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# Introduction to density

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I made these slides for a HS Chemistry course within my properties of matter unit while discussing intensive properties. After the slides, we discussed density demos (underwater volcano, candles in water and isopropyl, and liquid displacement of a gummy bear). Then, all students did a mini-lab: rainbow saltwater density straws. Homework was a density problem set.

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### Introduction to density

1. 1. W H A T D E T E R M I N E S T H E D E N S I T Y O F A S U B S T A N C E ? DENSITY
2. 2. Density Definition  The amount of matter in a given volume  “relative heaviness”  Intensive property  Density is constant for all sample size of a given substance Mass units: grams or kilograms Volume units: mL, L, or cm3 (solids)
3. 3. Density Calculation  Osmium is a very dense metal. If a piece of osmium has a mass of 50g and a volume of 2.22cm3, what is its density?
4. 4. Solve for Mass or Volume using the Formula Triangle
5. 5. At the Molecular Level
6. 6. Differences in density may help predict if an object sinks or floats (along with other forces such as buoyancy)
7. 7. Density of a Solid  Mass: balance (grams)  Volume: length x width x height= cm3 Phet Simulation Density of Cubes
8. 8. Density of an Irregular Solid  Mass: balance (grams)  Volume: Liquid displacement- the solid displaces (pushes away) a volume of water
9. 9. Density of a Liquid  Mass: balance (grams)  Volume: pour into graduated cylinder (mL)
10. 10. Applications  Density & Oil Spills  Oil (D= 0.85g/cm3) floats on the ocean surface (D= 1.02 g/cm3)  Clean-up techniques: skimming- machines that suck up oil like a vacuum cleaner
11. 11. Medical Uses  Bone density scan (X-rays): Bone density is related to bone strength, can diagnose osteoporosis, which makes bones more prone to breakage
12. 12. Identification  Diamond density is 3.5g/cm3, but Moissanite (a diamond simulant) is 3.21g/cm3
13. 13. Ocean Circulation Patterns
14. 14. Life Support in Space!  When sleeping, your warm breath is pushed upward and away from your face by the cooler, more dense air in the room  In space, hot air does not rise in zero gravity conditions, so need air circulation in International Space Station
15. 15. Rainbow Saltwater Density Straws: Mini-Lab Source: Steve Spangler