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Chemistry Lecture Notes
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Handling Numbers
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The number of atoms in 12g of carbon: 6.022 x 10
23
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EE key or EXP key
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6.022EE23 or 6.022EXP2
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The mass of a single carbon atom in grams: 1.99 x 10
23
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N is a number between 1 and 10
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568.762 – move decimal left n > 0 – 568.762 = 5.68762 x 10
2
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0.00000772 – move decimal right – n < 0 – 0.00000772 = 7.72 x 10
6
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Addition or subtraction – write each quantity with the same exponent n, combine
N1 and N2, the exponent, n, remains the same.
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Multiplication – Multiply N1 and N2, add exponents n1 and n2.
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Division – Divide N1 and N2, subtract exponents n1 and n2
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Significant Figures
o
Any digit that is not zero is significant.
1.234 – 4 sig figs
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Zeros between nonzero digits are significant – 606 – 3 sig figs
o
Zeros to the left of the first nonzero digit are not significant – 0.08 L – 1
sig fig
o
If there is a decimal point in the number, the zeros at the end are
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 Fall '06
 Woodrum
 Chemistry, Atom

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