# UNIT II.4 Density. II.4 DENSITY Definitions: Mass = Density =

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UNIT II.4 Density

II.4 DENSITY Definitions: Mass = Density =

II.4 DENSITY Example 1: A 3.50mL chunk of boron has a mass of 8.19 g. What is the density of the boron?

II.4 DENSITY Example 2: (p. 24 ex b) If mercury has a density of 13 600 g/L, what volume (in mL) is occupied by 425 g of mercury?

II.4 DENSITY Important Facts: Fact #1 : For water at 4°C, d = 1000.0 g/L or d = 1.0000 g/mL Given this density, knowing the volume of water gives its mass and vice versa. 1g = 1 mL (for water)

II.4 DENSITY Fact #2: LESS DENSE objects and liquids will float on liquids having a GREATER density. Object will SINK if: d OBJECT > d LIQUID Object will FLOAT if: d OBJECT < d LIQUID For example, a cork will float and a rock will sink in water! QUESTIONS: p. 26 #32-40

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