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Dorito’s Lab NOTES

Dorito’s Lab NOTES. Read before you do the lab. Doritos’ Lab This lab will help us grasp the connection between food and calories (energy). We’ll use dorito’s because we have to use something, and the chips burn easier than bananas. Plus, it’s a shame to burn bananas.

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Dorito’s Lab NOTES

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  1. Dorito’s LabNOTES Read before you do the lab

  2. Doritos’ Lab This lab will help us grasp the connection between food and calories (energy). We’ll use dorito’s because we have to use something, and the chips burn easier than bananas. Plus, it’s a shame to burn bananas. Dorito’s come with a food label, because by law all packaged food must tell us what we’re actually eating. Let’s look at the label now. It says that one serving is ___ g. It also says that one serving has ______ Calories. Those are the big ones, capital C, kilo-calories. No one really ever eats one serving, so the labels are legally correct but nonsensical in our real world. But, this information will be used by us, conversions await, to turn these “Calories” into energy, which is what food is. Food is energy. You can use it, or store it, depends upon how much work your body does once eating these Doritos. We’ll use one whole chip per pair of students for this lab. Leftovers can be eaten, if you dare.

  3. Bomb Calorimeters To calculate how much energy is in food, a fancy device called a bomb calorimeter is used. It indirectly measures the energy content (which is converted from joules, to calories to kilocalories). We will “make” one of these in lab later, but not so fancy. We’ll do the exact same process as used in a nutrition lab with a $9000.00 device, but we’ll have more percent error. On the next slide is a diagram of a bomb calorimeter, and it’s necessary to understand how it works so you can construct one yourself.

  4. What you need to measure in a bomb calorimeter. Mass of food sample Mass of pure water in grams Start temperature of pure water Final temperature of pure water after burning food Using our basic heat formula, q = mCΔT, we can fill in our variables and calculate the joules of energy that the water gained. Most important question: Where did the energy to heat the water come from? We will make a “calorimeter” now. You need a can and a thermometer. A ring stand and a glass rod. And some water. Also a piece of Aluminum Foil to direct the heat. Crucible tongs will be needed to hold the chip.

  5. This “Calorimeter” will not be an exact instrument, and your percent error will be enormous. Nonetheless, this lab will make you “DO” exactly as you would in a nutritional lab, calculating the energy stored in Doritos’ chips. Everything is just a conversion away. Hair up, fire hot, goggles on. Don’t eat burnt chips no matter how odd you are, they’re gross. If you’re under 50% error: great!

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