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CHEM 1405
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What is a measurement?
* quantitative observation
* comparison to an agreed upon standard
* every measurement has a
number
and a
unit
Scientific Notation
* also called exponential notation
* used to write large numbers in small format
a.bcd x 10
^{e}
a.bcd = coefficient
e = exponent
^{}
Exponents
* positive exponent means 1 multiplied by 10 e times
* negative exponent means 1 divided by 10 e times
Metric System
Quantity Unit Symbol
length meter m
mass kilogram kg
time second t
temperature kelvin k
Prefix Multipliers
kilo
: larger than the base unit 1km = 1000m = 10
^{3}
m
centi
: 100x smaller than base unit 1cm = 0.01m = 10
^{-2}
m
milli
: 1000x smaller than base unit 1mm = 0.001m = 10
^{-3}
m
Base Units
Mass gram g
Length meter m
Time seconds s
Author
mtobias0223
ID
34948
Card Set
CHEM 1405
Description
Chapter 2
Updated
2010-09-15T20:53:34Z
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