using energy balance equations show how to transform a set of dry ingredients to
ID: 520448 • Letter: U
Question
using energy balance equations show how to transform a set of dry ingredients to an edible bowl of mac'n cheese by using the chemistry of the cooking, the various pathways that occur, and how this relates to the energy supplied by the stove.
preferred recipe;
Ingredients
3 tablespoons butter, melted
8 ounces uncooked elbow macaroni*
8 ounces sharp cheddar cheese, grated**
1 quart whole milk**
1/2 teaspoon kosher salt and several turns of the pepper mill
Instructions
Preheat the oven to 325 degrees F. Place the melted butter in a 9x13 baking dish. (I like to melt the butter in the pan as the oven is preheating. Just watch so it doesn’t burn. I set the timer for 3 minutes so I don’t forget.)
Toss the uncooked noodles in the melted butter.
Evenly cover the noodles with the shredded cheese, pour the milk over all, and sprinkle with the salt and pepper.
Bake, uncovered, for 1 hour. After 30 minutes, remove from the oven and carefully stir for about 2 minutes or until the cheese completely dissolves into the milk. Return to the oven for the final 30 minutes of baking.
If you’d like to create a little extra golden brown color and crisp bits on top, broil the mac and cheese on the top rack of the oven, watching very carefully to avoid burning, during the final 2-3 minutes of the baking time. Remove from the oven and allow the casserole to sit for a few minutes before serving.
Explanation / Answer
Initially when the oven is preheated, the electrical energy is being converted into heat energy. The oven is connected to a power supply, so electrical energy is coming to the oven. But with this, oven is being heated, so electrical energy is converted to heat energy.
When butter is kept in the oven, it starts melting. In this process, the heat energy is being supplied to the butter. The melting point of butter lies in that range, so it starts melting at that temperature.
When you toss the noodles in the butter, the mechanical energy is given by you which you get by the food which you eat. This mechanical energy is converted into heat energy, when you toss the noodles.
Similarly in stirring the ingredients, the mechanical energy is converted into heat energy.
So, overall, the energies involved in making edible bowl of mac'n cheese are:
electrical energy + heat energy + mechanical energy ---> mac'n cheese
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