Transcript Scientific Notation &amp

Top of page 15
Bell Work
 Put in Scientific Notation
360 000000 g __________________
48000 m ______________________
.000056 cm ____________________
3.5 X 10 7 (DO THE OPPOSITE)___________
Scientific Notation
&
DIMENSIONAL
ANALYSIS
PAGE 13 OF NOTEBOOK
Ojective:
 Write numbers in Scientific Notation
 Evaluate word problems using Scientific
Notation
 Evaluate Dimensional Analysis
Main Idea
Read Aloud
Page 40
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
Rules for Scientific Notation
Page 12
1.
2.
Put the Decimal after the 1st digit and drop the
zeroes. 2400 ---- 2.4
To find the exponent count the number of places
from the end of the number.
2400 ------ 2.4 x 103
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 is
0.000000028 g/cm3
Rules for Multiplication/Division in Scientific
Notation
Page 14
Division
Multiplication
1.
Multiply Coefficients
2. Add the exponents
(base 10 remains)
1.
Divide the
coefficients
2.
Subtract Exponents
(base 10 remains).
Independent Practice
Page 41; Problems 11 & 12
Page 42; Problems 15 & 16
What is Dimensional Analysis?
 A systematic approach to solving problems that using
conversions factors.
 Conversion factor-ratio of equivalent factors
Example:
Reciprocal ?
1000 meter = 1 kilometer
or
1km
1000m
Guided Practice
 Page 45; Problems 17 - 20
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
Answer to Group Activity 1
$3.96 /gallon
The European Gas is extremely
expensive.
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 )
?
Answer to Group Activity 2
54.4 grams