One of the best ways to teach limiting reactants is with a cookie recipe. I’m using the Quaker Oats raisin cookie recipe, my husband, Rob’s favorite for his birthday on Sunday. Okay, I made bars and halved the recipe; Rob is the only one in our little household who likes oatmeal raisin cookies. The way to teach limiting reactants is to limit one ingredient, such as one egg. If one standard recipe makes four dozen cookies, how many cookies can you make with one egg? Let your kid explain that all of the ingredients would need to be halved. Ignore comments such as one recipe NEVER provide four dozen cookies. How many cookies can you make if you have four eggs and only one cup of brown sugar—the other ingredients are in excess: a bag of flour, five pounds of white sugar, three ounces of vanilla, etc. These types of measures underlying the limiting reactant and Stoichiometry concepts. Here is the slideshow I’m using to introduce Stoichiometry with cookies.
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