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# 1-8 Density

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• Density demo: http://www.middleschoolscience.com/dietcoke.htm
• ### 1-8 Density

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