By Cynthia Light Brown, Blair D Shedd
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Extra resources for Amazing Kitchen Chemistry Projects You Can Build Yourself (Build It Yourself series)
They sent their Nobel Prize medals, which were gold, to another Nobel Prize winner, Niels Bohr, in Copenhagen, Denmark. When the Nazis invaded Denmark in 1940, Niels wanted to protect the medals. But how? He didn’t want to bury them because they could always be found and dug up. The Nazis made sending gold out of the country illegal, and the medals had the names of the Nobel Prize winners on them, so if they were discovered, James and Max would be imprisoned, or worse. A scientist named George de Hevesy helped solved the problem.
6_\[ 1 2 Put one cup of cereal in the bowl. Mash the cereal with the spoon. Add water to cover the cereal and continue mashing until the cereal is mushy. Swish the magnet through the cereal, especially along the bottom of the bowl. The longer you swish the magnet, the more iron you will collect. SuppLies Z AQD@JE@RS BDQD@K ENQSHEHDC VHSG HQNM Z ANVK Z RONNM Z V@SDQ Z L@FMDS 3 Try variations in the experiment to see how you can get the most iron out of the cereal. What happens if you don’t mash up the cereal ﬁrst?
High temperatures make molecules move faster, so they’ll be more likely to bump into each other. Another factor is the size of the particles of reactants. Powders, for example, will react faster than a big hunk of a reactant. That’s because powders have a much larger surface area, which means there’s more area that can come into contact with the other reactants. Have you ever stirred something before baking it? You’re helping to mix together the molecules, which makes the reaction go faster. ZNgV[T
=_\WRPa` HOT AND HOTTER Some reactions are extremely exothermic; they produce a lot of energy.