Lewis and Clark Start Out (1803)

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Presentation transcript:

Lewis and Clark Start Out (1803) Lecture Homework: Reading Chapter 2, sections 6-10 Mastering Chemistry Assignment #2 Chap. 2 1, 2, 4, 8-28 (even), 32, 34, 38-48 (even), 52, 56-62 (even), 66-72 (even), 80, 92 Lab – Experiment #2 Pre-lab

D.A. Practice If a person weighs 208 lbs, what is their mass in amu?

D.A. Practice If a person weighs 208 lbs, what is their mass in amu?

The Metric System ENERGY LENGTH VOLUME TIME MASS PRESSURE Built on BASE UNITS and PREFIXES Base Units: gram – g 2.35 g 1.673x10-24 g liter – L 3.78 L 4.3x103 L meter – m 100. m 5.29x10-11 m second – s 135 s 86400 s others 4.184 J 755 torr ENERGY LENGTH VOLUME TIME MASS PRESSURE

tera T 1x1012 giga G 1x109 mega M 1x106 kilo k 1x103 BASE BASE deci d 1x10-1 centi c 1x10-2 milli m 1x10-3 micro m 1x10-6 nano n 1x10-9 pico p 1x10-12

Metric Conversions Always put a 1 in front of the prefixed unit (m – micro, G – giga, c – centi, n – nano, T – tera) Always put the exponent in front of the base unit (L – liter, g – gram, m – meter, J – joule)

The Metric System 1 milligram 1 milligram  1 mg = 1x10-3 g 1 kilometer 1 kilometer  1 km = 1x103 m

The Metric System 1 microliter 1 microliter  1 mL = 1x10-6 L 1 gigabyte 1 gigabyte  1 GB = 1x109 B

Metric Conversions Convert 1.66 seconds to ms 1 ms 1 ms 1 ms = 1x10-6 s 1x10-6 s 1x10-6 s

Metric Conversions Convert 4.2533x10-2 mL to L 1 mL 1 mL 1 mL = 1x10-3 L 1x10-3 L 1x10-3 L

Metric Conversions Convert 98.5 cm to meters 1 cm = 1x10-2 m

Metric Conversions Convert 5.234x108 g to Mg 1 Mg = 1x106 g

Metric Conversions When converting from one prefixed unit to another always go to the base unit first! Convert 2.91x108 nm to km (nm  m  km) 1 nm = 1x10-9 m 1 km = 1x103 m 1 nm 1 nm 1x103 m 1x103 m

Metric Conversions When converting from one prefixed unit to another always go to the base unit first! Convert 0.1611 dL to mL (dL  L  mL) 1 dL = 1x10-1 L 1 mL = 1x10-3 L 1 dL 1 dL 1x10-3 L 1x10-3 L

Conversions Between Systems of Measure (English to Metric and Metric to English) Work the same way as metric to metric conversions… mostly Sig. Figs. These conversions are NOT defined, so they limit sig. figs. (other than the number “1”) Except inches to cm (1 in = 2.54 cm) Examples 1 gallon = 3.785 L, 1 kg = 2.20 lb, 1 mile = 1.609 km

Conversions Convert 781505 gallons to liters 1 gallon = 3.785 L   2.958x106 L  2.957996425x106 L  2.957996425x106 L