hahzhza hahzhza 03-01-2018 Chemistry contestada Please help! Worth 20 points For each reaction below, write the balanced equation. 1.FeS2+O2—>Fe2O3+SO2 2.AI+O2—>AIO2 3.K+Br2- ->KBr 4.SiO2+HF—>SiF4+H2O