Question

An IGCSE student thinks it may be possible to identify different rocks (A, B and C) by measuring their

densities. She uses an electronic balance to measure the mass of each sample and uses the displacement
method to determine the volume of each sample.

Answer 1

See the answer below

Step-by-step explanation:

a. The volume in the first measuring cylinder reads 70
`cm^3` while that of the second reads 95
`cm^3`. Hence;

V1 = 70
`cm^3`

V2 = 95
`cm^3`

b. An object will always displace its own volume in a liquid. Hence:

Volume V of the rock sample = V2 - V1

= 95 - 70 = 25
`cm^3`

c. Mass of A = 102 g

Volume of A = 25
`cm^3`

Density = mass/volume

Hence, density of A = 102/25 = 4.08 g/
`cm^3`