Chem 120 Week 2 notes
Chem 120 Week 2 notes CHEM 120
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This 3 page Class Notes was uploaded by Leslie Pike on Sunday September 6, 2015. The Class Notes belongs to CHEM 120 at Western Kentucky University taught by Dr. Darwin Dahl in Summer 2015. Since its upload, it has received 144 views. For similar materials see College Chemistry I in Chemistry at Western Kentucky University.
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Date Created: 09/06/15
SUM MAR Impo rtant infor mati Chem 120 notes Week 2 Monday Signi cant Figures and rounding There are two different types of numbers ratios and measurements A ratio would be 60 minutes per hour or 5280 feet per mile These numbers are EXACT values and they are considered to have an in nite number of signi cant gures Measurements would be an iron ingot which weighs 352 grams This number is NOT exact because a less sensitive scale may read 4 grams and a more sensitive one 3523681 grams These numbers do NOT have an in nite number of signi cant gures These numbers are usually written in scienti c notation and the number of digits is considered the number of signi cant gures Ex 2331039l4 has 3 signi cant gures 60221023 has four signi cant gures When doing multiplication and division problems round your answer to the same number of signi cant gures that are in the number with the fewest number of signi cant gures When doing addition and subtraction problems round to however many decimal places in the number with the fewest decimal places HOW TO ROUND in these cases we are rounding to 1 decimal place 0 Less than 5 round down 542 rounds to 54 76327 rounds to 76 0 Greater than 5 round up 557 rounds to 56 3285 rounds to 33 0 Equal to ve round down if number to the left is even and round up if number to the left is odd 365 rounds DOWN to 36 335 rounds UP to 34 Wednesday unit conversions Dr Dahl started the lecture by making a lot of bad chemistry jokes Apparently all of the good ones Argon Anyway down to business UNIT CONVERSIONS TO MEMORIZE 100 pounds 454 grams 0 100 quarts 946 mL approximately 1 L but 1qt1L is usually not precise enough 0 100 cubic centimeters 100 mL this is an EXACT relationship 0 1 mile 1609 kilometers this will save you lots of arithmetic and paper spaceD 1 Angstrom 103910 meters Remainder of lecture was spent working unit conversion problems Unit conversions are very straightforward divide by the unit you are getting rid of and multiply by the new unit Watch out for quotstupid mistakesquot such as saying that 454 pounds 1 gram because 454 grams 1 pound Be sure not to get the two ipped Also when converting squared or cubic units square or cube the number you multiply by To convert 372 cubic inches to cubic centimeters multiply by 2543 Friday Entire class period spent working unit conversion problems Class was instructed to see Dr Dahl in his of ce and ask for help if they still have issues with unit conversion
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