bronsted-Lowry concept.ewis Acid-Base Concept. The Lewis theory classifies a substance as an acid if it acts as an electron-pair acceptor and as a base if it acts as an electron-pair donor. Other ways of classifying substances as acids or bases are the Arrhenius concept and the Bronsted-Lowry concept.
Microsoft Excel was created by Microsoft Corporation. It was first released in 1985.
(Woz for Hewlett-Packard, Jobs for Atari) Wozniak had been dabbling in computer-design for some time when, in 1976, he designed what would become the Apple I. Jobs, who had an eye for the future, insisted that he and Wozniak try to sell the machine, and on April 1, 1976, Apple Computer was born. Hobbyists did not take the Apple I very seriously, and Apple did not begin to take off until 1977, when the Apple II debuted at a local computer trade show. The first personal computer to come in a plastic case and include color graphics, the Apple II was an impressive machine.