Chemistry Notes - Measurement & Calculations Involving The Mole
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3Chemistry Notes
Chapter 5,6 - Measurement & Calculations Involving the Mole
Section 5.1-5.3 - Scientific Notation, Significant Figures, and Unit Conversions
Accuracy = a measurement that is close to the actual value
Precision = a measurement that is repeatedly the same
n
Scientific notation = M x 10
where M = digit (1.0-9.9); n=whole number integer
Significant figure = digits that are measured with precision and accuracy
Rules:
1. Digits 1-9 are always significant
2. Zeroes are never significant as placeholders
3. Except - when zero is between two other significant digits
Or when zero is the last digit at the end of the number after the decimal
Unit Conversions
Dimensional Analysis - converting from one system of unit to another by conversion factors
Length
1 m
= 1.094 yards
2.54 cm = 1 inch
1 mile = 5280 feet
1 mile = 1760 yards
Mass
1 kg
= 2.205 pounds
453.6 g = 1 pound
Volume
1 Liter = 1.06 quarts
3
1 foot
= 28.32 Liters
Temperature
Kelvin
= ° T
+ 273
Celsius
°T
= 1.80 (°T
) + 32
Fahrenheit
Celsius
°T
= (°T
- 32) x 5/9
Celsius
Fahrenheit
Density = Mass / Volume
Mrs. Drurey
- 1of 3 -
Newton South High School
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