What is the minimum voltage required to separate molten potassium bromide into its elements as potassium metal and bromine liquid?

In numbering carbon atoms in the parent chain of a hydrocarbon, why would you number from right to left, rather than left to right

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

Answer explain why it is not possible to deduce a complete order of reactivity.