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School

Colorado State University
Department

Chemistry

Course Code

CHEM 107

Professor

Mallory Monique Mentele

Fundamentals of Chemistry

Chemistâ€™s View of the World

Macroscopic â€“ observe â€“ what we can see

Particulate â€“ imagine â€“ what we canâ€™t see

Symbolic â€“ represent â€“ communication

What about numbers?

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

Exponents and Scientific Notation

Scientific notation â€“ 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 â€“ recorded digits, both certain and uncertain

Rules for significance:

â€» All non-zero digits are significant: 1-9

â€» Zeros between two non-zero numbers are significant

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