Separating Mixtures http://www.youtube.com/watch?v=jWdu_RVy5_A The components of a mixture can be separated based on the physical properties of: Magnetism.

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Separating Mixtures http://www.youtube.com/watch?v=jWdu_RVy5_A The components of a mixture can be separated based on the physical properties of: Magnetism Density An instrument that uses this property to separate mixtures when tiny solid particles are dissolved in a liquid is called a centrifuge. Some techniques used to separate the components of a mixture are: Filtration used to separate liquids from solids Evaporation or distillation used to separate solutions Episode 203

Density Mass per unit volume Density = mass/volume Per means “divide” Density = mass/volume Common units for density: g/mL g/cm3 Episode 203

Suppose we have an object with a mass of 5. 0 grams ans a volume of 2 Suppose we have an object with a mass of 5.0 grams ans a volume of 2.0 mL. What would the density of this object? 5.0 grams 2.0 mL 2.5 grams/mL Episode 203

Problem Set One Given a mass of 12 g and a volume of 3 mL, calculate the density. What is the mass of 50 mL of water? (Density of water is 1 g/mL) Given that the density of iron is 7.9 g/cm3, what would be the volume of a 15.8 g piece of iron? 12 grams = 4 grams/mL 3 mL m = Dv 1 g/mL x 50 mL = 50 grams 15.8 grams v = m/D = 2.0 cm3 7.9 g/cm3 Episode 203

Problem Set Two Find the density of a block with a length of 4.0 cm, a width of 3.0 cm, a height of 2.0 cm, and a mass of 36 grams. Find the density of an 8.0 g rock if the water in a graduated cylinder rises from 20.0 mL to 23.5 mL when the rock is placed into the cylinder. You have a piece of silver with a mass of 31.5 g. Silver has a density of 10.5 g/cm3. What would be the new level of water if this piece of silver is placed into 15 mL of water? 36 grams = 1.5 grams/cm3 4.0cm x 3.0cm x 2.0 cm 8.0 grams = 2.3 grams/mL 23.5mL – 20.0mL 31.5 grams v = m/D = 3.00 cm3 or 3.00 mL 10.5 g/cm3 15 mL + 3.0 mL = 18mL Episode 203