Chemistry 105 Week 1 Notes
Chemistry 105 Week 1 Notes CH 105- 1E
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This 2 page Class Notes was uploaded by Jazelyn Little on Thursday January 14, 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 43 views. For similar materials see Introductory Chemistry 1 in Chemistry at University of Alabama at Birmingham.
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Date Created: 01/14/16
Friday, January 15, 2016 Exact Numbers Significant Figures (Sig Figs) do NOT count when dealing with exact numbers. No uncertainty; infinitely significant Counting numbers are exact Section 2.3: Significant figures in Calculations Rule to follow: The term with the least amount of Sig. Figs. is the number you report. Is that confusing? Here is another way to think of it…. If you are dealing with two numbers, one has 4 sig figs and the other has 3, you would only use 3 numbers in your answer! This will require you to round. Rounding Examples 1. 42.1 -> 42 2. 88.67 -> 89 WHEN YOU ARE DEALING WITH…… Multiplication and Division The fewest # of sig figs determines what gets reported. Addition and Subtraction The number with the fewest decimal places determines the answer reported Example = 65.09 + 3.0 62.09 but 62.01 would but the reported answer due to the decimal places Practice Problems 1. 0.02050 g = 89.1304….. g/ml = 89.1 g/ml 0.000230 ml 2 2. 28.58 g = 0.222724438 g/ml = 0.22 g/ml (16g)(8.02ml) Try this one on your own! (I’ll give you the answer afterwards) 3. 75.29 g – 44.2899 g 5.05 ml Answer to # 3 75.29g – 44.2899g = 31.0001g = 31.00g = 6.16 g/ml 5.05 ml 5.05 ml 5.05 ml Prefixes Milli and micro make smaller units Examples: milligram (mg) microgram (mcg) 2.4 Prefixes and Equalities (There is a table in the textbook that gives all of the prefixes, but I will provide a few for these notes) Prefix Symbol Numerical Scientific Equality Value notation 6 6 mega M 1 000 000 10 1 Mg= 1 x 10 g kilo k 1 000 103 1km = 1 x 103 m −1 −1 deci d 0.1 10 1dL = 1 x 10 L centi c 0.01 10−2 1cm = 1 x 10−2 m milli m 0.001 −3 −3 10 1 ms = 1 x 10 s MORE TO THINK ABOUT…. 1000 mg = 1 g 1000 meters = 1 kilometer (km) 1x −3 g = 1 mg 10 0.01m = 1 cm A meter is the measure of the speed of light Important conversion to remember: 1 cc = 1 cm3 =1 mL
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