# Lesson2 - Chem 110 Spring 2008 Citrus Community College T...

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Chem. 110 Spring 2008 Citrus Community College T. Miles Lesson II: Dimensional Analysis and Density (Ch. 2) Lesson II : Dimensional Analysis and Density (Ch. 2) Objectives: Learn to use dimensional analysis to solve problems Discuss density and density calculations IV.) Dimensional Analysis A.) Equalities: mathematical statement, equating two quantities expressed in different units. (e.g. 1 dozen eggs = 12 eggs). B.) Conversion Factors: ratio of two equivalent quantities. (e.g. ). Why are we allowed to just do this? Algebra!!! and . For the most part, unit factors represent exact relationships . (1) They do not affect S.F.’s when used in calculations. (2) They must be written down to the correct number of S.F.’s. Examples : Write a unit equation and two unit factors for each of the following statements: (1) one pound (lb.) is 16 ounces (oz.). (2) there are 5280 feet (ft.) in one mile (mi.). C.) Problem Solving using Dimensional Analysis **This is the most important tool that you will need to learn in this class!!!!

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• Fall '07
• MILES

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