1. Writing Numbers in Scientific Notation:
12 340
1. Locate the decimal point.
2. Move the decimal point to obtain a number between 1 and 10.
1.234
3. Multiply the new number by 10n .
Where n is the number of places you moved the decimal point.
1.234 x 104
(only one digit before the decimal, but not zero.)

2. Writing Numbers in Scientific Notation, Continued
1. Locate the decimal point.
2. Move the decimal point to obtain a number between 1 and 10.
1.2340
3. Multiply the new number by 10n .
Where n is the number of places you moved the decimal point.
x 10-4
(only one digit before the decimal, but not zero.)
Tro's "Introductory Chemistry", Chapter 2

3. Practice—Write the Following in Scientific Notation
= x 102
= x 100
= 1.45 x 105
= 2.34 x 10-3
= 1.23 x 10-2
= x 101
= x 10-6
= 1.45 x 100
Tro's "Introductory Chemistry", Chapter 2

4. Tro's "Introductory Chemistry", Chapter 2
Exponents:
When the exponent on 10 is positive the number is larger than one.
Sun’s diameter = x 109 m
= m
Decimal point moved
9 places to the right
Tro's "Introductory Chemistry", Chapter 2

5. Tro's "Introductory Chemistry", Chapter 2
Exponents
When the exponent on 10 is negative the number is smaller than one.
Average atom’s diameter = 3 x m
= m.
Decimal point moved
10 places to the left.
Tro's "Introductory Chemistry", Chapter 2

6. Practice—Write the Following in Standard Form
2 100
4.02
2.1 x 103 = 9.66 x 10-4 = 6.04 x 10-2 =
4.02 x 100 = 3.3 x 101 = 1.2 x 107 = 33
Tro's "Introductory Chemistry", Chapter 2