Subject: Science, Topic: Density. Would you mind helping me answer questions 1-5 from the pink box please? This is other than General Physics If you can't find the answers, you may research. Thank you for your help.

13 Density Table 13.1 The density of some common solid materials 1 Arrange the materials in Table 13.1 in order of density, Material Density/kg/m starting with the least dense ice 920 material. 2 Which is heavier, 1 m3 of steel cork 250 or 1 m' of aluminium? wood 350 The density of some common materials 3 Which is heavier, 1 kg of steel steel 7900 Measuring the density of a rectangular block or 1 kg of cork? Measuring the density of a liquid aluminium 2700 The density of gases copper 8 940 lead 11 350 Which is heavier - the wood in the trunk of a tree or the gold 19320 metal in a coin? Your first answer might be to say the trunk polythene 920 of the tree, but it can float on water while a coin would quickly sink to the bottom. perspex 200 To be a fair comparison we need to find the masses of expanded polystyrene 15 equal volumes. If we found the mass of a piece of wood the size of a coin we would see it was lighter. Measuring the density of a rectangular solid block Comparing densities The mass of the block is found by placing the block on a The density of a substance is a measure of the amount balance (check the balance reads zero first) and reading of matter that is present in a certain volume of it. The the scale. The mass in grams is recorded. The volume is following equation shows how the density of a substance found by multiplying the length, width and height of the block together and recording the value in centimetres Figure 13.1 Timber can be transported can be calculated: cubed. The density of the material in the block is found by by water because wood is less dense than density = mass dividing the mass by the volume and expressing the water, so It floats at the surface. volume 4 A block of material Is 8 cm long, quantity in the unit g/cm'. The basic SI unit of density is found by dividing the unit of mass by the unit of volume, so it is kg/m'. This 2cm wide and 3 cm high, and is pronounced 'kilograms per metre cubed'. Table 13.1 has a mass of 46g. What is its width length shows the densities of some solid materials. density? In the school laboratory, when small amounts of 5 a) Convert the value you found materials are used, the density of a substance is often for the density in question 4 height calculated using masses measured in grams and volumes to kg/m3 . in centimetres cubed, giving a density value in g/cm'. b) Compare the density of the The density value in units of g/cm' can be converted to a material in the block with value in kg/m' by multiplying it by 1000. For example, ice those in Table 13.1. Which was found to have a density of 0.920 g/cm', This can also materials in the table have 200.009 be expressed as 0.920 x 1000 = 920 kg/m'. densities closest to that of the block ? c) How could you convert the value of a density given in kg/m' to g/cm*? Figure 13.2 Finding the mass of a block using a top-pan balance 171