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Lecture3

# Lecture3 - Chem 1P Lecture 3 Units Numbers Chang Section...

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Chem 1P Lecture 3: Units & Numbers

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Measurements: units and numbers Chang Section 1.7 The result of a quantitative scientifc measurement is expressed in a number and a unit
Tools: Units of Measurement International System (SI) based on the metric system Table 1.1 Fundamental units of the SI system Physical Quantity Name of Unit Abbreviation Mass kilogram kg Length meter m Time second s Temperature kelvin K El. Current ampere A Amount of substance mole mol Chang Section 1.7

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Tools: Numbers Chang Section 1.7
mass Chang Section 1.7 The standard SI unit of mass is kilogram (kg) In chemistry, we often use the gram (g) as the practical unit for mass 1 kg = 1000 g = 1 x 10 3 g length The standard SI unit of length is meter (m) The meter is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second

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volume Chang Section 1.7 Volume is derived from the unit of length (length 3 ) The SI unit for volume is cubic meter (m 3 ) 1 cm 3 = (1 x 10 -2 m) 3 = 1 x 10 -6 m 3 1 dm 3 = (1 x 10 -1 m) 3 = 1 x 10 -3 m 3
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