DO NOW…. Which liquid has the highest density? 5 2 3 1 4 Coussement, DeSchepper, et al., Brain Strains Power Puzzles  2002, page 16 least dense 1 < 3.

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DO NOW…. Which liquid has the highest density? Coussement, DeSchepper, et al., Brain Strains Power Puzzles  2002, page 16 least dense 1 < 3 < 5 < 2 < 4 most dense

Density Density is an INTENSIVEproperty INTENSIVE property of matter. - does NOT depend on quantity of matter. -Examples: color, melting point, boiling point, odor, density DIFFERENT THAN EXTENSIVE properties - depends on quantity of matter. - mass, volume, length Styrofoam Brick

Density M = D x V D = M VM V V = M DM D D M V ensity ass olume

Density calculations Density = Mass / Volume Everybody LOVES Density D =

Density calculations Density = Mass / Volume “Density breaks my heart” D =

Density of Some Common Substances Density of Some Common Substances Substance Density (g / cm 3 ) Air * Lithium 0.53 Ice Water 1.00 Aluminum2.70 Iron 7.86 Lead 11.4 Gold 19.3 Density of Some Common Substances Substance Density (g / cm 3 ) Air * Lithium 0.53 Ice Water 1.00 Aluminum2.70 Iron 7.86 Lead 11.4 Gold 19.3 *at 0 o C and 1 atm pressure

Consider Equal Masses Equal masses… …but unequal volumes. The object with the larger volume (aluminum cube) has the density. aluminum gold Dorin, Demmin, Gabel, Chemistry The Study of Matter, 3 rd Edition, 1990, page 71 smaller Christopherson Scales Made in Normal, Illinois USA

Comparing Densities (g/cm 3 ) Jaffe, New World of Chemistry, 1955, page water 1.0 ice cork aluminum 2.7

Measuring Volume by Displacement Used for irregularly shaped objects Copyright © Cengage Learning. All rights reserved

Density Practice Problems 1.What is the density of carbon dioxide gas if g occupies a volume of 100. mL? g 100. mL 1.96 x g/mL D = M VM V

Density Practice Problems 2.An irregularly shaped stone has a volume of 5.0 mL. The density of the stone is 1.75 g/mL. What is the mass of this stone? 1.75 g/mL x 5.0 mL 8.8 g M = D x V

Density Practice Problems 3.A sample of iron has a mass of 94 g and a density of 7.8 g/cm 3. What is the volume of the iron? 94 g 7.8 g/cm 3 12 cm 3 V = M DM D