THER 428: Estimacing the Calorle Content of Nuts 59 saction Pre-Laboratory Assig
ID: 1035165 • Letter: T
Question
THER 428: Estimacing the Calorle Content of Nuts 59 saction Pre-Laboratory Assignment 1. Briefly describe the safety precautions you must take during this experiment. 3. (1) Will you be estimating the gross energy or the physiologic energy value of a peanut when you do the calculations for this experiment? Briefly explain. 2. Briefly explain the following terms as they apply to this experiment. (1) exothermic reaction (2) With which food label value will you compare your experimental result when calculating the percent difference in your determination of energy content? Briefly explain. (2) combustion reaction 4. A student followed the procedure of this experi- ment to determine the Caloric content of a Planters cocktail peanut. The peanut studied had a mass of 0.609 g before combustion and 0.053 g after combus- tion. The energy released during combustion caused a 1 4.2° C increase in the temperature of 200.0 mLof wa- ter in the calorimeter. (3) fatty acid (1) Calculate the mass of peanut burned. (4) specific heat capacity of water (2) Calculate the mass, in kg, of water present in the calorimeter, using Equation 6. 5) physiologic energy values for lipidsExplanation / Answer
1) Safety precautions:
(i) Safety goggles and Lab Cot(jacket) required for lab experiments.
(ii) Do not touch any lab equipment, chemicals, or other materials in the laboratory area until you are instructed to do so.
(iii) Never taste, touch, or smell any chemicals in the lab.
(iv) Dispose of all waste materials properly in dustbin. Never mix chemicals in the sinks. sinks should be used only for water and those solutions designated by the teachers. All other materials are to be disposed of in the garbage can.
(v) Report any accidents(spills, breakage or injury cut, burn) to the teacher immediately, no matter how trivial it may appear.
(vi) Purses and bags should be stored in the classroom area or out of Lab.
(vii) Do not eat, drink, or chew gum in the lab. Do not use laboratory glassware as containers for food or beverages.
(viii) You can burn your fingers, singe your hair, ignite paper if matches are not used properly.
2)
(1) Exothermic Reaction: A chemical reaction that releases energy, usually in the form of heat.or An exothermic reaction is a reaction that produces energy.
(2) Combustion reaction: The reaction of a substance with oxygen, producing one or more oxides, heat and light or A combustion reaction is a reaction of a compound with oxygen (O2) that forms carbon dioxide and water
(3) FATTY ACIDS: are the aliphatic monocarboxylic acids that are mostly obtained from hydrolysis of natural fats and oils.
A fatty acid is an organic compound that contains a carboxylic acid and has 10 or more carbon atoms.
They are named according to the position of the first double bond.as saturation increases fats become less solid and more liquid at room temperature
(4) specific heat capacity:The amount of energy it takes to raise the temperature of a substance 1 degree.
The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C
It also describes the relationship between the temperature change of water to the energy input or loss.
(5) Physiologic energy values for lipids: It represents the actual energy content of each lipid that is available for use by the human body.Not all of energy in foods can be extracted and used by the human body.
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