Scientific Notation and Significant Figures
2.2 Scientific Notation and Significant Figures
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
Imagine the difficulty of calculating the mass of 1 mole of electrons!
0.000000000000000000000000000000091 kg x 602000000000000000000000 ???????????????????????????????????
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
300,000,000 = 3.0 x 108 .000034 = 3.4 x 10-5
Scientific Notation Rules
? Only one number should be to the left of the decimal
? This is wrong: 34.0 x 10-4 ? This is wrong: .56 x 10-4 ? This is correct: 7.2 x 10-4
? If the number goes down, the exponent goes up ? If the number goes up, the exponent goes down
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