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Find out density of metal

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Date: 6/8/2009 DENSITY OF METALS Aim: To investigate the density of different kinds of metal or an alloy of metals Hypothesis: DZn = 7.1 g/ml, DPb = 11.3 g/ml, DCu = 8.9 g/ml, DFe = 7.8 g/ml, DAl = 2.7 g/ml, DBrass 8.5 g/ml ( Source: http://www.simetric.co.uk/si_metals.htm) Variables: i. Independent variables: 2 sets of blocks of diferrent kinds of metal ( Zinc-Zn, Lead-Pb, Copper-Cu, Iron-Fe, Aluminium-Al) and an alloy between copper and zinc (Brass). ii. Dependent variables: mass, volume of the blocks iii. Constant: the same electronic balance 0.01g, the same graduated cylinder 250ml 2ml, water, room temperature Method: Determine the density of the metal blocks by measuring the mass and volume of the blocks, using the formula: Density= Mass/Volume 1. ...read more.


65 65 65 65 65 65 Run 2 Mass (�0.01g) 108.38 178.80 144.06 125.32 42.25 137.47 Initial volume (�2ml) 150 150 150 150 150 150 Final volume (�2ml) 165 165 165 165 165 165 Observation Bluish pale grey Bluish gray Reddish/ Orange metallic lustre Lustrous silver - grey Grey Silvery yellow * Volume of the block � 4 (ml) = final volume 2 (ml) - initial volume 2 (ml) Ex: Volume of Fe block (Run 1) = (65 2) - (50 2) =15 4(ml) Table 2: Volume of the blocks Zn Pb Cu Fe Al Brass Volume (� 4 ml) Run 1 15 15 15 15 15 15 Run 2 15 15 15 15 15 15 * Average mass �0.01(g) ...read more.


and Fe (% of difference is 2.6% ). However, densities of the other metals are different from the hypothesis: Pb ( % of difference is 11.5%), Cu(% of difference is 12.4%), Al ( % of difference is 11.1%) and Brass (5.9% different from the hypothesis). Evaluation Limitations Effects Improvements Uncertainty of the cylinder is too large (Systematic error) The volumes obtained are not accurate Use a smaller cylinder (100ml) with smaller uncertainty The metal blocks are not pure (Systematic error) The mass obtained is not accurate ( it may get lighter) Use pure metal blocks The number of experiments carried out is not enough (Random error) Figures of mass and volumes read may not be accurate Do the experiment many times ?? ?? ?? ?? ...read more.

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