Aim: What is Density? Do Now: In your notebooks, explain what you think determines an objects density? Then, try to explain how you would find an objects density (formula/steps/process)?

I. Density: The amount of matter (mass) in a specific space (volume). - describes how packed the molecules are within an object. - Measured using g/cm3 or g/ml. - Every object has it’s own unique density. D = M Density of an object remains the same no matter how many pieces it’s broken into V

Using the density formula you can solve for mass and volume. = Density Mass Density Density = Volume Mass = Density x Volume Do not Copy

M D V

What does neutrally buoyant look like? II. Buoyancy vs. Density Buoyancy is an objects ability to float in water. - density helps determine if an object will sink (negative buoyancy), float (positive buoyancy) 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? 1.3 g/ml - 2.9 g/ml - 4.3 g/ml - 5.4 g/ml -

III. Density of Water and Ice As water freezes it expands (increases volume) while the mass remains the same. This make ice less dense than water ice ice

How do we know 40C is in the liquid phase? IV. Frozen Lakes - Water is most dense at 4oC in the Liquid phase. Just before it freezes into ice. -100C air temp. ICE 00C 40C How do we know 40C is in the liquid phase?

Closure1 : 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 (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 2: From Top Do Now Bin; take a density review worksheet from the top bin to work on in class with your partner using your notes.