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Matter…matters

Matter…matters. More Matter presents. Density. Density. Density is a property of matter One way to identify a substance is by its density. Gold or “Fool’s Gold?” (pyrite). How to find DENSITY. Step 1: Measure the mass Step 2: Measure or calculate the volume. Finding Volume.

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Matter…matters

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  1. Matter…matters More Matter presents... Density

  2. Density • Density is a property of matter • One way to identify a substance is by its density. Gold or “Fool’s Gold?” (pyrite)

  3. How to find DENSITY • Step 1: Measure the mass • Step 2: Measure or calculate the volume

  4. Finding Volume

  5. Volume of Irregular Shapes • Step 1: Read the graduated cylinder. http://www.morrisonlabs.com/meniscus.htm • Step 2: Place the object in the cylinder • Step 3: Read the graduated cylinder. • Step 4: Calculate the difference of the water displacement to find the volume of the irregular shape.

  6. Step 3 • Density = mass divided by volume

  7. Practice Calculating Density Calculate the density for each item. D = M / V Mass: 15 g Volume: 20 mL Mass: 1000 g Volume: 50 mL Mass: 225 g Volume: 100 mL Mass: 10 g Volume: 200 mL Density = .75 Density = 20 Density = 2.25 Density = 0.05 www.middleschoolscience.com 2008

  8. The king wants to pick out a new crown but only wants one made of 100% pure gold, not gold plated or mixed with other metals. Can you help him find his new gold crown? The volume of each crown is 60 cm3 Densities of Metals Lead – 11.34 g/cm3 Gold -19.3 g/cm3 Silver -10.5 g/cm3 Platinum - 21.4 g/cm3 Copper - 8.9g/cm3 A = 680.4 g B = 534 g C = 1,158 g D = 1,284 g D = M / V L. LaRosa http://www.middleschoolscience.com for T. Trimpe 2008 http://sciencespot.net/

  9. D = M / V The volume of each crown is 60 cm3 D = 1158 / 60 D=19.3 g/cm3 D = 680.4 / 60 D=11.34 g/cm3 A = 680.4 g C = 1,158 g D = 534 / 60 D=8.9 g/cm3 D = 1284 / 60 D=21.4 g/cm3 B = 534 g D = 1,284 g

  10. The king wants to pick out a new crown but only wants one made of 100% pure gold, not gold plated or mixed with other metals. Can you help him find his new gold crown? The volume of each crown is 60 cm3 Densities of Metals Lead – 11.34 g/cm3 Gold -19.3 g/cm3 Silver -10.5 g/cm3 Platinum - 21.4 g/cm3 Copper - 8.9g/cm3 LEAD COPPER A = 680.4 g B = 534 g GOLD! PLATINUM C = 1,158 g D = 1,284 g D = M / V

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