Transcript Objectives - Thinkport.org

Objectives
To be able to
 Convert between different units of the
metric system
 Solve problems using conversion factors
Drill:
Which of the following would be the best
piece of equipment to measure out 15.00
mL of water?
a) 100 mL Burette
b) 15 mL beaker
c) 25 mL graduated cylinder
d) 15 mL Erlenmeyer flask
e) 15 mL pipet
Homework:

Complete Worksheet

Safety project due Thursday 1/30
WHY DO WE USE THE METRIC
SYSTEM?
Almost all other countries are using the
metric system
 Other countries’ companies are refusing to
buy products from the U.S. if not labeled in
metric units
 Scientists need a universal way to
communicate data (SI Units)

THE METRIC CONVERSION
CHART (STAIRCASE METHOD)
Kilo
1000 Hecto
units
100 Deka
units
10
To convert to a smaller unit, move
decimal point to the right or
multiply.
Basic
Unit Deci
0.1 Centi
units 0.01 Milli
units 0.001
units
To convert to a larger unit, move
decimal point to the left or divide
units
Base Units of Measurement
 meter (m)
 Time  second (s)
 Mass  gram (g)
 Volume  liter (L)*
 Temperature  Kelvin (K)
 Length
Metric or SI prefixes
htt://chemistry.about.com/od/convertcalculate/a/metricprefix.htm
Prefix
yotta
symbol
Y
x from 10x
24
1,000,000,000,000,000,000,000,000
zetta
Z
21
1,000,000,000,000,000,000,000
exa
E
18
1,000,000,000,000,000,000
peta
tera
giga
mega
kilo
hecto
deca
base
deci
centi
milli
micro
nano
P
T
G
M
k
h
da
d
c
m
μ
n
15
12
9
6
3
2
1
0
-1
-2
-3
-6
-9
1,000,000,000,000,000
1,000,000,000,000
1,000,000,000
1,000,000
1,000
100
10
1
0.1
0.01
0.001
0.000001
0.000000001
pico
femto
atto
zepto
p
f
a
z
-12
-15
-18
-21
0.000000000001
0.000000000000001
0.000000000000000001
0.000000000000000000001
yocto
y
-24
0.000000000000000000000001
Dimensional Analysis
 Also
A
called the factor label method
structured way of helping you to
convert units. With this method, you
can easily and automatically convert
very complex units if you have the
conversion formulas.
Steps of Dimensional Analysis
1.
2.
3.
4.
Write the given value with units
Determine the correct conversion factors
Write each conversion factor as a fraction
so the units will cancel
Cancel units and perform math