Week Two notes (8/31-9/2)
Week Two notes (8/31-9/2) CHE 111
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This 3 page Class Notes was uploaded by Anna Stephens on Friday September 11, 2015. The Class Notes belongs to CHE 111 at State University of New York at Oswego taught by Jeffery A. Schneider (P) in Fall 2015. Since its upload, it has received 94 views. For similar materials see General Chemistry in Chemistry at State University of New York at Oswego.
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Date Created: 09/11/15
Chemistry Week Two 83194 Dr Schneider Signi cant Figures Rules 1L All nonzero numbers are signi cant eg 1121 4 sig gs 2L Zeros between signi cant digits are signi cant eg 305 3 sig gs 3L Leading zeros are signi cant eg 00021 2 sig gs write like 21 x 10393 4L Avoid ambiguity with trailing zeros because zeros after the decimal are signi cant eg 1200 is either 1200 or maybe 1234 Use 12 x 103 or 1200 x 103 Adding and Subtracting Rules 10250 iJLZil 102731 So 102731 is used as the answer because you can only be as precise as the least precise value in addition amp subtraction Multiplication and Division Rules Product or quotient can only have the same amount of signi cant gures as the value with the least amount of signi cant gures eg 14 x 8011 112154 use 11 because we can only two sig gs 115730588 003782529 use 003783 four sig gs An exact value has 00 numbers of sig gs eg 100c 1 doz 12 1 in 254 cm round at the end of computations not throughout Accuracy vs Precision Precise not accurate not precise slightly accurate precise accurate Precise how close measurements are to eachother in experiment Accurate how close measurements are to accepted value Units Units are important or no one will know what you39re talking about Base units are moles meters grams seconds etc 10399 10396 10393 10392 103 106 109 Nano Micro Milli Cen Kilo Mega Giga Chemistry Week Two 83194 Dr Schneider Units Conversions IE a let 1 in 254 cm so 254Cm or 254cm what is on top are the units you 6 Z want to convert to and on the bottom are the units you need to convert from IEZ 254 cm I I eg Z 3048 cm notIce Inches cancel out 12006Z How many yd2 in 1 mi2 1 mi 1760 yd 1 mi2 1760 yd2 1 mi2 30976 x 106 3 22 lyd 278784 x 107 ft2 If we wanted to convert it to feet 30976 x 106yd2 12 22 1ft2 And then inches 278784 x 107 ft2 40144896 x 109in2 notice that there is no need for signi cant gures when deals with exact standard values like feet yards etc Using a series of conversion factors How many km2 in 1 mi2 1263 1ft z z lei 254 cm 6 Z Z Z 1760 yd 3 ft lyd mi2 ZZ lmi