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.

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Presentation transcript:

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)?

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 **

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

D M V

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?

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 g/ml g/ml g/ml -

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

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

IV. Frozen Lakes - Water is most dense at 4 o C in the Liquid phase. Just before it freezes into ice. ICE 00C00C 40C40C C air temp.

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.

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.