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Density

Density. Tutorial created by: Courtney Richardson. What is Density?. Density is how much space matter takes up Density is found by taking your mass divided by your volume

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Density

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  1. Density Tutorial created by: Courtney Richardson

  2. What is Density? • Density is how much space matter takes up • Density is found by taking your mass divided by your volume • Density is measured in grams/millimeters when involving solids or liquids, but if involving gas it is measured in grams/liters

  3. More about Density • The density of water is 1.00g/ml • If an object is less then 1.00g/ml then it will float, if it is more then it will sink

  4. Mass • Mass is the amount of matter an object has • Mass is almost always measured in grams when dealing with density • Is usually measured with a balance when dealing with itself

  5. Volume • Volume is the amount of space an object occupies • Volume in a density problem involving solids and liquids is measured in millimeters • On the other hand, in a problem that involves gas, volume is measured in liters

  6. An example: • You have 45g of a substance that occupies a volume of 7.36ml, what is the density? • Remember Density=Mass/volume • The mass is 45g and the volume is 7.36ml next slide

  7. Continued: • So then take 45g and divide it by 7.36ml • Your density will come out to 6.1141304347826086956521739130435g/ml • You round that to the nearest hundredth and you get 6.11g/ml

  8. One more example: • This one is a little harder • If you have 884g of mercury at a volume of 65ml, what is the density of the mercury? • If you take 884g divided by 65ml you will get 13.6g/ml

  9. Sink or Float? • If the density of water is 1.00g/ml and an object had a density of .336g/ml, will it sink or float? • It will sink because it is less that 1.00g/ml

  10. Question #1 • What is the density of a board in which the dimensions are: 5.54cmx10.6cmx199cm and whose mass is 28.6g? (round to the nearest thousandth) Answer

  11. Answer #1 • First you take the dimensions and multiply them to get your volume: 5.54cmx10.6cmx199cm= 11686.076cm3 or 11686.076ml Then take your mass and divide it by your volume: 28.6g/11686.076ml=0.002447g/ml Density = 0.002g/ml

  12. Question #2 • What is the density of a rectangular box with dimensions that are: 8cmx6cmx5cm and a mass of 500g? (round to the nearest hundredth) Answer

  13. Answer #2 • First take the dimensions and find the volume: 8cmx6cmx5cm=240cm3 or 240ml Then take your mass and divide it by your volume: 500g/240ml=2.083g/ml Density= 2.08g/ml

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