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20171208210832final Exam Study Guide 1

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Chem 300 Final Exam Study Guide Fall 2017 Multiple Choice (should take 30s or less to answer) Significant figures (ex. Round to 5 significant figures) Rules of significant figures: There are three rules on determining how many significant figures are in a number: 1. Non-zero digits are always significant. 2. Any zeros between two significant digits are significant. 3. A final zero or trailing zeros in the decimal portion ONLY are significant. Significant figures calculations (adding/subtracting/multiplying/dividing) For addition and subtraction, look at the decimal portion (i.e., to the right of the decimal point) of the numbers ONLY. Here is what to do 1) Count the number of significant figures in the decimal portion of each number in the problem. (The digits to the left of the decimal place are not used to determine the number of decimal places in the final answer.) 2) Add or subtract in the normal fashion. 3) Round the answer to the LEAST number of places in the decimal portion of any number in the problem. The following rule applies for multiplication and division The LEAST number of significant figures in any number of the problem determines the number of significant figures in the answer. This means you MUST know how to recognize significant figures in order to use this rule. Scientific notation As an example, let us take 5.14 × 105 = 514000.0 Scientific notation consists of a coefficient (here 5.14) multiplied by 10 raised to an exponent (here 5). To convert to a re ...
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