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Chap._1_Units_of_Measurement

# Chap._1_Units_of_Measurement - Chapter 1 Matter Measurement...

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Chapter 1 Matter, Measurement, and Problem Solving Chemistry: A Molecular Approach , 1 st Ed. Nivaldo Tro 2008, Prentice Hall Roy Kennedy Massachusetts Bay Community College Wellesley Hills, MA

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Units of Measure
Tro, Chemistry: A Molecular Approach 3 The Standard Units Scientists have agreed on a set of international standard units for comparing all our measurements called the SI units Système International = International System Quantity Unit Symbol length meter m mass kilogram kg time second s temperature kelvin K

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Tro, Chemistry: A Molecular Approach 4 Length Measure of the two-dimensional distance an object covers often need to measure lengths that are very long (distances between stars) or very short (distances between atoms) SI unit = meter About 3.37 inches longer than a yard 1 meter = one ten-millionth the distance from the North Pole to the Equator = distance between marks on standard metal rod = distance traveled by light in a specific period of time Commonly use centimeters (cm) 1 m = 100 cm 1 cm = 0.01 m = 10 mm 1 inch = 2.54 cm (exactly)
Tro, Chemistry: A Molecular Approach 5 Mass Measure of the amount of matter present in an object weight measures the gravitational pull on an object, which depends on its mass SI unit = kilogram (kg) about 2 lbs. 3 oz. Commonly measure mass in grams (g) or milligrams (mg) 1 kg = 2.2046 pounds, 1 lbs. = 453.59 g 1 kg = 1000 g = 10 3 g 1 g = 1000 mg = 10 3 mg 1 g = 0.001 kg = 10 -3 kg 1 mg = 0.001 g = 10 -3 g

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Tro, Chemistry: A Molecular Approach 6 Time measure of the duration of an event SI units = second (s) 1 s is defined as the period of time it takes for a specific number of radiation events of a specific transition from cesium-133
Tro, Chemistry: A Molecular Approach Temperature measure of the average amount of kinetic energy

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Chap._1_Units_of_Measurement - Chapter 1 Matter Measurement...

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