Transcript Scientific Notation &
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 10 12 cm
Page 12 Rules for Scientific Notation 1.
Put the Decimal after the 1 st zeroes. 2400 ---- 2.4
digit and drop the 2.
To find the exponent count the number of places from the end of the number. 2400 ------ 2.4 x 10 3
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 Page 14 Notation 1.
Multiplication
Multiply Coefficients 1.
Division
Divide the coefficients 2. Add the exponents (base 10 remains) 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: 1000 meter = 1 kilometer or 1km 1000m Reciprocal ?
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 ) ?