Theres this question in oct/nov 04 Q11, that says:
' A substance X is heated in an evaporating basin until there is no further change.
mass of basin
before heating 25.52g
after heating 26.63g
What could X be?
A copper
B copper (II) carbonate
C Copper (II) oxide
D Hydrated copper (II) sulphate'
ms says the answer is A, i dunt get it, i thought substances decrease in size or breakdown when heated