Chemistry 105 Week 2, Part 1 Notes
Chemistry 105 Week 2, Part 1 Notes CH 105- 1E
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This 2 page Class Notes was uploaded by Jazelyn Little on Sunday January 17, 2016. The Class Notes belongs to CH 105- 1E at University of Alabama at Birmingham taught by Steven R. Harville in Spring 2016. Since its upload, it has received 18 views. For similar materials see Introductory Chemistry 1 in Chemistry at University of Alabama at Birmingham.
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Date Created: 01/17/16
2.5 Writing Conversion Factors * Numbers must be written with appropriate units!!* Direct Proportionality Two quantities are proportional if they decrease or increase equally. Minutes Seconds Inches cm mL grams The graph of two quantities includes a line that goes through the origin, point (0,0). Example Conversion Factor Numerator 60 min and 1hr Denominator 1hr 60 min Conversion Factors for a %, ppm, and ppb 8% caffeine is the same as 8 g of caffeine per 100g of solution 8 g caffeine or 100 g solution 100 g solution 8 g caffeine (ppm is parts per million and ppb is parts per billion) 5ppm Chlorine solution = 5 mg Chlorine/ 1 kg solution 4ppb Lead solution = 4 μ Lead / 1 kg solution General Examples 1. The label on a box of sugar reads 25 grams of sugar in 1 bowl 25 g sugar or 1 bowl 1 bowl 25 g sugar 2. The nitrate level in well water is 32 ppm 32 mg nitrate or kg solution kg solution 32 mg nitrate 3. 1 deciliter contains 100 ml 1 dL or 100 ml 100 ml 1 dL **** This is an EXACT measurement**** 2.6 Problem Solving Using Unit Conversions Example: How many quarters are in $537.00?t from unit to unit Given Know Wanted $537.00 4 quarters quarters 1 dollar $537.00 x (4quarte)s= 2148 quarters $100 There is no uncertainty, so significant figures do NOT count! This is for you to try! I will get you started and you will just fill in the question marks! Example 1: How many seconds are in the month of January? Given Wanted 31 days seconds (31 days) 24hours ? ? = 2,678,400 seconds ( 1day )? ?) Ex6.0 furlongs at 30.7 miles per hour? There are 40 rods in one furlong, 5.5 yards in one rod, 3 feet in one yard, and 5,280 feet per mile. Given Wanted 6 furlongs seconds 40rods5.5yards3− ft 1mile 1hour 6 furlongs (1 furlong1rod)(1yard 5280 ft 30.7miles = 87.94788 seconds =88 seconds
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