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Published byCory Goodwin Modified over 9 years ago
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Aim: What is Density? Do Now: In your notebooks, explain what you think determines an objects density? And then, try to explain how you would find an objects density (formula/steps/process)?
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I. Density: The amount of matter in a specific volume. - A physical property of matter. - Measured in g/cm 3 or g/ml. - Every object has it’s own unique density. D = M V ** Density of an object remains the same no matter how many pieces it’s broken into **
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Using the one density formula you can rearrange the variables to solve for mass and volume. Density Mass Volume =Density Mass =Density xVolume Mass Volume = Density
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D M V
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II. Buoyancy vs. Density Buoyancy is an objects ability to float in water. - determines if an object will sink, float or remain neutral in water. What does neutrally buoyant look like?
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Which color liquid is most dense? Which color liquid is least dense? Where would a metal sphere with a density of 3.0g/ml land? 5.4 g/ml - 4.3 g/ml - 2.9 g/ml - 1.3 g/ml -
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Example: Compare the density of H 2 O (water) to the density of an ice cube. THINK An ice cube floats in H 2 O because it has a density that is… a) Equal to the density of water b) Greater than the density of water c) Less than the density of water d) None of the above
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III. Density of Water and Ice - As water freezes it expands. (increases volume) - This make ice less dense than water Ice always floats the same in water no matter the size or shape. ice
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IV. Frozen Lakes - Water is most dense at 4 o C in the Liquid phase. Just before it freezes into ice. ICE 00C00C 40C40C -10 0 C air temp.
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Why does a steel ship float in water? Densities in grams / cm3 D (water) = 1.0 g / cm3 D (wood) = 0.8 g / cm3 D (steel) = 7.8 g / cm3 D (lead) 11.3 g / cm3 D (air).0012 g / cm3 Answer: A ship has a steel shell that is hollow inside. The volume is mostly air. The ship and air together have a density less than water.
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Closure: From the back table, top bin; take a density review worksheet from the top bin to work on in class with your partner using your notes.
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