1. 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, (even), 52, (even), (even), 80, 92
Lab – Experiment #2 Pre-lab

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

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

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

6. 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

7. 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)

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

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

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

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

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

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

14. 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

15. Metric Conversions When converting from one prefixed unit to another
always go to the base unit first!
Convert 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

16. 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 = L, 1 kg = 2.20 lb, 1 mile = km

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