question archive 1) Explain how the following experimental errors affect the final calculation of the kilocalories per gram for a food item
1) Explain how the following experimental errors affect the final calculation of the kilocalories per gram for a food item
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1) Explain how the following experimental errors affect the final calculation of the kilocalories per gram for a food item. Be specific as to whether the final value will be higher or lower than if the error had not been made.
a. The student misread the scale and recorded 110.3 g for the final mass of the soda can plus water instead of 101.3 g.
b. Part of the unburned marshmallow fell off before the final mass was determined.
c. The food would not keep burning and had to be relit several times.
d. The thermometer got stuck in the aluminum foil while the food was burning and the final temperature was made with the thermometer in the air above the water and not in the water.
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a. The student misread the scale and recorded 110.3 g for the final mass of the soda can plus water instead of 101.3 g.
The value of kilocalories per gram will be lower than when the error would not have been made.
-Higher mass was recorded in the error and therefore that means that the value of kilocalories per gram will be lower since the obtained value of calories is divided by a higher mass.
b. Part of the unburned marshmallow fell off before the final mass was determined.
The kilocalories per gram will be higher than if the error had not been made.
-Part of the marsh mallow fell off. The mass lost in the fallen marsh mallow means that the end mass will be lower. The recorded mass would be the one that burns alone. This would then increase the Kcal per gram
c. The food would not keep burning and had to be relit several times.
The value of kilocalories per gram will be lower than in the case where the error was missing
-Every time the sample is lit and relit we supply external energy that is needed to be subtracted in final calculation. The end kcal will be therefore be lower.
d. The thermometer got stuck in the aluminum foil while the food was burning and the final temperature was made with the thermometer in the air above the water and not in the water.
Kilocalories per gram value would be lower than if the error had not been made.
-The heat transfer in this case is taking place from water to air and some of it is lost . Some energy is also required to raise temperatures of air. Some heat is lost and we therefore the end kCal per gram will be lower than if the thermometer was inside the water.
