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Date: 9-11-13 Day Plan: Presentations Scientific Notation Tomorrow Density vs. Weight

Date: 9-11-13 Day Plan: Presentations Scientific Notation Tomorrow Density vs. Weight Pre-lab (lab tomorrow) Opener: A. 0.002030 D. 0.004300 B. 1.005 E. 1000.1 C. 0.00860 F. 230.1 + 2.4234 G. 2.0550 X 2.433 =.

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Date: 9-11-13 Day Plan: Presentations Scientific Notation Tomorrow Density vs. Weight

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  1. Date: 9-11-13 • Day Plan: Presentations Scientific Notation Tomorrow Density vs. Weight Pre-lab (lab tomorrow) • Opener: • A. 0.002030 D. 0.004300 • B. 1.005 E. 1000.1 • C. 0.00860 F. 230.1 + 2.4234 G. 2.0550 X 2.433 =

  2. A. 0.002030 (4) D. 0.004300 (4) • B. 1.005 (4) E. 1000.1 (5) • C. 0.00860 (3) F. 230.1 + 2.4234 =232.5 G. 2.0550 X 2.433 =5.000

  3. Density Why some things float and others sink.

  4. First things first…mass vs. weight • Mass: the amount of matter that an object contains • Measured in grams • Always remains constant • Weight: a force that measures the pull of gravity on a certain mass • Measurement can change depending on location • Example: on the moon • DiscoveryEducation Mass Vs. Weight Video Clip

  5. Density • Ratio of mass of an object to it’s volume • Intrinsic property • Depends on the composition of an object, not on the size of the sample • Demo (human density demo) • Density = mass ÷ volume • Units: g/mL or g/cm3

  6. Density • Physical property of matter • Everything has a unique density • The measure of the relative "heaviness" of objects with a constant volume • How closely "packed" or "crowded" the material appears to be

  7. Important Densities • Density of AIR: • 0.0013 g/mL • Density of WATER: • 1.00 g/mL

  8. Volume • The amount of space an object takes up • Units of measurement: • Liters • Milliliters • Centimeters cubed (cm3)

  9. 9 cm Height 8 cm Width 10 cm Length Measuring Volume We can measure the volume of regular object using the formula length x width x height. _______ X _______ X _______ = ________ Length Width Height Volume (cm3)

  10. Measuring Volume We can measure the volume of irregular object using water displacement. Amount of H2O with object = ______About of H2O without object = ______Difference = Volume = ______

  11. Reading a graduated cylinder Read the measurement based on the bottom of the meniscus or curve. When using a real cylinder, make sure you are eye-level with the level of the water. What is the volume of water in the cylinder? _____mL

  12. Calculating Density

  13. Practice • A copper penny has a mass of 3.1 g and a volume of 0.35 cm3. What is the density of copper? • Step 1: List Variables • Step 2: List equation Density = mass ÷ volume • Step 3: Substitute and Solve = 3.1 ÷ 0.35 = 8.8571 g/cm3

  14. More Practice • A student finds a shiny piece of metal that she thinks is aluminum. In the lab, she determines that the metal has a volume of 245 cm3 and a mass of 612 g. Calculate the density. • Density = 612 ÷ 245 • Density = 2.50 g/cm3

  15. One More… • A bar of silver has a mass of 68.0 g and a volume of 6.48 cm3. What is the density of silver? • Density = 68.0 ÷ 6.48 • Density = 10.5 g/cm3

  16. Density Video Buoyancy- an upward force exerted by a liquid, gas or other fluid, that opposes the weight of an immersed object

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