Chap._1_Problem_Solving_and_Dimensional_Analysis

# Chap._1_Problem_Solving_and_Dimensional_Analysis - Chapter...

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Chapter 1 Matter, Measurement, and Problem Solving Chemistry: A Molecular Approach , 1 st Ed. Nivaldo Tro 2008, Prentice Hall Roy Kennedy Massachusetts Bay Community College Wellesley Hills, MA

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Solving Chemical Problems Equations & Dimensional Analysis
Tro, Chemistry: A Molecular Approach 3 Units Always write every number with its associated unit Always include units in your calculations you can do the same kind of operations on units as you can with numbers cm × cm = cm 2 cm + cm = cm cm ÷ cm = 1 using units as a guide to problem solving is called dimensional analysis

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Tro, Chemistry: A Molecular Approach 4 Problem Solving and Dimensional Analysis Many problems in chemistry involve using relationships to convert one unit of measurement to another Conversion factors are relationships between two units May be exact or measured Conversion factors generated from equivalence statements e.g., 1 inch = 2.54 cm can give or in 1 cm 54 . 2 cm 54 . 2 in 1
Tro, Chemistry: A Molecular Approach 5 Problem Solving and Dimensional Analysis Arrange conversion factors so given unit cancels Arrange conversion factor so given unit is on the bottom of the conversion factor May string conversion factors So we do not need to know every relationship, as long as we can find something else the given and desired units are related to unit desired unit given unit desired unit given = ×

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Tro, Chemistry: A Molecular Approach 6 Conceptual Plan a conceptual plan is a visual outline that shows the strategic route required to solve a problem for unit conversion, the conceptual plan focuses on units and how to convert one to another for problems that require equations, the conceptual plan focuses on solving the equation to find an unknown value
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## This note was uploaded on 02/19/2009 for the course CHEM 101 taught by Professor Rillings during the Spring '06 term at Clemson.

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Chap._1_Problem_Solving_and_Dimensional_Analysis - Chapter...

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