Caloric Content of Food Free Essays

Ocean County College Department of Chemistry [Caloric Content of Food] Submitted by Jamie Kaiser Date Submitted:  Ã‚  Ã‚  10/2/12 Date Performed:  Ã‚  10/2/12 Lab Section: Chem-180 Course Instructor:  Bassa Purpose The purpose of the experiment was to take foods and to find out the energy content of the foods that we are experimenting with. By hands on burning or the food and taking the date that we find and putting it into equations to find what is needed. Procedure After organizing all the equipment necessary to perform the lab correctly and safety, I placed the empty beaker on to the scale and recorded the weight. We will write a custom essay sample on Caloric Content of Food or any similar topic only for you Order Now Then I filled the beaker with 50 ml of water and measured it and recorded my results. I then place the beaker onto the burner stand. I took the temperature of the water before heating it up. I first started with the marshmallow. I put the marshmallow onto the fork and measured its weight. Then I lit the marshmallow on fire and place it under the beaker. After the flame was extinguished I measure the temperature of the water and recorded it. I then place the remains of the marshmallow and fork onto the scale and recorded my findings. I proceeded to do the same thing with a walnut and then with a potato trip and recording the results of each. Observations and Results Data Table 1: Food Item – Observations| Food Item Description:| Marshmallow| Walnut| Potato Chip| Mass of food amp; holder – initial| 40. 4g| 18. 3 g| 16g| Mass of food amp; holder – final| 38. 8g| 16. 3g| 13. 5g| Mass of food burnt| 1. 6g| 2g| 2. 5g| Mass of beaker| 66. 5g| 66. 4g| 66. 5g| Mass of beaker amp; water| 107. 2g| 108. 2g| 108. 2g| Mass of water| 40. 7g| 41. 8g| 41. 7g| Water temp. – initial| 23 degrees C| 22 degrees C| 22 degrees C| Water temp. – final| 31 degrees C| 72 degrees C| 32 degrees C| Delta T (oC change)| 8 degrees C| 50 degrees C| 10 degrees C| Conclusions From the hands on experience of doing this experiment, I have been able to better understand the formula to find the energy release per gram and to properly put the information into the equation. I now have a better understanding of calorimetry and how different products vary in caloric content. References 1. 1. Hands-On Labs, Inc. (2012). General College Chemistry : Physical and Chemical Properties. (Manual page 94-100) Questions A. Which of the foods tested contains the most energy per gram? The potato chip B. How do your experimental results compare to published values? Considering the only published value that I experimented with was the marshmallow, I would have to say my results were above average. C. What type of reaction is used in calorimetry? Combustion reaction D. What are the products of the reactions? Carbon dioxide and water E. Where did the products go? Into the air, a part of the atmosphere F. A student performing an experiment to determine the caloric content of a cashew nut collected the following data: ?Mass of cashew nut before burning: 0. 55 g ?After burning: 0. 05 g ?Temp. increase of 200 g of water: 7. 0 oC 1. Calculate the total energy released by the combustion of the cashew nut by using the water temp. increase, the mass of the water and specific heat capacity of water. 58576 Joules. Using the equation Q= delta t x m x cp 2. Calculate the energy released per gram of cashew nut consumed in the reaction. 58576 Joules/0. 55g = 106502/4. 184= 25455= 2. 5 Cal 3. Using the following standards (carbohydrates (4 Cal/g), protein (4 Cal/g), and fats 9 Cal/g), determine the caloric content of a bag of your favorite snack food. Special K cracker chips Carb = 92 Protein= 8 Fats = 22. 5 How to cite Caloric Content of Food, Papers Caloric Content of Food Free Essays Department of Chemistry Caloric Content of Food Date Submitted: April 1, 2012 Date Performed: April 1, 2012 Lab Section: Chem-180-DL1 Purpose: The purpose of this lab was to measure the energy content of three different food items using the change in water temperatures from the heat of the food. Another purpose was to take the information acquired and become familiar with energy units used in food such as calories and joules. Procedure: The first step in this experiment was to weigh and record an empty 100mL beaker. We will write a custom essay sample on Caloric Content of Food or any similar topic only for you Order Now Then fill the beaker approximately halfway, weigh it and record the weight. Record the weight of the water in the beaker. Place a piece of aluminum foil on a table top. Place a wire burner stand with the beaker full of water in the center of the aluminum foil and place a candle next to the rack. Measure the weight of one marshmallow and the weight of one fork. Record both measurements. Then place the marshmallow on the fork measure and record the weight of the marshmallow and fork together. That weight should equal the measurements of the fork and marshmallow combined in the previous measurement. Measure and record the temperature of the water in Celsius and record it. Light a candle. Put the fork with the marshmallow over the candle flame. Remove the marshmallow from the flame right after it sets on fire and place it under the beaker of water. Hold it under the water until it is completely done burning. Make sure to stir the water frequently with the thermometer. When the marshmallow has burned down as much as possible, remove from under water and record the temp of the water. Then record the weight of the fork with leftover marshmallow on it. Subtract that measurement from the previous measurement of the fork with pre-burned marshmallow. Record the measurement of the marshmallow residue. Clean out the beaker of water and repeat experiment with two other foods. Pick the appropriate tools to hold the food over an open flame. Make sure to clean out beaker and reweigh before each experiment. Experimental Results Discussion of Observations Table 1 Food ItemMarshmallowPeanutPotato chip Initial Mass of food holder43g27. 5g27. 9g Final Mass of food and holder41g26. 5g26. 8g Mass of food burnt1. 0g0. 0g0. 3g Mass of beaker51. 5g51. 5g51. 5g Mass of beaker and water102. 3g95. 7g94. 5g Mass of water50. g44. 2g43. 0g Initial water temperature250C190C190C Final water temperature350C470C360C Delta T (0C change)100C280C170C Marshmallow 1063J/g = 254 calories = . 254 Cal/g Peanut 5178J/g = 1238 calories = 1. 2 Cal/g Potato chip 2040J/g = 488 calories = . 49 Cal/g Additional Questions 1. Read p. 244 or section 8. 3 of your textbook, then explain the type of reaction must have taken place in your calorimeter. A combustion reaction m ust have happened. The food turned into a gas and reacted to oxygen. 2. What were the reactants of this reaction? What were the products? The reactants were the cooked foods and the products were the energy and heat. 3. Where did the products go? The products or food mixed into the air and created a smoke and odor that was released. 4. Where are the potential areas for error in this experiment? This question is referring to errors inherent to the experiment, not the experimenter’s mistakes or lack of skills. Errors could be different products used, time to bring the products to a flame and put under the beaker which would cause a different temperature change in beaker from initial to final. How to cite Caloric Content of Food, Essay examples