Density of an alloy Watch
It's a 4 mark question and I don't get what values for masses and volume I should be putting in.
Are you sure that the question contains no information about the proportion of the metals in the alloy?
Density of copper is 9 g/cm^3
Density of zinc is 7 g/cm^3
What is the density of the alloy?"
So for both elements, divide the mass by the density to obtain the volume of each. Adding these volumes will give you the total volume of the alloy. Then divide the sum of the masses by this total volume to obtain the density of the alloy (I think)