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WARM UP8-26-13 Agenda Quiz Unit 1 Notes Unit 1-4 WS Unit 1 Density Work on online HW Homework Aug 28 – Online HW unit 1 Aug 31 - Test review WS Sept 2 – Test unit 1 1. Find the density of this solid, mass = 180 grams 2. Find the mass of an object if it takes up 4 cm 3 and has a density of 5 g/cm 3 3. Find the volume if an object weights 70 grams and has a density of 14 g/cm 3

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Unit 1-4 Rounding Measurements Accuracy- how close a measurement is to the actual value

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Rounding Measurements Precision- how frequently you get the same measurement when measuring in the same way

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Rounding Measurements Round the following numbers: 5.76 to the nearest tenths 453 to the nearest tens 3.685 to the nearest hundredths

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Scientific Notation Used to make numbers easier to deal with and to keep track of zeros Only one number before decimal! Using calculators with scientific notation: Number * 10 ^ (exponent) Number EE (exponent)

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Scientific Notation Examples

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Assignments Unit 1 density WS due today before leaving class Online HW Unit 1 Test review WS

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EXTRA NOTES NOT APPLICABLE

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Significant Figures Significant figures are used to indicate the preciseness of measurements - Significant figures consist of all the digits known with certainty as well as one estimated, or uncertain digit - Use for rounding answers

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Rules for Determining Significant Figures 1. Nonzero digits are always significant e.g. 643.5 has 4 sig figs 2. Zeros between nonzero digits are significant e.g. 909 has 3 sig figs 3. Zeros in front of non zero digits are not significant e.g. 0.00034 has 2 sig figs e.g. 00063

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Rules for Determining Significant Figures 4. Zeros both at the end of a number and to the right of a decimal point are significant e.g. 9.00 has 3 sig figs 5. Assume zero to the right of a number but to the left of the decimal point is not significant e.g. 4000 has 1 sig fig, but 30.0 has 3 sig figs

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Sig Fig Practice Determine the number of sig figs in each value a) 4658.2 b) 4006 c) 0.000265 d) 0065 e) 1.0065 f) 3.0 g) 700

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Sig Figs in Calculations When multiplying and dividing, round your answer to the least number of sig figs in the equation Multiplying and Dividing a) 12 x 4 = ? b) 1.0 x 623 = ?

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When adding and subtracting, round your answer to the least number of decimal places in any of the data you are given. Adding and Subtracting a) 3.11 + 1.2 = ? b) 9.899 – 2.23 = ? Sig Figs in Calculations

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