2. Density Properties
Density is a measure of how compact a material is: (please draw picture)
Density of most materials will decrease as temperature goes up because the atoms are moving much faster and spread out.

5. 3) Objects with lower densities float in mediums with a higher density
3) Objects with lower densities float in mediums with a higher density. This is why balloons float.
Demos:
Methane Bubbles & flame ramp
Wine glass with water and other with soda

6. Density Calculations D = m/V
Density = Mass / Volume
D = m/V
Sample Problem: Find the density of a block of material that has a mass of 40kg and a volume of 2L.

8. Activity: Find the density of 5 metal bars (20pts)
Name:________ Date:_____ Period:____ Objective: Students will find the density of the 5 bars of metal and then find the percent error. Procedure: (you write) Data: (show quantity with units) Calculations: (for density and percent error) Conclusions: (short overview of lab, results, & source of error…. In complete sentences) Find what the mystery metal is made of: (show all of your work and give explanation)

9. Data Table
Metal
Mass (g)
Volume (ml)
Density (g/ml)
Percent Error
Aluminum
Copper
Tin
Lead
Zinc
Sample Calculation: Must do one sample calculation for each one

10. For each metal, find the percent error:
Accepted Values for Density of Metals
Aluminum 2.70 g/mL
Brass 8.40 g/mL
Copper 8.92 g/mL
Iron 7.87 g/mL
Lead g/mL
Silver g/mL
Steel 7.85 g/mL
Tin 7.28 g/mL
Zinc 7.14 g/mL

11. Text Problems
Pg 91 (46-47)
Pg 93 (50-56)