Electrolysis of copper sulfate. we used copper electrodes. if we used electrodes from a different material eg. zinc, would that affect the end result? yes/ no and why?
, i have no idea what is going on

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams

Ineed to find the answer of this question because i dont understand it

What is the oxidation state of each individual carbon atom in c2o42−?