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Density

Density. What is density?. Density is a comparison of how much matter there is in a certain amount of space. Which one is more dense?. Demonstration: People in a square How about this: Which square is more dense?. # 1. # 2. Which one is more dense?. #1. #2. What is density?.

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Density

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  1. Density

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

  3. Which one is more dense? • Demonstration: People in a square • How about this: Which square is more dense? # 1 # 2

  4. Which one is more dense? #1 #2

  5. What is density? • Density = mass OR mass ÷ volume. volume • Units for density: g _g . cm3 ormL • Why are these the units for density? ALWAYS REMEMBER UNITS!

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

  7. Frank has a stapler. It has a mass of 9g and a volume of 3cm3. What is its density? 9g ÷ 3 cm3 = 3 g cm3 Frank also has a paper clip. It has a mass of 3g, and a volume of 1cm3. What is its density? 3g ÷ 1cm3 = 3 g cm3

  8. Work on these problems with your neighbor. • Jack has a rock. The rock has a mass of 6g and a volume of 3cm3. What is the density of the rock? __________ • Jill has a pack of gum. The gum has a mass of 8g and a volume of 2cm3. What is the density of the gum? ___________

  9. Jack has a rock. The rock has a mass of 6g and a volume of 3cm3. What is the density of the rock? 6g ÷ 3 cm3 = 2 g cm3 Jill has a pack of gum. The gum has a mass of 8g and a volume of 2cm3. What is the density of the gum? 8g ÷ 2cm3 = 4 g cm3

  10. Now, try these on your own. • Cassie has a watch. It has a mass of 4g and a volume of 2cm3. What is the density of the watch? ___________ • Tori has a wallet. It has a mass of 15g and a volume of 5cm3. What is the density of the wallet? ___________

  11. Cassie has a watch. It has a mass of 4g and a volume of 2cm3. What is the density of the watch? 4g ÷ 2 cm3 = 2 g cm3 Tori has a wallet. It has a mass of 15g and a volume of 5cm3. What is the density of the wallet? 15g ÷ 5 cm3 = 3 g cm3

  12. 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.

  13. Liquid Layers • Check out this picture. Which layer has the highest density? • Which layer has the lowest density? • Imagine that the liquids have the following densities: • 10g/mL 3g/mL • 6g/mL 5g/mL • Which number would go with which layer?

  14. Liquid Layers – Try with your neighbor • Which liquid has the highest density? • Which liquid has the lowest density? • Which liquid has the middle density?

  15. Liquid Layers – Try on your own! • Imagine that the liquids on the right have the following densities: • 15g/mL 10g/mL • 3g/mL 9g/mL • 7g/mL 12g/mL • Match the colors to the correct densities. 3g/mL 7g/mL 9g/mL 10g/mL 12g/mL 15g/mL https://www.youtube.com/watch?v=4EMUsPJtCoc

  16. Review • What is the formula for density? • What happens if you pour together liquids that have different densities? • Will the liquid on the top have the highest or lowest density? • Will the liquid on the bottom have the highest or lowest density?

  17. Review • What is the formula for density? D = m v • What happens if you pour together liquids that have different densities? They will form layers • Will the liquid on the top have the highest or lowest density? lowest • Will the liquid on the bottom have the highest or lowest density? highest

  18. Super Scientist Question of the Day • Jake has a book, a ruler, and a balance. • How can Jake find the density of the book with the tools he has?

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