# 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.

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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

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

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

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

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)

Scientific Notation Examples

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

EXTRA NOTES NOT APPLICABLE

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

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

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

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

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 = ?

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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