Oxidation: How Can It Be Proved?

Henderson, Connie Eli Whitney Elem. School

OBJECTIVES 1. Students will learn basics facts of oxidation. 2. Students will participate in some phenomenological activities illustrating oxidation. 3. Students will be able to understand oxidation reduction reaction. Materials needed 1 tall glass cotton ball 1/2 ball of steel wool(composed of iron) glass container a small bowl filled with water matches paper towels vinegar bleach potassium hydroxide dextrose methylene blue Recommended Strategies Run water over the steel wool until it is thoroughly soaked, then squeeze the water from it. Pull out the steel wool so that it is fluffy instead of firmly packed, then put it in the glass. It should occupy about half of the space. Invert the glass, making sure the steel wool does not slip from the top half of of the inverted glass. Stand the glass in the bowl. Fill the bowl halfway with water. No water should enter the glass. Let the glass stand undisturbed in the bowl for 48 hours. How much of the glass is filled with the water now? Remove the steel wool and dry it off with the paper towels. What comes off on the towels? Put two small steel wool balls of equal size in two glasses. Cover the balls with equal amounts of water. To one glass add a tablespoon of vinegar. To the other glass add a tablespoon of vinegar and one of bleach. After half an hour, the steel wool in the glass without bleach is unchanged, while the ball in the glass with the bleach is rusted. Weigh 8 grams of potassium hydroxide and 10 grams of dextrose. Put these two things into a 300 mL glass container with a few drops of methylene blue. Shake the container vigorously and note blue solution. Wait a few minutes and note the solution turns clear. Ask questions about the chemical reaction. Put a cotton ball in a container and use matches to ignite the cotton ball. What happened? Was there a chemical reaction? If so, explain.
Return to Chemistry Index