 # Density is the mass per unit volume of an object.

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Density is the mass per unit volume of an object

Density = massD = m Volume V Density = love  Mass and volume are extensive properties. These values change depending on how much material you have.  Density is an intensive property. It does not change according to how much you have.

 Volume can be measure by Length x width x height or the Water Displacement method  Materials of lower density will float on materials of greater density. Density of water is 1.0 g/cm 3 1mL = 1cm 3 The appropriate units of density are: ◦ g/cm 3 for solids ◦ g/mL for liquids

 If you have various masses and volumes of an object you can graph your data and solve for the slope to find the density of that object. Slope = Δy or y 2 – y 1 Δxx 2 – x 1

X (cm 3 )Y (g) 217.84 435.68 653.52 871.38

 Plot X vs Y graph

Ex. 1) A piece of beeswax with a volume of 8.50cm 3 is found to have a mass of 8.060g. What is the density of the beeswax? Will it float or sink in a beaker full of H 2 O?

 Ex. 2) A sample of magnesium has a volume of 825.00 cm 3 and a density of 1.74 g/cm 3, what is the mass of Mg?

Ex. 3) The volume of water in a graduated cylinder is 27.0 mL. A piece of lead is slowly dropped into the cylinder giving the volume to become 130.2 mL. Given that lead’s density is 11.3g/cm 3 what is the mass of Pb?

 Ex. 4) An empty beaker has a mass of 25.83g. When it is filled with mercury, it’s new mass is 225.3g. If the density of mercury is 13.60 g/cm 3, what is the volume of the beaker?

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