Chapter 1 Notes

# Vi significant figures in a measurement relate to

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VI. Significant Figures in a measurement relate to accuracy and are generally indicated by using scientific notation. A. Example: 1. .003 g has 1 significant figure indicated by 3 × 10 4 . 2. 7,340 g has at least 3 significant figures indicated by 7.34 × 10 3 g. B. In this course, observe the rules for significant figures. mL 3 g 10 = 3.3333, etc ., on a calculator. The answer is 3. VII. Using Units in Calculations: Dimensional Analysis. A. The fundamental measurement units are: length = meter electric current = ampere mass = kilogram luminous intensity = Candela time = seconds temperature = Kelvin amount = mole B. Chemistry, physics, biology often require conversion between or among metric units and conversion between or among metric and English units. 1. Convert 3.21 km to cm. 1 km = 1000 m; 1 m = 100 cm 3.21 km × km m 1000 × m cm 100 = 3.21 × 10 5 cm 3

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Chapter 1 Notes-Chemistry and Measurement Fall 2101 Ebbing and Gammon 9 th Edition Chem 0110 2. Note: Conversion factors are defined as exact and do not have an impact on significant figures in an answer. 3. Convert 3.21 km to inches. 2.54 cm = 1 inch 3.21 × 10 5 cm × cm 54 2 inch 1 . = 1.26 × 10 5 inches 4. Convert 2.00 × 3 ft lbs 10 into grams per mL. 1 mL = 1 cm 3 ; 54 g = 1 lb 4
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