1. Density

2. What Is Density ? The concentration of matter in an object. The concentration of matter in an object. Which box has more mass? Which box has more volume? Which box is more dense?

3. Time for a demo!!!! Jot down what you OBSERVE and INFER in the line provided. Time for a demo… Sink or Swim?

4. Phases of Matter – Density Objects have their highest density as a solid because the atoms are closest together.

5. Label the diagrams below: SOLID LIQUID GAS

6. The exception is ____________. Label the layers below for water : Solid, Liquid, and Gas There is one exception… WATER GAS SOLID LIQUID

7. Density cont… When an object is heated, it ________ and the atoms become _______ packed. Therefore the object becomes ____ dense. As temperature increases, density __________. This is called a __________ relationship. expands less decreases indirect

8. Density cont… When an object is cooled, it ________ and the atoms become _______ packed. Therefore the object becomes ______ dense. As temperature decreases, density __________. This is called a __________ relationship. contracts more increases indirect

9. Temperature vs. Density Temperature Density

10. Density cont… When an object is exposed to more pressure, its volume ___________ and the atoms become _______ packed. Therefore the object becomes _______ dense. As pressure increases, density __________. This is called a __________ relationship. decreases more increases direct

11. Density cont… When an object is exposed to less pressure, its volume ___________ and the atoms become _______ packed. Therefore the object becomes ______ dense. As pressure decreases, density __________. This is called a __________ relationship. increases less decreases direct

12. Pressure vs. Density Pressure Density

13. What happens if an object is split? Density remains the same!!!!!

14. WHY?? ?????? Because density is a constant. The mass to volume ratio stays the same.

15. Volume vs. Density Volume Density

16. How can we find density? Where can you always find the density formula? Pg 1 ESRT

17. Density Trick D = M/V M = ___x___ V = ___/___ DV MD

18. Density Problem Examples Example #1 What is the density of an object that has a mass of 3.0 g and a volume of 0.5 cm 3 ? Remember to WSS! (Write-out, Substitute, and Solve)

19. Density Problem Examples Example #2 What is the mass of a rock that has a density of 2.5 g/cm 3 and a volume of 4.0 cm 3 ? Remember to WSS! (Write-out, Substitute, and Solve)

20. Density Problems 1. Solve each problem using the density formula or the density trick. 2. For EACH PROBLEM, you must WSS!!!! Note: 1.0 cm 3 = 1.0 ml