Department

ChemistryCourse Code

CHEM 107Professor

Mallory Monique MenteleLecture

1This

**preview**shows half of the first page. to view the full**3 pages of the document.**Fundamentals of Chemistry

Chemist’s View of the World

Macroscopic – observe – what we can see

Particulate – imagine – what we can’t see

Symbolic – represent – communication

What about numbers?

Measurements involve numbers, regardless of high-tech or low-tech data collection

Exponents and Scientific Notation

Scientific notation – used to represent very large or small numbers as powers of 10

M x 10n

.00002 is 2 x 10-5

2,000,000 is 2 x 106

For numbers greater than 10, shift the decimal point left by n places until you obtain a

number between 1 and 10.

For numbers less than 1, shift decimal point right until you obtain a number between 1 and

10.

Positive exponent: shift right

Negative exponent: shift left

Significant Figures

Every measure include some uncertainty

Significant figures – recorded digits, both certain and uncertain

Rules for significance:

※ All non-zero digits are significant: 1-9

※ Zeros between two non-zero numbers are significant

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