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Bell Work
Put in Scientific Notation
360 000000 g __________________
48000 m ______________________
.000056 cm ____________________
3.5 X 10 7 (DO THE OPPOSITE)___________
Top of page 15
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DIMENSIONAL ANALYSISPAGE 13 OF NOTEBOOK
Scientific Notation&
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Ojective:
Write numbers in Scientific Notation
Evaluate word problems using Scientific Notation
Evaluate Dimensional Analysis
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Main Idea
Read Aloud
Page 40
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WHAT IS SCIENTIFIC NOTATION?
SCIENTIFIC NOTATION:A SHORT WAY TO WRITE VERY SMALL OR
VERY LARGE NUMBERS
1,000,000,000,000 cm
1.0 X 1012 cm
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Rules for Scientific Notation
1. Put the Decimal after the 1st digit and drop the zeroes. 2400 ---- 2.4
2. To find the exponent count the number of places from the end of the number.
2400 ------ 2.4 x 103
Page 12
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Guided Practice:
Turn to Page 40 in your chemistry text book
Example Problem 2.2:
The diameter of the sun is 1,392,000 km
The density of the sun’s lower atmosphere is0.000000028 g/cm3
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MultiplicationMultiplication DivisionDivision1. Multiply
Coefficients
2. Add the exponents (base 10 remains)
1. Divide the coefficients
2. Subtract Exponents (base 10 remains).
Rules for Multiplication/Division in Scientific NotationPage 14
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Independent Practice
Page 41; Problems 11 & 12
Page 42; Problems 15 & 16
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What is Dimensional Analysis?
A systematic approach to solving problems that using conversions factors.
Conversion factor-ratio of equivalent factorsExample: 1000 meter = 1 kilometer
or1km
1000m
Reciprocal ?
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Guided Practice
Page 45; Problems 17 - 20
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Classwork/The Price of Gasoline
Assume that the Gasoline in Europe cost $0.989 per liter and the current price is $2.59 per gallon in the United States. Which country has the lowest price.1L = 1 quart 4 quarts = 1 gallon
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Answer to Group Activity 1
$3.96 /gallon
The European Gas is extremely expensive.
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Extra-Credit/Cooking Conversion
The density of peanut oil is 0.920 g/mL. There are 237 mL in a measuring cup. If a recipe calls for ¼ cup of peanut oil, How many grams of peanut oil are required(hint: .250= ¼ ) ?
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Answer to Group Activity 2
54.4 grams