DENSITY

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

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

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. ...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online