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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?