Transcript Scientific Notation – A method for expressing and working with very

Org/Pre Data
Dependent
Variable
• Line Graph
Independent
Variable
Used to display data that changes frequently or
continuously
Organization & Presentation
of Data
• Scientists use written reports and oral
presentations
• Tables
• Graphs
– Bar
– Line graph
– Pie graph
Org/Pre
• Bar Graph
Compare similar data for several individual items or events
Org/Pre
• Circle/Pie Graph
Presenting data that are parts of a whole
Org/Pre
• Precision
– Exactness of measurement
• Accuracy
– How close measurement is to true value
Org/Pre
• Significant Figures
• 1) ALL non-zero numbers (1,2,3,4,5,6,7,8,9) are
ALWAYS significant.
• 2) ALL zeroes between non-zero numbers are ALWAYS
significant.
• 3) ALL zeroes which are SIMULTANEOUSLY to the right
of the decimal point AND at the end of the number are
ALWAYS significant.
• 4) ALL zeroes which are to the left of a written decimal
point and are in a number >= 10 are ALWAYS
significant.
Org/Pre
• Sig Figs cont
• Answers are only as precise as the least
precise measurement used in the
calculation
– 6.3421 + 12.1=
– 88.716 X 89.4324=
– Pg 28
Sig Figs
• http://www.chemfiesta.com
• Significant Figures Practice Worksheet
• How many significant figures do the following
numbers have?
• 1) 1234 _____
• 2) 0.023 _____
• 3) 890 _____
• 4) 91010 _____
• 5) 9010.0 _____
Sig Figs
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http://www.chemfiesta.com
Significant Figures Practice Worksheet
6) 1090.0010 _____
7) 0.00120 _____
8) 3.4 x 104_____
9) 9.0 x 10-3_____
10) 9.010 x 10-2_____
Scientific Notation
A method for expressing and working with very large or
very small numbers.
Rules:
1. The coefficient must be greater than or equal to 1
and less than 10. (uses significant figures)
2. The base must be 10.
3. The exponent must show the number of places to
move the decimal point.
Write the number 567,000 in scientific notation.
Exponents
• A positive exponent means move the decimal to the
right when changed to standard notation!
• A negative exponent means move the decimal to
the left when changed to standard notation!
Sci Notation
• https://www.youtube.com/watch?v=AWof6
knvQwE
– Music!!!
• http://www.aaamath.com/dec71idec2sci.html
– Practice!!!
Write the number 0.004567 in scientific
notation.
Write the number 7.98 x 108 in standard
notation.
Write the number 8.21 x 10-4 in standard
notation.