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Catalyst – September 4 2 , 2009 Grab a calculator!!!

Catalyst – September 4 2 , 2009 Grab a calculator!!!. If you know the density and the mass of an object, what formula would you use to calculate volume? Try this! Calculate the density of an object that has a mass of 13 grams and a volume of 5 cm 3. Today’s Agenda. Catalyst

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Catalyst – September 4 2 , 2009 Grab a calculator!!!

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  1. Catalyst – September 42, 2009Grab a calculator!!! • If you know the density and the mass of an object, what formula would you use to calculate volume? • Try this! Calculate the density of an object that has a mass of 13 grams and a volume of 5 cm3.

  2. Today’s Agenda • Catalyst • Density Formula Work • Density Graphs • Work Time • Exit Question

  3. Today’s Objectives • SWBAT calculate density using formula. • SWBAT calculate density using line graphs.

  4. What is Density?? Key Point #1: Density is the relationship between mass and volume

  5. MUSCLE vs. FAT

  6. Formula for Density • What is the unit for mass? • What are the different units for volume? • So what are the possible units for density? Grams (g) Rectangular-shaped solids: cm3 Irregular solids and Liquids: mL g/cm3 OR g/mL 1 cm3 = 1 mL

  7. Density Formula Work How do we find density (D)?

  8. Density Formula Practice • The mass of a can of air freshener is 112 g. The volume of the can is 118 mL. What is the density? • The massof a bottle of Shout Ultra Gel is 246 g. The volume of the bottle is 200 mL. What is the density?

  9. What if we already know density? How to find mass (M)? How to find volume (V)? M = D x V M V = D

  10. Density Formula Practice • The density of a Kit-Kat bar is 0.93 g/mL. The volume of the Kit-Kat is 10 mL. What is the mass? • The massof a Hershey’s bar is 43 g. The density of the Hershey’s bar is 1.72 g/mL. What is the volume?

  11. Class Work Time • You have 15 minutes to work on the worksheet – then we will go over the answers • Ask questions now if you have them!

  12. Why do scientists use graphs? • To organize, compare, and display experimental data • To make calculations and predictions

  13. Density Graphs Key Point #1: Density graphs are line graphs that have mass on the y-axis and volume on the x-axis.

  14. Density Graphs look like…. y-axis x-axis (mL)

  15. How to Graph Density • Label axes (x = volume, y = mass) • Title graph (y-axis vs. x-axis) • Determine scales • Plot each point • Draw trend line (line of best fit) For density graphs, the slope equals the density!

  16. Density Graph Example

  17. Class Work Time • Complete NUMBER ONE of your worksheet • Construct all graphs!

  18. Exit Question • What is the mass of an object with a volume of 3.2 cm3 and a density of 2.0 g/cm3? • What is the slope of a mass vs. volume graph equal to?

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