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# Memorize Test1 Chem 1201 Fall 2011 1

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Louisiana State University

Chemistry

CHEM 1201

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Chem 1201 Memorize for Test 1 Page 1 Revised 9611 Significant FiguresAlways go from left to rightStartStop when you run out of numbersWith a Decimal 000100300 has 6 sig figsNo Decimal000100300 has 4 sig figsStart Stop with last number that isnt zero MultiplicationDivisionUse the lowest number of sig figs 2 314159 x 5492answer has 2 sig figshas 2 sig figsAdditionSubtractionAnswer cannot go past lowest place holder0244433710001 0003 104468010447Answer cannot go past the first decimal place due to 10001Webassign usually needs 3 sig figsFor exampleIf the answer is 00602 then entering the answer is 006 will be counted wrong A blue 40 in front of the answer box means that you have to pay attention to sig figs You may have to add a decimal to the end of your answer in order to get the correct number of sig figsabadbccd Chem 1201 Memorize for Test 1 Page 2 Revised 9611 Metric Prefixes1E10 m1 AngstromQuick Conversion Tricks1Replace the symbol for what it stands for1Replace the symbol for what it stands for 2 1 kg42 mg 21 E3 g42E3 g2The combination of a prefix and its inverse 1and its inverse 1236mcm11010mkm110mm110Ex Thus whenever you need to add a prefix write its inverse in front of itThus whenever you need to add a prefix write its inverse in front of it This is equivalent to multiplying by 1 and thus This is equivalent to multiplying by 1 and thus successfully changes to the new prefixsuccessfully changes to the new prefixg2g5mgE32gE653If the exponent part goes down the coefficient part becomes larger3If the exponent part goes down the coefficient part becomes larger477 E7 m 477 E5 m477 E9 m00477 E3 m477 nm00477 mm331 L1000 mL1000 cm1 cm1 mL 633There are 10 cm1 m

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