Presentation on theme: "Oxidation of Iron - An example of a Combination Reaction"— Presentation transcript:
1 Oxidation of Iron - An example of a Combination Reaction Vanderbilt Student Volunteers for ScienceTraining PresentationSpring 2010
2 IntroductionOxidation: Oxidation usually occurs when an element or compound combines with oxygen.Apples turn brown after they have been cut and left exposed to the air.Iron is oxidizing when it rusts and turns a reddish colorThis example of rusting is called a combination reactionRust = iron oxide
3 Part 1: Rusting of Iron Filings Put cotton ball into a 1oz cup and sprinkle with iron filings.Sprinkle a small scoop of saltAdd a squirt of Hydrogen PeroxideSet aside and observe after starting part 2.*the obvious orange color forms within 2 minutes
4 Part 2: Steel Wool Put steel wool into plastic bag Put plastic bag into cup (line it like a garbage can)Add a spoonful of salt and the rest of the peroxide.Feel the bag and note the temperature (Should be at room temperature)Measure the temperature again in 1 minuteSteel wool pieceLine like a garbage can
5 Looking back at Part 1 Look back at the iron filings. Equation: 4Fe + 3O2 2Fe2O3Before: no rustAfter: orange color
6 Return to Part 2.Measure the temperature of the steel wool in the plastic bag now.NOTE: Now at 90 degrees.
7 Conclusion The reaction in this experiment was a COMBINATION REACTION The temperature of the iron filings plus peroxide plus salt mixture increases, so the reaction is EXOTHERMIC.
8 Clean Up Wipe thermometers and bring them back. Seal plastic bags and throw away in trash can.If the school does not want you to put it in their trash, put all the bags in a larger bag and bring back to the VSVS lab.