1. Measuring Volume & Density By: Brianna Shields September 14, 2005

2. DO NOW 1. Name the unit used to label mass 2. What is the first step for using a triple beam balance? 3. What tool is used to measure length?

3. Volume of a liquid Definition The amount of space a liquid takes up

4. Volume of a liquid Tool Graduated Cylinder

5. Volume of a liquid Units Milliliters (ml)

6. Volume of a liquid Formula Read the volume level from the bottom of the meniscus

7. Volume of an irregular solid Definition The amount of space a solid takes up

8. Volume of an irregular solid Tool Graduated cylinder

9. Volume of an irregular solid Units Milliliter (ml)

10. Volume of an irregular solid Formula Measure the difference in water levels

11. Volume of a cube Definition The amount of space a cube takes up

12. Volume of a cube Tool Metric Ruler

13. Volume of a cube Units Centimeters cubed (cm 3 )

14. Volume of a cube Formula Volume = length x width x height

15. Example What is the volume of the liquid at left?

16. Example What is the volume of the liquid at left?

17. What is the volume of the object ?

18. Example What is the volume of the cube at left?

19. Density Definition The number of particles that can be packed into a space

20. Density Tool Graduated cylinder or metric ruler AND triple beam balance

21. Density Units G.C. = g/ml Ruler = g/cm 3

22. Density Formula Density = mass divided by volume D =m/v

23. Density How to calculate density 1. Find the mass in g 2. Find the volume in ml or cm 3 3. Divide the mass by the volume 4. Round to the nearest tenth 5. Label answer with correct units

24. Density of Water Water’s Density 1.0 g/ml

25. Density Sink or Float? When d > 1.0 g/ml = sink When d< 1.0 g/ml = float

26. Density Estimating Density of sinking object is simply > 1.0 Density of floating object = % of object below water level

27. Density Cutting an object Density of a pure substance is always the same regardless of size

28. Example What is the density of the object to the left if m=79.4 g, v= 29.8 cm 3?

29. Example Which of the objects would sink? Float? Explain Densities of Common Elements and Compounds Water = 1.0 g/ml Methanol=.79 g/ml Gold 19.30 g/ml Air=.0013 g/ml Iron= 7.8 g/ml Ice=.93 g/ml Mercury= 13.5 g/ml Aluminum= 2.7 g/ml Ethanol=.94 g/ml Oak= 0.85 g/ml

30. Example How would these materials layer in a container? Densities of Common Elements and Compounds Water = 1.0 g/ml Methanol=.79 g/ml Gold 19.30 g/ml Air=.0013 g/ml Iron= 7.8 g/ml Ice=.93 g/ml Mercury= 13.5 g/ml Aluminum= 2.7 g/ml Ethanol=.94 g/ml Oak= 0.85 g/ml

31. Example Estimate the density of the material at the left

32. Example Estimate the density of the material at the left

33. Example Estimate the density of the material at the left

34. Example This block has a density of 10.0 g/cm 3. What is the density of the block at the left if it is cut in half?

35. Practice Work with your lab partner Complete the volume and density practice questions in your handout We will go over the correct answers next class

36. Hands On: Volume ObjectToolWorkAnswer 1. MarbleGraduated Cylinder

37. Hands On: Volume ObjectToolWorkAnswer 2. ToyGraduated Cylinder

38. Hands On: Volume ObjectToolWorkAnswer 3. Block 1RulerV = lxwxh

39. Hands On: Volume ObjectToolWorkAnswer 4. Block 2RulerV = lxwxh

40. Hands On: Volume ObjectToolWorkAnswer 5. Mystery Liquid Graduated cyclinder

41. Hands On: Density Object 1 Mass Volume

42. Hands On: Density Object 1 Density Answer Sink or Float

43. Hands On: Density Object 2 Mass Volume

44. Hands On: Density Object 2 Density Answer Sink or Float

45. Practice: Volume and Density 1a. What is the volume of liquid in the graduated cylinder on the right? 1a. V= 1b. If an object is placed into the same graduated cylinder and the water level rises up to 25 ml, what is the volume of the object? 1b. V=

46. Practice: Volume and Density 2. Calculate the volume of the cube 2. V= 3. The following measurements are taken of a wood block. Length =2.3cm, width = 6.0 cm, height = 4.2 cm. What is the cube’s volume? 3. V=

47. Practice: Volume and Density 4. Place the objects where they belong when placed into a container of water 4.

48. Practice: Volume and Density 5. If a bar of soap has a mass of 57.0 grams and a volume of 112 cm 3, what is its density? Label your answer. Will it sink or float in water? 5.