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Density

Reminders: Lab Report due tomorrow. Density. 18. September 18. Warm - Up: density Today’s Agenda: 1. Denser than H2O Yes-No Activity 2. Density Notes & Powerpoint 3. Calculating density. 28. density. Draw it:. Connect it:. a comparison of how much matter there is in

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Density

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  1. Reminders: Lab Report due tomorrow Density 18 September 18 Warm - Up: density Today’s Agenda: 1. Denser than H2O Yes-No Activity 2. Density Notes & Powerpoint 3. Calculating density

  2. 28. density Draw it: Connect it: a comparison of how much matter there is in a certain amount of space. float or sink units: g/ml or g/cm3

  3. 29. physical or chemical property 31. physical or chemical property 30. physical or chemical property 32. physical or chemical property

  4. Denser than H2OYes- No Activity

  5. Billiard ball

  6. Beach ball

  7. Golf ball

  8. Basketball

  9. Marble

  10. Bowling ball

  11. Anchor

  12. Log

  13. Tennis ball

  14. Volley ball

  15. Ping pong ball

  16. Inner tube

  17. Rubber duck

  18. Brick

  19. Cork

  20. Notes

  21. What is density? • Density is a comparison of how much matter there is in a certain amount of space.

  22. Which one is more dense? • Demonstration: Atoms in a square • How about this: Which square is more dense? use the words mass & volume

  23. Which one is more dense? • Now which one is more dense?

  24. ALWAYS REMEMBER NUMBERS HAVE LAST NAMES! What is density? • Density = mass OR mass ÷ volume. volume • Units for density: g OR _g_ cm3 mL • Why are these the units for density? • What equipment do we use to measure density?

  25. Let’s try a density problem together! • Frank has a paper clip. It has a mass of 9g and a volume of 3cm3. What is its density? • Frank also has an eraser. It has a mass of 3g, and a volume of 1cm3. What is its density?

  26. Let’s try a density problem together: • Will a can of Coke float or sink in water? Volume = 355 mL Mass = 394 g • Will a can of Diet Coke float or sink in water? Volume = 355 mL Mass = 346 g

  27. Liquid Layers • If you pour together liquids that don’t mix and have different densities, they will form liquid layers. • The liquid with the highest density will be on the bottom. • The liquid with the lowest density will be on the top.

  28. Sink or Float • if an object/liquid has a smaller density than the liquid that it is place in it will FLOAT • if an object/liquid has a greater density than the liquid that it is place in it will SINK 27

  29. Water has a density of 1 g/cm3

  30. Liquid Layers • Observe this density column. • Blue layer is water (density = 1 g/cm3) • Which layer(s) have a density greater than water? • Which layer(s) have a density less than water? • Imagine that the liquids have the following densities: • 3 g/cm3.85 g/cm3. • 8 g/cm3 • Which number would go with which layer?

  31. Which liquid has the highest density? • Which liquid has the lowest density? • What is the density of water?

  32. Liquid Layers – Try on your own! • Imagine that the liquids on the right have the following densities: • 15g/cm3 10g/cm3 • 3g/cm3 9g/cm3 • 7g/cm3 12g/cm3 • Match the colors to the correct densities. 3g/cm3 7g/cm3 9g/cm3 10g/cm3 12g/cm3 15g/cm3

  33. Why do lemons float and limes sink?

  34. Using Density Pyramid

  35. Strategy for Solving Word Problems 1. Read problem, what are you solving for? 2. Whatclues are in the problem? 3. Use the appropriate triangle. 4. Substitute the numbers 5. Solve, do the math -multiply numbers, if next to each other -divide numbers, if on top of each other 6. write answer with units

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