Week 2 Notes unifinshed
Week 2 Notes unifinshed CH111
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This 1 page Class Notes was uploaded by Jordyn Meekma on Friday September 23, 2016. The Class Notes belongs to CH111 at Northern Michigan University taught by Dr. Tom Getman in Fall 2016. Since its upload, it has received 3 views. For similar materials see General Chemistry 1 in Chemistry at Northern Michigan University.
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Date Created: 09/23/16
CH 111 Notes: Week 2 Significant Figures o Integers: all integers are significant 24.7 = 3 sig figs o Zeros: Zeros at the beginning of a number are never significant 0.47 → 0 is not a sig fig (2 sig figs) Zeros at the end of a number after a decimal are always significant 1.50 → 0 is a sig fig (3 sig figs) Zeros between two nonzero integers are always significant 3.506 → 0 is a sig fig (4 sig figs) Zeros at the end of a number with no decimal may/may not be significant 300 = ? *Need to use scientific notation* 3.00x10 = 2 3 sig figs o Multiplication/Division: the answer should have the same number of sig figs as the number with the least amount of significant digits 97.11/2.50 = 38.8 = 3 sig figs o Addition/Subtraction: the answer should have the number of sig figs as the measured number with the fewest digits to the right of the decimal 0.2817 + 0.61 = 0.89 Practice Problems o What is the mass of a gold bar with dimensions 10.0 cm x 5.25 cm x 3.50 cm? 3 (Density of 3old = 19.3 g/cm ) 3 (19.3 g/cm )( 10.0 cm x 5.25 cm x 3.50 cm) = 3550 g = 3.55x10 g (3 sig figs) o
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