•H2 = HBr = KBr = AgBr
1) H₂ + Br₂ = 2HBr 2) 2HBr + 2K = 2KBr + H₂↑ 3) KBr + AgOH = AgBr↓ + KOH
H2+Br2=2HBr HBr+KCL=KBr+HCL KBr+AgNO3=KNO3+AgBr