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.
Microsoft Office Excel helps small-business owners analyze price trends, collect demographic data to improve your marketing efforts and produce customized reports for your bank or investors. The foundation of Excel is a workbook. Each Excel workbook is a separate document, within which you create one or several worksheets. 1. Open Excel by clicking All Programs in the Windows âStartâ menu. Scroll through the list of programs to find the Microsoft Office folder and click to open it.