Neco 2017 Physics Question 1

A student is required to determine the density of an unknown metal sample using the water displacement method and a digital balance. The procedure is as follows: 1. Measure the mass of the dry metal sample using a digital balance (recorded to the nearest 0.01 g). 2. Fill a graduated cylinder with water and record the initial volume. 3. Gently place the metal sample into the cylinder and record the new volume. 4. Calculate the volume of the metal from the change in water level. 5. Using the mass and volume, calculate the density of the metal. 6. Compare the obtained density with the standard densities in the table below and identify the metal. Standard densities (g cm⁻³): - Aluminium: 2.70 - Iron: 7.87 - Brass: 8.50 - Copper: 8.96 - Zinc: 7.14 The recorded data are: - Mass of metal = 56.20 g - Initial water volume = 120.0 cm³ - Final water volume = 127.0 cm³