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This 2 page Class Notes was uploaded by Kara Nichols on Wednesday May 25, 2016. The Class Notes belongs to CHM 111 at Calhoun Community College taught by Mona Chaudhary in Spring 2016. Since its upload, it has received 24 views.
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Date Created: 05/25/16
College Chemistry 1 – Mona Chaudhary 5/23/2016 Important Words or Important People Important Concepts Definitions Lesson 2 Measurements and Units English & Metric oz, lb, ton Gram, Kg, mg in, ft, yd, mile cm, meter, Km pint, quart, gallon Liter, mL Significant Figures o Non zero digits 38.56 (4) 288 (3) o Zeros at the beginning of a number is not significant and are considered place holders 0.052 (2) 0.00321 (3) o Zeros between non zeros are significant 2007 (4) 302 (3) o Zero at the end of a decimal number are significant 38.0 (3) o Zero at the end of a non-decimal number are ambiguous 24,300 (3, because there are no units) 24,300 Km (5, because there is a unit) o A decimal at the end of the number makes zeros significant 280. (3) 2. Ft (1) Rounding o < 5, leave it 6.474 = 6.47 o > 5, round up 6.5483 = 6.55 o = 5, round up 6.575 = 6.58 Dimensional analysis o Converting from one unit to another using factors o How many inches are in 3.2 miles? (5280 ft = 1 mile) Significant figures are based on the least amount of sig. figs. in the question. In this case, there are 3 3.2 Miles 5280 ft 12 inches 20,2752 inches 5 X 1 Mile X 1 ft = 2.03 x 10 inches X Density o D = M/V o V = M/D o M = VD Temperature o Fahrenheit - °F (1.8C)+32 o Celsius - °C (F-32)/1.8 o Kelvin - K C+273
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