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Chemistry Lecture Notes - August 28, 2006

Chemistry Lecture Notes - August 28, 2006 - (Sarah’s...

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August 28, 2006 (Sarah’s & Dayna’s Birthday!) Chemistry Lecture Notes Handling Numbers The number of atoms in 12g of carbon: 6.022 x 10 23 EE key or EXP key 6.022EE23 or 6.022EXP2 The mass of a single carbon atom in grams: 1.99 x 10- 23 N is a number between 1 and 10 568.762 – move decimal left n > 0 – 568.762 = 5.68762 x 10 2 0.00000772 – move decimal right – n < 0 – 0.00000772 = 7.72 x 10 -6 Addition or subtraction – write each quantity with the same exponent n, combine N1 and N2, the exponent, n, remains the same. Multiplication – Multiply N1 and N2, add exponents n1 and n2. Division – Divide N1 and N2, subtract exponents n1 and n2 Significant Figures o Any digit that is not zero is significant. 1.234 – 4 sig figs o 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 significant.
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