Chapter%201-2

# Chapter%201-2 - 59 g = kg 3.13 nm = μ m 1.4 Measurements...

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Chpt 1: Measurements Chpt 1.4, 2.1 – 2.4

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1.4 Dimensional Analysis Typically we must convert units in chemistry Use conversion factors as ratios See practice sheet Always watch your units
1.4 Measurements Measurement: quantifying a substance on some dimension Common dimensions: (units) Length (meters) Mass (kilograms) Temperature (Kelvin) Time (seconds) Identical to Table 1.5 (p. 20)

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1.4 Metric Prefixes kilo (k) 10 3 centi (c) 10 -2 milli (m) 10 -3 micro ( μ ) 10 -6 nano (n) 10 -9 pico (p) 10 -12 You are responsible for those listed here That is, memorize them Use these prefixes for conversion factors: 1 cm = 1 *10 -2 m 31 pm = 31 *10 -12 m
1.4 Metric Prefixes You are also responsible for converting metric prefixes: 28.6 mm = ??? m

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Unformatted text preview: 59 g = ??? kg 3.13 nm = ??? μ m 1.4 Measurements: density • Density = mass / volume – Usually g/ mL or g/cm 3 – Note, mL = cm 3 – What volume of table salt (density = 2.16 g/mL) would be needed to measure out 145 g of salt? • Is density an extensive or intensive property? 1.4 Conversions Conversion Factor: 1 horsepower = 745.70 Watts • A car’s engine puts out 225 horsepower, how many watts is that? • A lightbulb requires 70 Watts, how much is that in horsepower? 1.4 Temperature • Celsius and Kelvin are common scales • K = C + 273.15 • Convert: 420 K to C You need to memorize this equation Not responsible for Farenheit conversions...
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## This note was uploaded on 01/19/2012 for the course CHEM 1211 taught by Professor Hair during the Spring '08 term at Kennesaw.

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Chapter%201-2 - 59 g = kg 3.13 nm = μ m 1.4 Measurements...

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