Using the gain or loss of electron identify which substance is undergoing oxidation and reduction by writing both oxidation and reduction half equations.
you can state/identify which substance has been oxidized or reduced.
1. Bromine + potassium iodide → potassium bromide + iodine
2. Iron (iii)oxide + carbon → iron + carbon dioxide
3. Ammonia + copper(ii)oxide → copper + water + nitrogen

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.