1. A Day With Density

2. Physical Science Standard PS-3.1 Distinguish chemical properties of matter (including reactivity) from physical properties of matter (including boiling point, freezing/ melting point, density [with density calculations], solubility, viscosity, and conductivity).

3. Density Every object has a certain density Density can be used to identify objects

4. Density Density compares the mass of an object to its volume D = mass = g or g volume mL cm 3 Note: Remember 1 mL = 1 cm 3

5. Learning Check Osmium is a very dense metal. What is its density in g/cm 3 if 50.00 g of the metal occupies a volume of 2.22cm 3 ? a) 2.25 g/cm 3 b)22.5 g/cm 3 c)111 g/cm 3

6. Solution 2) Placing the mass and volume of the osmium metal into the density setup, we obtain D = mass = 50.00 g volume 2.22 cm 3 = 22.522522 g/cm 3 = 22.5 g/cm 3

7. Learning Check If blood has a density of 1.05 g/mL, how many milliliters of blood are donated if 575 g of blood are given? a) 548 mL b) 1250 mL c) 1830 mL

8. Solution 1)Solve for volume: v = m = 575g d 1.05g/ml v = 548ml

9. Volume Displacement A solid displaces a matching volume of water when the solid is placed in water. 33 mL 25 mL

10. Learning Check What is the density (g/cm 3 ) of 48 g of a metal if the metal raises the level of water in a graduated cylinder from 25 mL to 33 mL? a) 0.2 g/ cm 3 b) 6 g/cm 3 c) 252 g/cm 3 25 mL 33 mL

11. Solution b) 6 g/cm 3 Volume (mL) of water displaced = 33 mL - 25 mL = 8 mL Volume of metal (cm 3 ) 8 mL = 8 cm 3 Density of metal = mass/ volume 48g = 6g = 6 g/cm 3 8cm 3 cm 3

12. Learning Check3 Which diagram represents the liquid layers in the cylinder? (K) Karo syrup (1.4 g/mL), (V) vegetable oil (0.91 g/mL,) (W) water (1.0 g/mL) 1)2) 3) K K W W W V V V K

13. Solution (K) Karo syrup (1.4 g/mL), (V) vegetable oil (0.91 g/mL,) (W) water (1.0 g/mL) 1) K W V

14. Learning Check You have 3 metal samples. Which one will displace the greatest volume of water? 1 2 3 Discuss your choice with another student. 25 g Al 2.70 g/cm 3 45 g of gold 19.3 g/cm 3 75 g of Lead 11.3 g/cm 3

15. Solution 1) v = m = 25g = 9.2cm 3 d 2.70g/cm 3 25 g Al 2.70 g/cm 3

16. Dunkin’ for Density 1. Record the data table and Analysis/ Results questions into your lab notebook. Remember to leave space for your answers. 2. Follow the directions at your lab station to complete the activity and answer the questions.

17. List 3 – 4 characteristics that are the same for all four soda bottles. List 3 – 4 characteristics that are different for all four soda bottles.