 Density is a measure of how much matter (objects that take up space) is compacted in an area.  What is the formula? Density = mass OR mass ÷ volume.

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Presentation transcript:

 Density is a measure of how much matter (objects that take up space) is compacted in an area.  What is the formula? Density = mass OR mass ÷ volume. volume  Units for density: g cm 3

How close the atoms or molecules are to each other More than “heaviness” - density includes how much space an object takes up!! All substances have density including liquids, solids, and gases

Density of pure water = 1.0 g/cm 3  If an object has a density greater the 1.0 g/cm 3 it will sink in water.  If an object has a density less than 1.0 g/cm 3 it will float in water.

 If you break a piece off of an object...Will it have a different density than the whole piece?  NOOOOOOO!!! Density is based on total mass divided by total volume. When one changes, the other also changes, so the density stays the same!!!

 If I increase volume what happens to density?  If I decrease volume what happens to density?  If I increase mass what happens to density?  If I decrease mass what happens to density?

 A piece of wood has a mass of 18 grams and a volume of 30 cm3. What is the density of the wood? Will it float?

 A small rock has a density of 1.4 g/cm3 and a mass of 70 grams. What is its volume? Will it Float? What part of the equation tells if it will or won’t?

EquationMassVolumeDensitySink/Float 12 g0.5 cm 3 16 g0.2 g/cm 3 5 cm 3 20 g/cm g0.3 g/cm 3 6 g4 cm 3 8 g1.8 cm 3 13 cm 3 9 g/cm g15 cm 3 2 cm g/cm 3 17g3 g/cm 3

Osmium is a very dense metal. What is its density in g/cm 3 if g of the metal occupies a volume of 2.22cm 3 ? 1) 2.25 g/cm 3 2)22.5 g/cm 3 3)111 g/cm 3

2) Placing the mass and volume of the osmium metal into the density setup, we obtain D = mass = g = volume2.22 cm 3 = g/cm 3 = 22.5 g/cm 3

A solid displaces a matching volume of water when the solid is placed in water.

What is the density (g/cm 3 ) of 48 g of a metal if the metal raises the level of water in a graduated cylinder from 25 mL to 33 mL? 1) 0.2 g/ cm 3 2) 6 g/m 3 3) 252 g/cm 3