chem 101 chapter 1

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Tro, Principles of Chemistry: A Molecular Approach 38 The Standard Units • Scientists have agreed on a set of international standard units for comparing all our measurements called the SI units. ü Système International = International System Quantity Unit Symbol length meter m mass kilogram kg time second s temperature kelvin K
Tro, Principles of Chemistry: A Molecular Approach 39 Length • measure of the two-dimensional distance an object covers ü often need to measure lengths that are very long (distances between stars) or very short (distances between atoms) • SI unit = meter ü About 3.37 inches longer than a yard Ø 1 meter = distance traveled by light in a specific period of time • commonly use centimeters (cm) ü 1 m = 100 cm ü 1 cm = 0.01 m = 10 mm ü 1 inch = 2.54 cm (exactly)
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Practice—What is the mass in kilo
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chem 101 chapter 1

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