1. End Show © Copyright Pearson Prentice Hall Density > Slide 1 of 25 Determining Density Density 3.4

2. End Show © Copyright Pearson Prentice Hall Slide 2 of 25 Density > Determining Density Density: mass of an object per unit volume. 3.4 ~ Intensive property that depends only on the composition of a substance, not on the size of the sample. Table T

3. End Show © Copyright Pearson Prentice Hall Slide 3 of 25 Density > Determining Density The density of corn oil is less than the density of corn syrup. For that reason, the oil floats on top of the syrup. Density of water at room temp = 1.0 g/mL Density of ice =.92g/mL 3.4

4. End Show © Copyright Pearson Prentice Hall Slide 4 of 25 Density > Determining Density Mass: measured on a balance, grams Volume: solid – regular shape – l x w x h, cm 3 irregular shape – water displacement if m = 4 g, what is the density? d = 4 g/ 2 mL = 2 g/mL will it sink or float in water? Volume: liquid – use graduated cylinder 3.4

5. © Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 5 of 25 End Show 3.11 Now, use dimensional analysis to solve for the volume!

6. © Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 6 of 25 End Show tin = Sn Aug ’10

7. © Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 7 of 25 End Show June ’10 ans: (2) 2

8. © Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 8 of 25 End Show SPECIFIC GRAVITY ~is the relationship of density to a standard S.G. = density of a substance density of standard ~has no unit ~density of standard for solids & liquids is water, =1g/mL ~density of standard for gases is air, d=1.29g/L be careful!!!! memorize

9. © Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 9 of 25 End Show Oxygen gas has a density of 0.001429 g/cm 3. Determine its specific gravity. Density of a gas must be in g/L to compare with air for SG. Answer: = 1.1107751938 Final ans. (with SF): 1.108

10. © Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 10 of 25 End Show Determine the mass of a bar that measures 12. cm x 20. cm x 1.0 cm. It has a specific gravity of 2.78. Density of a solid must be in g/cm 3 to compare with water for SG. Answer: Final ans. with SF: 670 g

11. © Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 11 of 25 End Show 3.10 EXTRA EASY PROBLEM