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Scientific Notation and Error. Scientific Notation. In science, we deal with some very LARGE numbers:. 1 mole = 602000000000000000000000. In science, we deal with some very SMALL numbers:. Mass of an electron = 0.000000000000000000000000000000091 kg.

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Presentation Transcript
slide2

Scientific Notation

In science, we deal with some very LARGE numbers:

1 mole = 602000000000000000000000

In science, we deal with some very SMALL numbers:

Mass of an electron =

0.000000000000000000000000000000091 kg

slide3

Imagine the difficulty of calculating the mass of 1 mole of electrons!

0.000000000000000000000000000000091 kg

x 602000000000000000000000

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slide4

Scientific Notation:

A method of representing very large or very small numbers in the form:

M x 10n

  • M is a number between 1 and 10
  • n is an integer
slide5

.

2 500 000 000

9

7

6

5

4

3

2

1

8

Step #1: Insert an understood decimal point

Step #2: Decide where the decimal must end

up so that one number is to its left

Step #3: Count how many places you bounce

the decimal point

Step #4: Re-write in the form M x 10n

slide6

2.5 x 109

The exponent is the number of places we moved the decimal.

slide7

0.0000579

1

2

3

4

5

Step #2: Decide where the decimal must end

up so that one number is to its left

Step #3: Count how many places you bounce

the decimal point

Step #4: Re-write in the form M x 10n

slide8

5.79 x 10-5

The exponent is negative because the number we started with was less than 1.

slide10

4 x 106

Multiply the front numbers then add the exponents

x 3 x 106

12

x 1012

Move the decimal behind the first number

1.2

x 1013

slide11

Divide the front numbers then subtract the exponents

1.2 x 109

 3 x 104

0.4

x 105

Move the decimal behind the first number

4

x 104

percent error
Percent Error
  • Mathematical measure of accuracy
  • Tells how far a measurement varies from the actual value

Actual Value – Measured Value

X 100

% Error =

Actual Value

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