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1-8 Density
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1-8 Density

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  • Density demo: http://www.middleschoolscience.com/dietcoke.htm
  • Transcript

    • 1. Warm-Up
      • For each of the following sets of variables, what is the proper axis?
        • volume & mass
          • Volume – x; mass – y
        • City & average rain fall
          • City – x; average rain fall – y
        • Max. upload speed & type of modem
          • Type of modem – x; max upload speed – y
    • 2. 1-8: Density
      • Objectives:
      • Relate densities of matter.
      • Apply density to other measurements.
    • 3. Density
      • How closely packed together the atoms and molecules of a substance are.
      • Amount of mass per unit of volume.
      • Measured in grams per milliliter or grams per cubic centimeter. (Which one depends on how the volume was measured.)
      • D = m/V g/mL
      • =
      • g/cm 3
    • 4. Low Density
      • Particles are far apart with lots of space between them.
      • A large volume has a small mass.
      • Tends to float in water.
    • 5. High Density
      • Particles are close together with little space in between them.
      • A small volume has a lot of mass.
      • Tends to sink in water.
    • 6. Density
      • More dense objects sink.
      • Less dense objects float.
      • Water has a density of 1.0 g/mL.
      • Draw a density column containing water, alcohol (0.74 g/mL) and oil (0.88 g/mL).
      • Where would a block, with a density of 0.95 g/mL rest if it were placed in the column?