"Many of the transition metals (orange) can have more than one charge. The notable exceptions are zinc (always +2), silver (always +1) and cadmium (always +2)." If some have set/constant ionic charges do they need roman numerals?

and my follow up question,
is it always necessary to use the Roman numeral as the assigned charge of the transition metal?(if so, why? why? do roman numeral need to be added to silver etc. if they already have set charges?)

If i can still dissolve more sugar into the solution at a certain temperature what would i call that solution

What is the percentage of hydrogen in c2h4

In vapor-liquid equilibrium in a binary mixture, both components are generally present in both phases. how many degrees of freedom are there for such a system? the reaction between nitrogen and hydrogen to form ammonia occurs in the gas phase. how many degrees of freedom are there for this system? steam and coal react at high temperatures to form hydrogen, carbon monoxide, carbon dioxide, and methane. the following reactions have been suggested as being involved in the chemical transformation: