Measurement And Chemical Calculations
Measurement
And
Chemical Calculations
Measurement in Every Day Life
Measurement:
? How tall are you?
? What is the temperature outside?
? How many inches of rain did Lubbock get?
Exact number: No uncertainty
? 7 days in a week
? 24 hours in a day
? 100 cents in a dollar
Depending on who is doing the measurement there
could be a difference in the reported value.
Types of Observations and
? We make QUALITATIVE
observations of reactions changes
in color and physical state.
? We also make QUANTITATIVE
MEASUREMENTS, which involve
numbers.
? Use SI units based on the metric
system
UNITS OF MEASUREMENT
Use SI units based on the
metric system
Length
Meter, m
Mass
Kilogram, kg
Time
Seconds, s
Celsius degrees, ?C
kelvins, K
Exponential Notation
? Use exponents to represent very large
or very small numbers.
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