Presentation on theme: "CORROSION. Corrosion is a chemical change, in which a metal loses its properties because of a chemical reaction with its environment. Corrosion is a very."— Presentation transcript:
Corrosion is a chemical change, in which a metal loses its properties because of a chemical reaction with its environment. Corrosion is a very slow process, can take decades depending on the metal involved. Corrosion looks different for different types of metals.
IRON (Rusting) The corrosion of iron-based metals is called RUSTING Iron reacts with oxygen to form IRON OXIDE The oxygen can come from AIR or WATER
Silver does not rust, but tarnishes very slowly. Silver reacts with hydrogen sulfide found in food or water In this reaction, silver turns into silver sulfide. Silver Sulfide: Called “tarnish” A blue/black colour
Spoon made of silver SILVER SPOON COVERED IN SILVER SULFIDE (TARNISH)
SILVER Let’s make silver tarnish quickly! Materials 1 piece of silver material 2 hard boiled eggs (only the yolk) 1 zip lock bag Procedure Boil eggs, remove egg yolks Place in ziplock bag, overnight in freezer