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Energy in Food Lab Presentation

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Jessica Ryder

on 24 January 2013

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Transcript of Energy in Food Lab Presentation

Jessica Ryder
Dunetchka Reyes
Imelda Mendez
Steve Davis
Keyiara Ridyolph Energy in Food Energy is the ability to do work. We get
energy from a number of sources, including food.All foods have energy, but
potential energy stored depends on the
type of food. When we eat food, our bodies convert the stored energy, known as Calories, to chemical energy, that allows us to do work. Introduction (cont'd) Introduction Variables, Treatments and Controls The independent variable in this experiment include the food item being tested. The dependent variable is the amount of energy released. The control variables include the amount of water and the temperature of the flame. Procedure 1. Obtain and wear goggles and apron.
2. Plug the temperature probe into the computer
3. Measure and record the mass of each food sample.
4. Measure 15 mL of water and pour it into the test tube.
5. Straighten out paper clip and stick it into the cork.
6. Clamp the test tube onto the ringstand and place in the temperature probe, making sure it does not touch the sides.
7. Stick the food sample on the paper clip, about 2 centimeters under the test tube.
8. With the lighter, set the food sample on fire and burn for five minutes or until it burns out.
9. Once complete, discard the water and refill with 15 more mL of water.
10. Repeat steps 6 through 9 with the remaining food samples. Data Equations Cashew
Q= (M x C x change in T) H2o
Q= (15 g)(1 J/g C)(45.3)
Q= 679.5 J Discussion of the Results The data shows that the heaviest food sample weighed was the granola and the lightest was the almond. The food sample with the greatest difference and mass was the cashew and the least was the granola. The data also shows that the greatest change in temperature was the Brazil nuts and the least, the pretzel.
As presented in the table that included the energy levels of each food item, our hypothesis was incorrect. We can conclude that the food sample that contained the most energy was the pecan. Its energy level was 903.25 J/grams, while the almond's energy level was 459.3 J/grams. Calories and joules are both units of energy.
The energy content of food can be determined by burning a portion of it and capturing the heat released to a known amount of water. This technique is called calorimetry. The energy content of the food is the amount of heat produced by the combustion of 1 gram of a substance, measured in kilojoules per gram (kJ/g). The purpose of the lab is to figure out which type of food releases the most energy. We will measure the amount of energy available for use from almonds, cashews, Brazilian nuts pretzels, banana chips, granola bar and beef jerky. Purpose Hypothesis If the cashews have the most amount of fat content, then it will release the most amount of energy. Materials Ring stand with 2 clamps attached
two test tubes
one test tube rack
laptop with logger lite program
temperature probe
food samples
electronic balance
lighter Food Sample Mass Initial (g) Mass Final (g) Difference (g)
Cashew 2.1 .216 1.884
Almond 1.3 .17 1.13
Pecan 1.4 .108 1.292
Banana Chip 1.1 .11 .99
Granola 4.1 3.5 .6
Pretzel 2.75 2.5 .25
Brazil Nut 2.4 .97 1.43 Food Sample Temp Initial(C) Temp Final(C) Difference(C)
Cashew 21.2 66.5 45.3
Almond 21.2 55.8 34.6
Pecan 21.2 99.0 77.8
Banana Chip 21.2 38.9 17.7
Granola 21.2 54.7 33.5
Pretzel 21.2 33.6 14.4
Brazil Nut 21.2 100.7 79.5
E= 679.5 J/1.884 g
E= 360.67 J/g Almond
Q= (M x C x change in T) H2o
Q=(15 g)(1 J/g C)(34.6)
Q= 519 J
E= 519 J/1.13 g
E= 459.3 J/g Pecan
Q= (M x C x change in T) H2o
Q= (15 g)(1 J/g C)(77.8)
Q= 1167 J E= 1167 J/1.292 g
E= 903.25 J/g Banana Chip
Q= (M x C x change in T) H2o
Q= (15g)(1cal/g C)(17.7)
Q= 265.5 J E=265.5 cal/.99g
E= 268.18 J/g Pretzel
Q= (M x C x change in T) H2o
Q= (15g)(1cal/g C)(14.4)
Q= 216 J E= 216 J/.25 g
E= 864 J/g
Granola
Q= (M x C x change in T) H2o
Q=(15g)(1 J/g C)(33.5)
Q= 502.5 J E= 502.5 J/.6g
E= 837.5 J/g Brazil Nut
Q= (M x C x change in T) H2o
Q=(15g)(1 J/g C)(79.5)
Q= 1192.5 J E= 1192.5 J/1.43g
E= 833.9J/g Food Sample Energy (J/g)
Cashew 360.67
Almond 459.3
Pecan 903.25
Banana Chip 268.18
Granola 837.5
Pretzel 864
Brazil Nut 833.9
There is a reason to believe that the results are accurate because pecans because pecans are nuts, and nuts are known for its high fat and calorie content. Also during the experiment, the flame appeared to be more overwhelming compared to the other test samples. However, it cannot be too reliable because some heat was lost to the surrounding. The experiment could have been improved by having food samples all of the same mass, by having a more accurate measurement of water and the setting of the experiment to possibly reduce the heat lost.
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