Lecture_04_100411 - Lecture 4: Problem Solving Goal: Learn...

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Unformatted text preview: Lecture 4: Problem Solving Goal: Learn to write conversion factors for two units that describe the same quantity and use the conversion factors to change from one unit to another Outline (Timberlake Chapter 1.6-1.7):- Writing Conversion Factors (1.6)- Problem Solving (1.7) Problems for Extra Practice: 1.45, 1.47, 1.49, 1.51, 1.53, 1.55, 1.57, 1.59, 1.61 Equalities Equality is a relationship between two units that measure the same quantity Can be written for relationships between units of the metric system, between U.S. units, or between metric and U.S. units 1 m = 100 cm (metric b metric) 1 lb = 16 oz. (U.S. b U.S.) 1 in = 2.54 cm (U.S. b metric) Equalities between units of the same system are definitions with numbers that are exact . Example: 1 cm = 10 mm different systems (metric and U.S.) are measurements with numbers that are significant figures . Example: 1 qt = 946 mL (measured) Some Common Equalities Equalities on Food Labels The contents of packaged foods in the U.S. are listed in both metric and U.S. units indicate the same amount of a substance in two different units A conversion factor is a fraction obtained from an equality Equality: 1 in. = 2.54 cm is written as a ratio with a numerator and denominator can be inverted to give two conversion factors for every equality Conversion Factors 1 in. 2.54 cm 2.54 cm 1 in. and Conversion Factors Conversion factor is a ratio in which the numerator and the denominator are quantities from an equality or a given relationship Equality Conversion Factors 1 km = 1000 m 1 km 1000 m 1000 m 1 km and 1 gallon = 4 qt 1 gallon 4 qt 4 qt 1 gallon and 1 kg = 2.20 lb 1 kg 2.20 lb 2.20 lb 1 kg and 1 gallon of gas...
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This note was uploaded on 01/18/2012 for the course CHEM 120A taught by Professor Leahmiller during the Fall '11 term at University of Washington.

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Lecture_04_100411 - Lecture 4: Problem Solving Goal: Learn...

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