03 Notes - Density and Sig Fig Calcs

# 03 Notes - Density and Sig Fig Calcs - Practice Solve to...

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Pluchino – Regents Chemistry Matter and Measurement – 03 Density and Sig Fig Calculations Aim: What role do significant figures play in calculations? Do Now: Hypothesize what will happen when each can of soda is placed in water. Justify your answer. Why does diet soda float and regular sink? Density: measure of how much matter is in a given space (how tightly packed the molecules of a material are). Think about population density… New York City Nebraska Density is measured in g/mL or g/cm 3 What factors affect density? Temperature Pressure Water (at 25°C) has a density of 1.0 g/mL What role do significant figures play in calculations? Multiplication and Division: the number of significant figures in the answer will be the same as the measurement with the fewest significant figures.

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Unformatted text preview: Practice: Solve to the correct number of significant figures. 7.3041 x 0.62 = 9.054 x 1.33 = 12.0 / 4.6743 = Addition and Subtraction: the number of places after the decimal point in the answer will be the same as the measurement with the fewest places after the decimal point. ***Looking at digits after the decimal place…not significant figures! Practice: Solve to the correct number of significant figures. 0.507 + 150.0 = 16.9036 – 8.31 = 121.0 + 0.00008 = Conclusions: Density measures how much “stuff” is in a given amount of space Use the formula D = m/v The density of a sample can change as the conditions change Significant figures are important in calculations o Multiplication and division rule… o Addition and subtraction rule…...
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## This note was uploaded on 01/01/2012 for the course CHEM 101 taught by Professor Donahue during the Spring '11 term at Long Island U..

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03 Notes - Density and Sig Fig Calcs - Practice Solve to...

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