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.
Apple was established on April 1, 1976, by Steve Jobs, Steve Wozniak and Ronald Wayne to sell the Apple I personal computer kit. The Apple I kits were computers single handedly designed and hand-built by Wozniak and first shown to the public at the Homebrew Computer Club.uring his keynote speech at the Macworld Expo on January 9, 2007, Jobs announced that Apple Computer, Inc. would from that point on be known as Apple Inc., because the company had shifted its emphasis from computers to mobile electronic devices. This event also saw the announcement of the iPhone and the Apple TV.