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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
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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
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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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