2.4- DENSITY - an important and useful physical property

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Presentation transcript:

2.4- DENSITY - an important and useful physical property Mercury Mercury platinum Platinum Aluminum 13.6 g/cm3 21.5 g/cm3 2.7 g/cm3

The most dense element is…. Osmium, coming in at …..22.61 g / cm3

And the least dense… Helium…..measuring in at 0.08988 g/L at STP

DENSITY Which is heavier? Brick Styrofoam It depends on how tightly packed your particles are… The more tightly packed = more dense Independent of how much of it you have (1 g or 100 g you will still have the same Density!) Brick Styrofoam

Cool…… Example: A cubic inch of Styrofoam weighs less and has less material within it than a cubic inch of lead. Both take up the same # of space in this world but the lead is much heavier thusly more dense. Scientists hypothesize (educated guess without proof) that some stars have such a great density that a teaspoon full of their matter (the material that makes them what they are) weighs more than the entire planet Earth!

Density The ratio of mass to volume for a substance. D = M / V

Density Questions

A piece of wood has a mass of 11 A piece of wood has a mass of 11.2 g and a volume of 23 mL what is the density? U= density I = 11.2 g and 23 mL Plan: D = g mL # Denisty = 11.2 g 23 mL = 0.49 g/mL

Calculating A piece of wood has a density of 0.93 g/mL and a mass of 23 g what is the volume? U = # mL I = 0.93 g/mL and 23 g Plan: Volume = mass/Density # mL = 23 g 0.93 g/mL = 25 mL

Density as a conversion factor Aluminum has a density of 2.70 g/cm3 What is the mass of 25 cm3 of aluminum? 25 cm3 2.70 g X = 68 g 1 cm3

Density is often used as a CF See SWB for all the example questions….