Find out density of metal

Method: Determine the density of the metal blocks by measuring the mass and volume of the blocks, using the formula: Density= Mass/Volume

1. Obtain the metal block assigned

1. Mearsure the mass using the electronic balance
2. Partially fill the graduated cylinder with water and read the initial volume
3. Tip the graduated cylinder and slowly slide the metal block
4. Place the cylinder neatly on the table again and measure the final volume
5. Repeat with the remaining metal blocks

Data collection and processing

• Table 1: Mass (g) of the metal blocks – initial and final volume (ml) of the cylinder

• 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

• Average mass ±0.01(g) = 

Ex: Average mass of Zn = 108.98 ±0.01(g)

Average volume ± 4 (ml) =

        Ex : Average volume of Pb =  15  4(ml)

Table 3: Average mass and volume of the blocks

• D (g/ml)=

Ex: DZn== 7 ± 2 (g/ml)

Table 4: Density of the metal blocks

Conclusion: The densities of metals obtained are different from those hypothesised. Some metals have densities that are quite similar to the hypothesis: Zn ( % of difference is 1.4%) 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