Density Notes and Prelab Answers

Notes 9/9/13
Scribe Author: Georgia A

Intensive Properties vs. Extensive Properties 

Intensive Properties

• Do NOT depend on how much you have 
• DOES depend on what the substance is 

(Ex: Density, Solubility) 

Extensive Properties 

• DO depend on how much you have 
• Does NOT depend on what it is 

(Ex: Mass, Volume) 

    Density =   __Mass__ (extensive)    unit = grams 

(Intensive)       Volume   (extensive)    unit = mL

*Density is a derived unit = grams/mL


Help With Calculations.....

M (Mass) = D x V
D (Density) = M / V
V (Volume) = M / D





OR


                                 

Density = M / V










In the lab, we will not measure density directly. We will measure.......


Mass

• Find using a balance (digital scale) 

Volume 

• Find 2 different ways

1. Regular objects 

      length x width x height 

  * 1㎤ = 1mL

2. Irregular Object 

       Use water displacement 

Ending Volume - Starting Volume = Volume of the object












A Few Extra Tips.....

• Density is a physical property 
• Water has a density of 1g/mL  (same as 1g/㎤)
• Less dense things float on top of more dense things 

Beverage Lab Prelab Questions

1.  3 sig figs 

2. 12.53 g     = 1.52 g/mL

    8.27 mL

3.         49 g (sugar)                           d= 1.043 g/mL

     355 mL (beverage)                     % sugar concentration 

                 

                                                            (g sugar / g beverage) x 100 

Turn this into grams and use 

density to do it! 

 

M = D x V

M = 1.043 g/mL x 355mL         _ 49g  sugar           x100   =    13%

M = 370 g beverage                  370 g beverage 

           

next scribe post author: Kevin G.