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CHM 105 Notes from week 1

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by: Morgan Simpson

CHM 105 Notes from week 1 CHM 103

Marketplace > Tri-County Technical College > Chemistry > CHM 103 > CHM 105 Notes from week 1
Morgan Simpson

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About this Document

these notes will be cover on the first exam.
Chem for Life Sciences
Dr. Powers
Class Notes
25 ?




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1 review
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"What an unbelievable resource! I probably needed course on how to decipher my own handwriting, but not anymore..."
Joyce Koelpin I

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This 5 page Class Notes was uploaded by Morgan Simpson on Thursday January 21, 2016. The Class Notes belongs to CHM 103 at Tri-County Technical College taught by Dr. Powers in Winter 2016. Since its upload, it has received 30 views. For similar materials see Chem for Life Sciences in Chemistry at Tri-County Technical College.

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Star Star Star Star Star

What an unbelievable resource! I probably needed course on how to decipher my own handwriting, but not anymore...

-Joyce Koelpin I


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Date Created: 01/21/16
Chemistry Chapter 1 Outline: Measurements in Science & Medicine: Two types of Measure Systems  English System­ used in the U.S.  Metric System­ used by most of the world for commerce and in the scientific community  It is easier to use that the English system  Base units  o Meter is for length o Gram is for mass o Liter is for volume  o Seconds is for time  o Celsius is for Temperature   SI system­ modern version of the metric system  Stand for international system of measurement  Changes in base units: o Mass is in kilogram instead of gram o Volume is in cubic meter instead of liter   1000 L= 1 cubic meter Prefixes:  Can make the unit larger or smaller   Goes in front of the unit  Definitio Prefix Symbol n kilo- k 103 deci- d -1 10 -2 centi- c 10 milli- m 10-3 micro- μ 10-6 Numbers  Categorized into two groups:  Exact Numbers   Value has no uncertainly. it is a known value   Counting numbers   Definition   Inexact Numbers   Value has uncertainly   Measurement  Uncertain is due the measuring devices used Uncertainty and Significant Figures   Both measurements have digits that are exactly known  The last digit for both of them has to be estimated   Only one estimated digit is recorded  Significant Figures  I. Number of significant figures= all certain digits + one estimated digit. Examples:         2.5= 2 SF’s                  2.55= 3 SF’s  II. Counting the numbers of certain digits   Rules for significant figures  o All non­zero digits are significant  o Zero­come in the three place o  Beginning­ never significant  o Middle­ always significant  o End­ sometimes ( if the number has a decimal in it somewhere, it is significant)  Examples:  0.0260500   Red­ not significant         1500000                                       Black­significant Significant Figures and computations  Rounding Rules  o Digits to the right of decimal to be deleted  o if 4 or less, dropped the following digits o if 5 or higher, round up to the next number and dropped the following digits Examples: 25.7 =26                      23.4= 23 Rules for Multiplication and Division o Count the numbers of significant figures in each number to be multiplied or  divided o The answer with the fewest number of significant figures  Rules for adding and subtracting  o Determine the last significant digit in each number o Add or subtract the numbers  o Round to the largest place value  Examples: (2.35 cm) (11 cm)                            2.35= 3 sf’s    11= 2 sf’s 25.85 cm^2     2.5*10^1 Scientific Notation   Scientific Notation is used to express very larger or small numbers  Method  o Place the decimal between the 1  and 2  nonzero numbers  o Add *10^(­/+) o If the decimal is moving left, it is positive  o If the decimal is moving right, it is negative o Count the number of places the decimal is moved Multiplication and Division  Add exponents if multiply   Subtract if divided  Adding and Subtracting   Before you perform the operation all term must have the same exponent    


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