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Chapter 1 Week 1

by: Cecilia Capeles

Chapter 1 Week 1 CHEM 1120

Cecilia Capeles

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About this Document

These notes cover his lecture, done out examples of what we are learning, as well as key points from his power points.
Intro to Chem for AH Science
James Collins
Class Notes
General Chemistry
25 ?




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This 3 page Class Notes was uploaded by Cecilia Capeles on Friday September 30, 2016. The Class Notes belongs to CHEM 1120 at East Carolina University taught by James Collins in Fall 2016. Since its upload, it has received 22 views.


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Date Created: 09/30/16
Express a very large or small measurement in scientific notation ● Every measurement has two components ○ Numerical value ○ Unit ● For large numbers do scientific notation(between 1 and 9.999999999 * 10^ X) ○ negative=small number ○ positive= large number ● Learn metric prefixes, the symbol, and the power of 10 associated with the unit of measurement in table 1.6 in the textbook page 17 (USE NOTECARDS TO LEARN) Express a measurement to the proper number of significant digits ● When measuring record what you know for certain and then estimate one digit  after  ● The last digit on a digital balance is assumed to be estimated (uncertain digit) NO TITLE ● Decimal places are the number of digits to the RIGHT of a decimal point ○ 4.1 has one decimal places ○ .0005 has four decimal places ● Significant digits are significant enough to report in a measurement  ○ Certain digits ○ The ONE uncertain digit ● ZERO’s  ○ Leading zeros: located at the beginning of the decimal are   NEVER significant ○ Confined zeros: located between nonzero digits are ALWAYS  SIGNIFICANT ○ Trailing zeros: located at the end of a number ARE SIGNIFICANT  ONLY if the number has an explicitly shown decimal point ● LOOK AT POWER POINT FOR ADDING,SUBTRACTING, MULTIPLYING, &  DIVIDING CHART Exact Numbers and Inexact Numbers ● Inexact numbers: have to do with measurements and are uncertain ● Exact numbers: come from counting or come from a definition ○ Have an unlimited number of sig figs Interconverting Between Units ● When adding or subtracting, units don’t change ○ You can’t add unlike units ● When dividing, units may get cancelled out ● When converting one unit to another… ○ Given Unit x (conversion factor) = Desired Unit ● Table 1.5 on page 16 of textbook (some SI and metric units and their  equivalents) ● Page 18… there's a table ● Page 19…there’s a table Steps for interconverting among units 1. Assess units and outline a strategy to cancel the given units and make desired  units appear. 2. Determine relationships for each step in the strategy above. 3. Fill in the conversion factors such that the given unit cancels with one of the units in the conversion factor ratios and the other unit of the ratio remains unchanged. 4. Finish problem. Units tell you whether or not to multiply or divide. Everything  above line gets multiplied and everything below the line gets divided. Example 1: 1. Strategy: kg to g 2. Relationships: 1 kg = 10^3 g 3. Setup:  3     x 10 g = 3 x 10^3 grams 1kg Example 2: 1. Strategy: pm (­­­>) m 2. Relationships: 1pm = 10^­12 m 3. Setup:  7  p   x 10^­ m = 7 x 10^­12 1pm Example 3: 1. Strategy: microsecond(­­­>) second (­­­>) giga second 2. Relationships: 1 microsecond = 10^­6 seconds & 1 giga second= 10^9 seconds 3. Setup: 3.2 microseconds x  10^­6   seconds    x  giga secon  = 3.2 x 10^­15 1 microsecond x (1 x 10^9 seconds) Example 4: 1. Strategy: miles(­­­>) ft(­­­>) inches 2. Relationships: 1 mile = 5280ft 3. Setup: 


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