By Steve Tomecek
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Fill one of the plastic cups about half full with water and add 1 teaspoon (5 ml) of dishwashing liquid. stir the mixture until it produces bubbles. Place two pennies in the cup and allow them to soak undisturbed for 10 minutes. 3. Fill the second cup half full with lemon juice and add 1 teaspoon (5ml) of salt. stir the mixture until the salt dissolves. Place the last two pennies in the cup with the lemon juice and allow them to soak undisturbed for 10 minutes. 4. remove the two pennies from the cup with the dishwashing liquid and rinse them with water.
The aluminum can, penny, and quarter all should have shown no attraction to the magnet. 3. The painted steel still should have been attracted to the magnet. 4. The stainless-steel items will show varying degrees of attraction to a magnet, ranging from a strong attraction to none at all. 5. The materials that you selected will have varying degrees of magnetism depending on what they are made of. indd 56 9/29/10 10:47 AM Magnificent Metalsâ•… 57 Tarnish, Corrosion, and Rust Over time, items made from metal tend to change when they are exposed to water and air.
As you stir, add water to the mixture a few drops at a time. the solids should start to liquefy. Continue stirring and adding water until the entire mixture is a thick liquid. the glue is now ready to test. indd 30 9/29/10 10:47 AM Building a Better World 31 4. dip the tip of your pointer finger in the glue mixture. touch it to your thumb and observe how it feels. Wash your fingers and then use the mixture to glue the two tongue depressors together. also use it to glue the index card to the piece of paper, the two pennies together, and the bottom of the plastic cup to the plastic plate.