CHEM 107 Lecture 1: CHEM 107 - Lecture 1Premium
3 pages89 viewsFall 2017
Course CodeCHEM 107
ProfessorMallory Monique Mentele
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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
Positive exponent: shift right
Negative exponent: shift left
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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