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# p40 - Q Which weighs more:­ A kilogram of feathers or a...

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Unformatted text preview: Q) Which weighs more:­ A kilogram of feathers or a kilogram of iron? DENSITY DENSITY GEL2007 If you take the same volume of different substances, then they will weigh different amounts. Wood Water Iron 1 cm3 8.00 g What is Density? What 1 cm3 0.50 g 1 cm3 1.00 g IRON Q) Which has the greatest mass and therefore the most dense? Density is the Mass per unit Volume Density Equation: g or kg Density = gcm­3 or kgm­3 Mass Volume cm3 or kg3 m ρ V ρ = m V V = m = 0.25 = 0.000250m3 ρ 1000 V = m = 0.25 = 0.000272m3 ρ 920 Example: Q) Liquid water has a density of DENSITY OF A REGULAR SOLID DENSITY m = 240 g 2.0 cm ρ = m = 240 =10.0 g/cm3 3.0 cm V 24 4.0 cm Find the Mass of the solid on a balance. Measure the three lengths and calculate the Volume. (ie V = l x w x h ) Calculate the Density. Material Material Mass in g Length in cm Width in cm Height in cm Volume in cm3 Density in g/cm3 Aluminium Iron Brass Wood Slate Glass Lead Marble Wax DENSITY DENSITY 3 g/cm 7.86 8.50 0.50 2.80 2.50 11.3 2.70 0.89 2.70 m = 360 g DENSITY OF AN IRREGULAR SOLID SOLID 80 cm 50 cm ρ = m = 360 =12.0 g/cm3 V 30 Find the Mass of the solid on a balance. Fill the Measuring Cylinder with Water to a known Volume. Add the Object. Work out the Volume of Water that is displaced. Calculate the Density. OR use a Eureka Can to find the Volume. Find the mass of the solid on DENSITY OF AN IRREGULAR SOLID SOLID m = 440 g 40.0 cm3 ρ = m = 440 =11.0 g/cm3 V 40 a balance. Add water until just overflowing. Place a Measuring Cylinder under the spout. Add the Object. Collect the Water and read off the Volume. Calculate Density DENSITY DENSITY Aluminium Iron Brass Wood Slate Glass 2.70 7.86 8.50 0.50 2.90 2.50 3 g/cm Mass of Liquid = Mass of Measuring Cylinder and Liquid – Mass of empty Measuring Cylinder DENSITY OF A LIQUID DENSITY 45.0 g 25.0 g 20.0 cm3 45 – 25 = 20 g Find the Mass of an empty Measuring Cylinder. Add a certain Volume of Liquid. Find the Mass of the Measuring Cylinder and Liquid Calculate the Mass of Liquid. How? Calculate Density of Liquid. ρ = m = 20 =1.00 g/cm3 V 20 Liquid Liquid Mass of empty Measuring Cylinder in g Mass of Measuring Cylinder and Liquid in g Mass of Liquid in g Volume in cm3 Density in g/cm3 DENSITY OF A GAS DENSITY To vacuum flask 150.0 g 170.0 g 1000 cm3 170 ­150 = 20.0g ρ = m = 20 =0.0200 g/cm3 V 1000 Remove the air from a flask of a known Volume, using a vacuum pump. Find its Mass. Add the gas to be tested. Reweigh. The difference is the Mass of gas. Calculate Density. ...
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