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Density Worksheet Density measures how much mass there is in 1cm3 of something. Density can be calculated using the equation - Density = mass Volume Method1. Measure the mass of a piece of object in grams. 2. Note the level of the water before and after the object is added. 3. Work out the volume of the object by using the calculation – Volume of water before object added – volume of water after object added. 4. Work out the density in g/cm 3 of object. Results tableObject Mass (g) Volume of water before object added (cm3) Volume of water after object added (cm3) Volume of object (cm3) Density of object (g/cm3) 1 2 3 Questions- Part A Circle the correct option. 1. Density is how much (mass / volume) there is in 1cm3 of a material. 2. A material with a high density feels (lighter / heavier) than a material with a low density if you have the same volume of each. 3. The density of water is 1g/cm3. If a material has a density (less / greater) than the density of water, it will float. 4. Object A has a mass of 500 g and a density of 5.0 g/cm3. Object B has a mass of 650 g and a density of 6.5 g/cm3. Which object would displace the most liquid? A or B (show work below) Volume = how much liquid is displaced. Find volume of each obj. Obj. A: Volume = mass ÷ density Obj. B: Volume = mass ÷ density V = (500g) ÷ (5.0 g/cm3) V = (650g) ÷ (6.5 g/cm3) 3 V = 100 cm V = 100 cm3 Both objects A and B have the same volume so they displace the same amount of liquid. Answer = Both A & B displace the same amount of liquid Questions- Part B 1. A (rectangular prism shaped) piece of wood that measures 3.0 cm by 6.0 cm by 4.0 cm has a mass of 80.0 grams. What is the density of the wood? Would the piece of wood float in water? (volume = L x W x H) Volume of a rectangular prism= length x width x height V = 3.0 cm x 6.0 cm x 4.0 cm V = 72 cm3 Density of the piece of wood = mass ÷ volume D = 80.0 g ÷ 72 cm3 D = 1.1 g/cm3 Will it float in water? No, because the wood is more dense than water it will sink. 2. I threw a plastic ball in the pool for my dog to fetch. The mass of the ball was 125 grams. What must the volume be to have a density of 0.500 g/mL. ( I want it to float of course!) Find the volume of the ball: volume = mass ÷ density V = 125 g ÷ 0.500 g/ml V = 250 ml or 250 cm3 3. A gold coloured necklace was measured to have a mass 425 grams. By water displacement, the volume of the beads was calculated to be 48.0 cm3. Given the following densities, identify the metal. Gold: 19.3 g/mL Copper: 8.86 g/mL Bronze: 9.87 g/mL Find the density of the necklace material: The metal is most likely copper. 8.85 g/ml ~ 8.86 g/ml Density = mass ÷ volume D = 425g ÷ 48 cm3 D = 8.85 g/cm3 or 8.85 g/ml 4. Gasoline is a non-polar liquid that will float on water. 450 grams of gasoline is spilled into a puddle of water. If the density of gasoline is 0.665 g/mL, what volume of gasoline is spilled? Find volume: Volume = mass ÷ density V= 450g ÷ 0.665 g/ml V= 677 ml 5. A metal bolt with a mass of 158.13g is dropped into a graduated cylinder containing 34.8 cm³ of water. The new volume reads 41.8 cm³. Identify the metal. Find volume of bolt by subtracting starting volume from final volume. V = 41.8 cm3 – 34.8 cm3 V = 7 cm3 Find the density to identify the metal: Density = mass ÷ volume D = 158.13 g ÷ 7 cm3 D = 22.59 g/cm3 According to my pure metals denstity list, the metal is most likely osmium