有關bromine

1. Molten lead (II) bromide既products 的確係lead 同bromine, 但因為電解佢地出來既環境太高溫, 所以bromine會boil 左變成gas. Bromine 係simple molecular structure, 所以boiling point 幾低下.( 唔知你學左未, 未學既話試d 會教的)

2. Bromine 本身係liquid, 係formula 到我地會寫成Br2(l) 以表示佢既state 係liquid.
Aqueous 係指溶左落水, 當佢dissolve 左係water 既時候就可以話佢係aqueous solution, 係formula 到會寫成Br2(aq) 以表示佢溶左落水. 但要小心, 只係溶左落水先可以係(aq), 所以dissolve in organic solvent 唔係aqueous, 好似佢dissolve 係alcohol 我地應該寫成Br2(alcohol) 咁樣, 但Br2(alcohol) d 咁既野CE level 係唔使理的~

當一樣野既temperature低過melting point, 佢地state 就係solid; 當一樣野既temperature高過melting point, 自己就係liquid; 而temperature高過boiling point 呢, 就會係gas la. 有一d 野係幾特別的, 就係boiling point 低過melting point, 所以個d 野會由solid 直接變成gas, 就係昇華(sublimation), 好似iodine 就係la

As in the molten state mean it is in the high temperature, so the bromine liquid evaporate at this high temperature.