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# DENSITY

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TEMA PARA LA MATERIA DE QUÍMICA...t/t

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### DENSITY

1. 1. DensityQBA Miguel A. Castro Ramírez
2. 2.  Why did the liquids settle in a specific order? Why did some object float while some sunk. Whycan some heavier objects float while some lighter objects sink?
3. 3. Density… Is a property of all matter: solids, liquids and gases. Is found by dividing an object’s mass by its volume. Units for mass: _____ Units for volume: _____
4. 4. Density… Measures how tightly matter is packed within an object Symbol = rho (ρ)
5. 5. Calculating Density Mass ---------- = Density Volume
6. 6. Examples A block with a volume  Mass = 52.5 g of 15 cubic centimeters has a mass of 52.5  Volume = 15 cm3 grams. What is its density?  Divide! Mass------------  Density = 3.5 g/cm3 Volume
7. 7. Examples A die (1.0 cm on each  Mass = 3.6 g side) has a mass of 3.6 g. What is its density?  Volume = 1.0 cm3 Mass  Divide!------------ Volume  Density = 3.6 g/cm3
8. 8. Examples Youhave a piece of metal with a volume of 245 cm3 and a mass of 612 g. Is it aluminum (which has a density of 2.70 g/cm3)?A 14.0 cm3 ice cube has a density of 12.83 g. What is the density? Compare this to the density of water. What does this tell you about the ice?
9. 9. Examples A jar has a volume of  Oxygen: 0.00133 g/cm3 953 cm3. If a scientist measures the mass of  Nitrogen: 0.00117 g/cm3 the gas in the jar at 0.158 g, what gas is probably in the jar?  Helium: 0.00016 g/cm3 0.000166 g/cm3  Hydrogen: 0.00008 g /cm3
10. 10. Examples A jar has a volume of  Oxygen: 0.00133 g/cm3 953 cm3. If a scientist measures the mass of  Nitrogen: 0.00117 g/cm3 the gas in the jar at 0.158 g, what gas is probably in the jar?  Helium: 0.00016 g/cm3 0.000166 g/cm3  Hydrogen: 0.00008 g /cm3