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.

See the answer below

Explanation:

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

V1 = 70  

V2 = 95  

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

Volume V of the rock sample = V2 - V1

   = 95 - 70 = 25  

c. Mass of A = 102 g

   Volume of A = 25  

Density = mass/volume

Hence, density of A = 102/25 = 4.08 g/

a. carbon monoxide from car exhaust

b.particulate matter, such as soot

c.water vapor from a factory smokestack

d.acid rain

these are the answer choices im on that question right now