DENSITY - Q) Which weighs more:­ A kilogram of feathers or...

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Unformatted text preview: Q) Which weighs more:­ A kilogram of feathers or a kilogram of iron? DENSITY GEL2007 What is Density? What If you take the same volume of different substances, then they will weigh different amounts. Wood Water Iron 1 cm3 1 cm3 1 cm3 0.50 g 1.00 g 8.00 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 = Mass Volume m gcm­3 or kgm­3 cm3 or kg3 ρ = m V V = m = 0.25 = 0.000250m3 ρ 1000 V = m = 0.25 = 0.000272m3 ρ 920 Example: ρ V Q) Liquid water has a density of 1000kgm­3, while ice has density of 920kgm­3. Calculate the volume occupied by 0.25kg of each. 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 Length Width Height Volume Density in g in cm in cm in cm in cm3 in g/cm3 DENSITY DENSITY Aluminium g/cm3 2.70 Iron 7.86 Brass 8.50 Wood Slate 0.50 2.80 Glass 2.50 Lead Marble Wax 11.3 2.70 0.89 DENSITY OF AN IRREGULAR SOLID SOLID m = 360 g 80 cm3 50 cm3 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. DENSITY OF AN IRREGULAR SOLID SOLID OR use a Eureka Can to find the Volume. Find the mass of the solid on 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 g/cm3 Aluminium 2.70 Iron 7.86 Brass 8.50 Wood 0.50 Slate 2.90 Glass 2.50 Mass of Liquid = Mass of Measuring Cylinder and Liquid – Mass of DENSITY OF A LIQUID DENSITY empty Measuring Cylinder 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 Mass of Measuring Cylinder and Liquid in g in g Mass of Liquid in g Volume Density in cm3 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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