text: Cu+2 + 2e- ===> Cu\n\nReduction is the gain of electrons. Copper cations gained electrons to be reduced to copper metal. Oxidation is the loss of electrons. Iron metal lost electrons to become ferrous chloride.\n\nNext time, have the teacher do the experiment with gelatin in a pie plate with Na+Cl- dissolved. Add phenolphthalein to the gel for some reactions. Add potassium ferrocyanide to the gel for others.