Chem 121 1st Edition Lecture 5 Outline of Last Lecture I. MeasurementII. Units of Measurements III. Density IV. Energy V. Law of Conservation of Energy VI. Solving Chemical Problems (Unit Analysis/ Dimensional Analysis)Outline of Current Lecture II. Ratio Statements as Conversion FactorsIII. Problem Solving StrategiesCurrent LectureRatio Statements as Conversion Factors- Need good understanding to find the hidden stuff in the problem- Need to recognize 2 different units in division form- There are 3 types of ratio statements (2 different units, 2 different entities, or 2 different units and entities)- Convert ratio statements to equation form; take your time!!- Gives extra information to help build a solution map- Helps understand the relationship between numbers and units/entities- The portion of the solution map between units/entities is setProblem Solving Strategies1) Track unit/entity from known to unknown as a guide. Number and Unit, unit is more important**2) Search for 2 units/entities and put them into equation form. Find relations between them3) Write down desired unit/entity asked in original questionThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.**4) Prepare a solution map to convert given unit/entity to desired unit/entityA. Organize and sort units/entities by dimensions, convert to same systemB. One unit/entity at a timeC. One arrow= one conversionD. When powering, power everything**5) Set up calculation only with unit/ entity6) Put numbers in appropriate positions, and calculate. ALWAYS keep number AND unit
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