unit 3 scientific measurement. types of measurement qualitative – gives results in nonnumeric,...
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Unit 3
Scientific Measurement
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Types of Measurement
• Qualitative– Gives results in nonnumeric, descriptive form.• Example: looking at a picture and evaluating if it’s a
good picture or not.
• Quantitative– Gives results in a definite form, usually in
numbers.• Example: looking at a picture and recording the exact
number of people, number of different kinds of animals, etc.
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Accuracy - v - Precision
• Accuracy = “closeness” to the standard or exact value.• Precision = “closeness” to the standard or exact value
of several measurements.*accuracy is the value of the measurement in terms of good
or bad whereas precision is how consistent (reproducible) the measurement is.
example: kicking field goalsaccuracy = kicking the ball between the uprights.precision = kicking the ball between the uprights and
each kick travels the same path.**precision depends on more than one measurement**
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Scientific Notation
• Chemistry involves very small and very large numbers.– Example: 1 gram of Hydrogen =
301,000,000,000,000,000,000,000 hydrogen molecules. This is a long number to write.• Use scientific notation:
– 36,000 is written 3.6 x 104 (3.6 x 10 x 10 x 10 x 10)
• If it’s a small number such as .00036 use scientific notation:– .00036 is written 3.6 x 10-4
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Multiplication/Division/Addition/Subtraction
• Mathematics Review (pg. 31)
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Significant Figures
• = include all the digits that are known precisely plus one last digit that is estimated.– Write down 1-6 on pg. 33 in your book– Do pg. 34, #7 a-f