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Lecture 2 - Density two main physical properties of matter...

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Density
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Mass & Volume two main physical properties of matter mass and volume are extensive properties the value depends on the quantity of matter extensive properties cannot be used to identify what type of matter something is if you are given a large glass containing 100 g of a clear, colorless liquid and a small glass containing 25 g of a clear, colorless liquid - are both liquids the same stuff? even though mass and volume are individual properties, for a given type of matter they are related to each other!
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Mass vs. Volume of Brass Mass grams Volume cm 3 20 2.4 32 3.8 40 4.8 50 6.0 100 11.9 150 17.9
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Volume vs. Mass of Brass y = 8.38x 0 20 40 60 80 100 120 140 160 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 Volume, cm 3 Mass, g Ratio of mass:volume is an intensive property value independent of the quantity of matter
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Volume Mass Density =
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Example 1.3 Decide if a ring with a mass of 3.15 g that displaces 0.233 cm 3 of water is platinum Density of platinum = 21.4 g/cm 3 therefore not platinum Compare to accepted value of the intensive property Since the equation is solved for the quantity you want to find, and the units are correct, substitute and compute mass = 3.15 g volume = 0.233 cm 3 density, g/cm 3 Given: Find: Equation: Find the equation that relates the given quantity to the quantity you want to find Volume Mass Density = 3 3 g/cm 13.5 cm 0.233 g 15 . 3 = = = d V m d
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Measurement and Significant Figures
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What Is a Measurement?
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