Predict the products and write a balance equation for each of the following: a) Decomposition: NaCl(s)--->____+____ (above the arrow it says "electricity"); b) Combination:Ca(s)+Br2(g)-->_____; c) Combination:SO2(g)+O2(g)-->______; d) Double replacement:NiCl2(aq)+NaOH(aq)-->