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

DIMENSIONAL ANALYSISPAGE 13 OF NOTEBOOK

Scientific Notation&

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

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

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

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

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 factorsExample: 1000 meter = 1 kilometer

or1km

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 ) ?

Answer to Group Activity 2

54.4 grams