Presentation on theme: "Does Rust Affect Metal’s Strength?"— Presentation transcript:
1 Does Rust Affect Metal’s Strength? Carolyn RiegelGrade Nine
2 ProblemWhat solution will cause the most rust, thus resulting in the weakest metal?
3 ResearchRust, occurs when certain metals are exposed to oxygen and waterThe water that hits the surface of the metal will form with carbon dioxide to become acidThe rest of the water will separate into its two elements, hydrogen and oxygen. Oxygen will combine with the acid to create iron oxideWhen regular water is used in the rust process it forms an acidic solution that acts as a catalyst. If sodium chloride is used, no solution is needed because it is already a catalyst.Sodium hypochlorite is a potent oxidizer and readily accepts electrons from the metal
4 HypothesisIf steel wool is soaked in three different solutions, the sodium chloride solution will cause the steel wool to require the least amount force to rip apart.
5 Materials 9 beakers 12 pieces of steel wool ( about .75 grams each) Distilled water ( 100 milliliters in three beakers)10% sodium chloride concentration with distilled water in three beakers10% sodium hypochlorite concentration with distilled water in three beakersForce Logger Pro SoftwareComputer
6 Procedure Each steel wool piece was cut Beakers were filled with different solutionsSteel wool placed in each respective beakerAfter 3 days, steel wool was removed from beakers and allowed to dry offForce Logger Pro was used to test the force needed to rip the steel woolData was recordedIndependent variable: solution steel wool is placed inDependent Variable: durability of the steel woolConstants: type of steel wool, time steel wool was in solution, temperature of roomControl: steel wool placed in distilled water solution, steel wool not placed in any solution
8 ConclusionHypothesis : If steel wool is soaked in three different solutions, the sodium chloride solution will cause the steel wool to require the least amount force to rip apart.Hypothesis supported based on my results
9 Works CitedNetrekker. N.p., n.d. Web. 13 Dec <http://school.nettrekker.com/ goPage?np=/home.ftl>."Rust." Science Online. N.p., n.d. Web. 11 Dec <http://www.fofweb.com/ Science/default.asp>.Salt and Oxidation." Student Resource Center. N.p., n.d. Web. 17 Dec