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Density

Density. UNIT 1 , TOPIC 5 I can determine the density of matter. What is density?. Density is a comparison of how much matter there is in a certain amount of space. Each substance has its own unique density, based on the size of particles and how many particles can “fit into” a given space.

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Density

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  1. Density UNIT 1 , TOPIC 5 I can determine the density of matter

  2. What is density? • Density is a comparison of how much matter there is in a certain amount of space. • Each substance has its own unique density, based on the size of particles and how many particles can “fit into” a given space.

  3. Which one is more dense? WHY??? It has more particles in the same amount of space

  4. Which one is more dense? • Now which one is more dense? WHY??? It has less space for the same number of particles

  5. How do you calculate density? • Density = mass OR mass ÷ volume. volume M = mass D = density V = volume Density = mass volume Mass = density x volume Volume = mass density

  6. Density can also be described as the amount of mass contained in a given volume. Units used for a solid: g/cm3 Units used for a liquid: g/mL

  7. Mass(g): the amount of matter in a substance. (Then what is weight?) • Weight(g): The gravitational pull on an object. • You would weight less on the moon, but your mass would be the same. • Volume(cm3 or L): the amount of space an object takes up

  8. Let’s try a density problem together • Example 1: Frank has a paper clip. It has a mass of 9g and a volume of 3cm3. What is its density? D = m v D = 9g 3 cm3 D = 3 g/cm3

  9. Work on these problems with your neighbour. • Example 2: Jack has a rock. The rock has a mass of 6g and a volume of 3cm3. What is the density of the rock? • Example 3: Jill has a gel pen. The gel pen has a mass of 8g and a volume of 2cm3. What is the density of the gel pen?

  10. Answers Example 2 Example 3 D = 6 g 3 cm3 D = 2 g/cm3 D = 8 g 2 cm3 D = 4 g/cm3

  11. Mass, Volume, or Density? • Example 4: If 25 mL of oil has a density of 2 g/mL, what is its mass? Mass = D x v M = 2 g/mL x 25 mL M= 50 g

  12. Mass, Volume, or Density? • Example 5: If a pencil weighs 4 grams and has a density of 2 g/cm3, what is its volume? Volume = m D V = 4 g 2 g/cm3 V = 2 cm3

  13. Practice Time!!! • Complete the worksheet: Mass, Volume, or Density? • Show the formula • Show what numbers (with units) you are using • give your final answer (WITH UNITS) 13

  14. 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.

  15. Liquid Layers • Which layer has the highest density? • Which layer has the lowest density? • Imagine that the liquids have the following densities: • 10g/cm3. 3g/cm3. • 6g/cm3. 5g/cm3. • Which number would go with which layer?

  16. Water • The density of water is 1.0g/mL • If something is more dense than water, it will sink. • If something is less dense than water, it will float. • Generally, liquids are less dense than solids and gases are less dense than liquids.

  17. Ready for some competition? • What is the formula for density? • D=m÷v • What are the units for the density of a solid? • g/cm3 • What happens if you pour together liquids that have different densities? • They form liquid layers

  18. And the final two… • What can you say about the density of the top layer? • It is the lowest • In general, what are less dense than liquids? • gases

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