Density Properties Density is a measure of how compact a material is: (please draw picture) Density of most materials will decrease as temperature goes.

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Presentation transcript:

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.

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. http://www.cleanvideosearch.com/media/action/yt/watch?v=bQ0Ha2p8GjI&feature=related&safety_mode=true&persist_safety_mode=1&safe=active Demos: Methane Bubbles & flame ramp Wine glass with water and other with soda

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.

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)

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

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 11.29 g/mL Silver 10.50 g/mL Steel 7.85 g/mL Tin 7.28 g/mL Zinc 7.14 g/mL

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