MaterialsThermometer (supplied)Jar, large enough for thermometer to fit in, with lid (student supplied)Small plastic or glass container (student supplied)Vinegar (student supplied)Steel wool (student supplied)Gloves to protect hands while working with steel wool (student-supplied)ProcedureNote: If you did not do so at the beginning of this lesson (as directed) begin by setting all the materials out for at least 20 minutes to adjust to room temperature (overnight if the vinegar has been refrigerated).Place the thermometer in the jar and close the lid. Wait five minutes for the thermometer to adjust to the temperature. Open the lid and record the temperature.In the other container, soak a small piece of the steel wool in the vinegar for about one minute. Separate the steel wool so that vinegar can reach all the filaments. The vinegar needs to be at room temperature.Squeeze the excess vinegar from the steel wool.Wrap the steel wool around the thermometer and place both in the jar (you can use a rubber band). Close the lid.After five minutes open the lid and record the temperature.Note: Be sure that the vinegar and all other materials are at room temperature as directed. Record temperature changes carefully and accurately, because the change in temperature will be small.AnalysisCopy and paste these questions into a Word document, and save it as an .rtf file. You will submit these questions as the assessment to this lesson.What was the initial temperature in the jar?What was the temperature after the reaction?What was the change in temperature?Based on information from Part I and from observations, was this reaction Exothermic or Endothermic?Are chemical bonds forming or breaking?In this experiment, the acidic vinegar dissolved a protective coating off the steel wool, allowing the oxidation of the steel to begin. This process is called rusting. In this reaction, iron is combined with oxygen gas to form iron oxide. Hint: An iron (III) product is formed.
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