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Lacey_Che131_F2011_Lect-2s - Lec2 Measurements and units L...

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L 2 M d i Lec 2: Measurements and units 1 Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 Measurements UNITS MATTER!! ` Accurate measurements are essential for characterizing the physical and chemical properties of matter. ` Standardization of the units of measurements is i l essential. ` Quantitative easy to check ` Easy to agree upon, no personal bias ` The measuring instrument limits how good th t i 2 Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 the measurement is.
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Scientific Method A hypothesis is a tentative and Why are measurements important? testable explanation for an observation or a series of observations. A scientific theory is a general explanation of widely observed phenomena that have been extensively tested. Measurements are used to test th i d t bli h l 3 Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 theories and establish laws SI Units Quantity Base Unit Abbrev. Symbol Length meter m l Mass Time kilogram second kg s m t Temp Kelvin K T Amount mole mol n 4 Roy A. Lacey, Stony Brook University; Che 131, Fall 2011
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