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# Density

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### Density

1. 1. 1. Water is a compound. 2. Water molecules are molecules. 3. The side of a water molecule is positive. 4. is the attraction between water molecules and other molecules. 5. Water has high tension. covalent polar hydrogen Adhesion surface
2. 2. ReviewReview Water Polar Surface tension
3. 3. • A measure of how much matter (mass) is contained in a volume of a material Mass – “stuff” Volume- “space” Density- how much “stuff” is in the “space” of a material DensityDensity
4. 4. DensityDensity • It is a consistent physical property of a material • It depends on the mass and the volume of a material
5. 5. DensityDensity Depends on: The type of atom(s) Copper atoms are more massive than aluminum atoms
6. 6. DensityDensity How tightly packed the atoms are Water molecules are closer together than O2 and N2 in the air
7. 7. DensityDensity Water – 1 g/cm3 Every cm3 weighs 1g 1 cm3 = 1mL Oil- 0.9 g/cm3
8. 8. DensityDensity D = m/V D = density in g/cm3 m = mass in g V = volume in cm3
9. 9. DensityDensity • Find mass with a balance or a scale • Find volume: • Length x width x height or • Water displacement
10. 10. • A steel block has a mass of 127.82g with a volume of 16.39 cm3 . What is the density of the steel block?