CHEM 105N 1st Edition Lecture 5 Outline of Last Lecture I. Percent as a Conversion FactorII. Parts Per MillionIII. Parts Per BillionIV. Toxicology and Risk-Benefit testsOutline of Current Lecture I. Initial and Final UnitsII. Problem Setup and SolvingIII. ProblemsCurrent LectureI. Initial and Final Units:- The Initial Unit is the unit which is given in the problem- The Final Unit is the unit which you must findEx: A board has a length of 5.0 meters. What is that length in inches?- The initial unit is meters- The final unit is inchesII. Problem Setup and Solving:1. Write out your initial and final units2. Make a unit plan of how you will reach your final units3. Write out conversion factors and equalities which are needed in the process4. Use conversion factors to cancel out the initial unit, leaving the final unitEx: Unit 1 x Unit 2/Unit 1 = Unit 2-The two “Unit 1”(s) canceled each other out, leaving “Unit 2” as the answer- Steps to solving the ProblemIf a rock weighs 164 lb, what is its mass in kilograms?1. Initial: lb (pounds)Final: kg (kilograms)2. Lb Kg (Us Metric conversion)3. 2.20 lb = 1 KgII.20 lb/ 1 Kg OR 1kg/2.20 lb4. SOLVE:(164lb) x (1kg/2.29lb) = 74.5 kgIII. Problems:These 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.How many minutes are in 1.6 days?1. Initial: daysFinal: minutes2. Days minutes 3. 1 day = 24 hours1 hour = 60 minutes(1 day/ 24 hours) OR (24 hours/ 1 day)(1 hour/ 60 Minutes) OR (60 Minutes/ 1 hour)4. SOLVE:(1.6 days) x (24 hours/1 day) x (60 minutes/ 1 hour) = 2.3 x 10^3 min- The days and hours are both canceled out, leaving the final unit minutes- Do not forget to calculate significant figures in the problem to determine how many you may have in your
View Full Document
Unlocking...