Give two examples of
energy conversion.

Ibelieve y y even though i've only taken chemistry for one year

Idont know. if you want an answer you need to give us some context dude.

(no3)⁻n has oxidation number x,o has oxidation number -2.(x*1 -2*3) charge of the nitrate ion, and we know that charge of the nitrate ion =-1.so,(x*1 -2*3) =-1x-6=-1x=+5answer a. +5.

This is a solution, hope i could