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9/20/10 Physical Science

Purpose : To be able to define & calculate densities and be able to make the measurements to get density. 9/20/10 Physical Science. Agenda Get out your warm up sheet Warm up Few notes on density ½ class take measurements lab practicum ½ class work on density practice problems Switch

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9/20/10 Physical Science

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  1. Purpose: To be able to define & calculate densities and be able to make the measurements to get density. 9/20/10 Physical Science Agenda • Get out your warm up sheet • Warm up • Few notes on density • ½ class take measurements lab practicum • ½ class work on density practice problems • Switch • Finish lab practicum for homework lecturePLUS Timberlake

  2. 9/20/10 warm up • What is mass? What are the metric units of mass? • What is volume? What are the units of volume? lecturePLUS Timberlake

  3. New piece of paper: Density notes • What is density? • How do we calculate density? lecturePLUS Timberlake

  4. Please write 3-step method at the top of your notes b/c it is required for density problems. 3 steps: • Write equation in words. • Plug in values with units. • Write answer with units and box it! lecturePLUS Timberlake

  5. Density compares the mass of an object to its volume Density = mass in g (or g volume mL cm3) D = • When do you use g/cm3? • Only when it’s a solid or if the problem gives you those units! lecturePLUS Timberlake

  6. Be able to use it every way! • d=m/v • m= ? -m=dv • v=? • v= m/d lecturePLUS Timberlake

  7. Learning Check 1 Osmium is a very dense metal. What is its density in g/cm3 if 50.00 g of the metal occupies a volume of 2.22cm3? lecturePLUS Timberlake

  8. Volume Displacement A solid displaces a matching volume of water when the solid is placed in water. 33 mL 25 mL lecturePLUS Timberlake

  9. Learning Check 2 What is the density (g/mL) of 48 g of a metal if the metal raises the level of water in a graduated cylinder from 25 mL to 33 mL? 33 mL 25 mL lecturePLUS Timberlake

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