oxidation is a chemical reaction that occurs when oxygen combines with an element or compound. for instance, when raw apple slices are exporsed to air, certain chemicals on the surface of the slices oxidize and turn brown. antioxidants arew substances that slow the rate of oxidation. citrus fruits, for example, contain the antiox idant vitamin c. suppose fresh apple slices are dipped briefly in lemon juice and then placed in a bowl. how will the lemon juice affect the apple slices?