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Ch 100: Fundamentals for Chemistry
Chapter 2: Measurements & Calculations
Lecture Notes
Types of Observations
• Qualitative
– Descriptive/subjective in nature
– Detail qualities such as color, taste, etc.
Example: “It is really warm outside today”
• Quantitative
– Described by a number and a unit (an accepted reference scale)
– Also known as measurements
• Notes on Measurements:
• Described with a value (number) & a unit (reference scale)
• Both the value and unit are of equal importance!!
• The value indicates a measurement’s size (based on its unit)
• The unit indicates a measurement’s relationship to other physical
quantities
Example: “The temperature is 85
o
F outside today”
