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?