1)which of the following substances does not have a heat of formation equal to zero at standard conditions?
I am stuck between C and D , I know that in standard conditions Bromine is Liquid and Iodine is solid not gas so both C and D should have a non zero heat of formation, but only one answer is correct, how can you eliminate one aswer ??
2)which is the weakest electrolyte?
the correct ansr is D but it also says in the explanation "All ionic compounds, whether soluble or not, are defined as strong electrolytes so choices A,B,C are eliminated.
it's this explanation that confuses me AgBr is insoluble, how can it be a strong electrolye?? electrolyts must produce ions in aquous solution and conduct electricity, without being soluble you can't produce ions or conduct electricity, why do they still call insoluble ionic compounds strong electrolytes???
please help thanks