Lecture_02_010612 - Lecture 2: Scientific Communication...

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Lecture 2: Scientific Communication • Outline (Zumdahl Ch. 1 & Appendix 1 & 2) : - Mathematical Procedures (A1.1, A1.5, A1.6) - Units of Measurement and Conversions Among Units (App. 2) • Problems for Extra Practice: - worksheet posted on web • Office Hours: Mon. 11:30 am±12:30 pm, Wed. 11:00 am±noon
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Scientific Communication • Measurements or observations must be communicated unambiguously – Reporting measurements • Units (SI) • Scientific notation • Prefixes • Significant digits – Describe as precise and/or accurate
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Stating a Measurement In every measurement, a number is followed by a unit . Observe the following examples of measurements: Number and Unit 35 m 0.25 L 225 lb
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The SI System Scientists recognized that a standard system of units was needed if measurements were to be useful In 1960, an international agreement set up a system of units called the International System (SI) Based on the metric system and units derived from the metric system Related decimal systems based on 10
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SI Base Units All other units are derived from this system.
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Quantity Definition of Quantity SI unit Area Length squared m 2 Volume Length cubed m 3 Density Mass per unit volume kg/m 3 Speed Distance traveled per unit time m/s Acceleration Speed changed per unit time m/s 2 Force Mass times acceleration of object kg·m/s 2 ( =newton, N) Pressure Force per unit area kg/(m 2 ) ( = pascal, Pa) Energy Force times distance traveled kg·m 2 /s 2 ( = joule, J)
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Common SI b English Conversions
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Importance of Units!
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This note was uploaded on 01/18/2012 for the course CHEM 142B taught by Professor John during the Winter '11 term at University of Washington.

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Lecture_02_010612 - Lecture 2: Scientific Communication...

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