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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