WALT – Explain how to calculate density

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Presentation transcript:

WALT – Explain how to calculate density Q) Which weighs more:- A kilogram of feathers or a kilogram of iron? DENSITY WALT – Explain how to calculate density

Density is the Mass per unit Volume What is Density? If you take the same volume of different substances, then they will weigh different amounts. Wood Water Iron 1 cm3 1 cm3 1 cm3 IRON 0.50 g 1.00 g 8.00 g Q) Which has the greatest mass and therefore the most dense? Density is the Mass per unit Volume

Density Equation: = m V m V  Mass Density = Volume Example: g or kg m V  Mass Density = Volume gcm-3 or kgm-3 cm3 or kg3 = m V Example: Q) Liquid water has a density of 1000kgm-3, while ice has density of 920kgm-3. Calculate the volume occupied by 0.25kg of each. V = m = 0.25 = 0.000250m3  1000 V = m = 0.25 = 0.000272m3  920

DENSITY OF A REGULAR SOLID 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. m = 240 g 2.0 cm  = m = 240 =10.0 g/cm3 V 24 3.0 cm 4.0 cm

Material Mass in g Length in cm Width Height Volume in cm3 Density in g/cm3

DENSITY g/cm3 Aluminium 2.70 Iron 7.86 Brass 8.50 Wood 0.50 Slate 2.80 Glass 2.50 Lead 11.3 Marble 2.70 Wax 0.89

DENSITY 2 WALT- Measuring the DENSITY OF AN IRREGULAR SOLID

DENSITY OF AN IRREGULAR SOLID m = 360 g  = 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. 80 cm3 50 cm3

DENSITY OF AN IRREGULAR SOLID OR use a Eureka Can to find the Volume. Find the mass of the solid on 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 m = 440 g 40.0 cm3  = m = 440 =11.0 g/cm3 V 40

DENSITY g/cm3 Aluminium 2.70 Iron 7.86 Brass 8.50 Wood 0.50 Slate 2.90 Glass 2.50

DENSITY OF A LIQUID Find the Mass of an empty Measuring Cylinder. Mass of Liquid = Mass of Measuring Cylinder and Liquid – Mass of empty Measuring Cylinder DENSITY OF A LIQUID 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. 45.0 g 25.0 g 20.0 cm3 45 – 25 = 20 g  = m = 20 =1.00 g/cm3 V 20

Mass of empty Measuring Cylinder Liquid Mass of empty Measuring Cylinder in g Mass of Measuring Cylinder and Liquid Mass of Liquid Volume in cm3 Density in g/cm3

DENSITY OF A GAS 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. To vacuum flask 150.0 g 170.0 g 1000 cm3 170 -150 = 20.0g  = m = 20 =0.0200 g/cm3 V 1000