Solid
A miner finds a sample of rock and is convinced it contains
gold. He looks up the density of gold and discovers gold has a density
19 g/cm^3, whilst ‘fool gold’ has a density of 5 g/cm^3. The mass of
his sample is 5.5kg and the volume of water is displaced by
it's 300cm3.
a)
Calculate the density of the sample in g/cm^3.

How is electrolysis most commonly used to produce an energy source? a - splitting water molecules produces oxygen, which organisms breathe to fuel their bodies. b - splitting water molecules produces hydrogen gas, which is used to power machines through hydrogen fuel cells. c - splitting carbon dioxide molecules produces coal, a form of carbon that can be burned to produce heat. d - splitting carbon dioxide molecules produces natural gas, which can be burned to generate electricity in power plants.