Measuring Energy and Food
Experiment 4.5 Measuring the energy content of a “Dorito” and Popcorn.
Using the method as described on page 46 of the textbook, measure the energy content of a Dorito and a “Popped” corn kernel.
Aim: 1. Compare your results of each food and determine which will give the greatest energy per gram.
2. How much of each food would you need to boil 250mL of water?
Hypothesis: (Before you begin, what do you think will be the conclusion.)
As the Dorito is heated, it will release much more heat than the popcorn. This will be the result as the Dorito has more mass than Popcorn as well as more carbohydrates. It would take about 4-5 Dorito’s or 15 Popcorn to boil 250mL of water.
[Signature of teacher: ________wwt_______________]
Variables:
Table 1: Independent Variable | Dependent Variable | Controlled Variables | The material was changed from a Dorito chip to a singular piece of popcorn. | The heat of the boiling-tube will be measured after the material has burnt out. | The amount of water will be the same for each material. The starting temperature of the water will be the same for each material.The materials will be the same distance away from the boiling-tube. |
Results: (4.2 is the value of the specific heat capacity of water, in joules per gram per degree Celsius – the number of joules taken to raise the temperature of water by 1 °C. 1 cm3 of water has a mass of 1 g. If the number is more than 1000 J/g, express it as kilojoules kJ)
Table 2. Measured Energy from Dorito Weight of Dorito (g) | Temp. Of Water at start (*C) | Temp. Of Water at end (*C) | Temp Rise of Water (*C) | Energy Released (KJ) | Energy Content (J/g) | 1.9 | 21 | 90.1 | 69.1 | 5.8044 | 3.055 |
Table 3. Measured Energy from Popcorn Weight of Popped Corn (g) | Temp. Of Water at start (*C) | Temp. Of Water at end (*C) | Temp Rise of Water | Energy Released (KJ) | Energy Content (J/g) | 0.29 | 21 | 35 | 14 | 1.1176 | 3.853 |
20cm3 water in test tube
Formula
Using the method as described on page 46 of the textbook, measure the energy content of a Dorito and a “Popped” corn kernel.
Aim: 1. Compare your results of each food and determine which will give the greatest energy per gram.
2. How much of each food would you need to boil 250mL of water?
Hypothesis: (Before you begin, what do you think will be the conclusion.)
As the Dorito is heated, it will release much more heat than the popcorn. This will be the result as the Dorito has more mass than Popcorn as well as more carbohydrates. It would take about 4-5 Dorito’s or 15 Popcorn to boil 250mL of water.
[Signature of teacher: ________wwt_______________]
Variables:
Table 1: Independent Variable | Dependent Variable | Controlled Variables | The material was changed from a Dorito chip to a singular piece of popcorn. | The heat of the boiling-tube will be measured after the material has burnt out. | The amount of water will be the same for each material. The starting temperature of the water will be the same for each material.The materials will be the same distance away from the boiling-tube. |
Results: (4.2 is the value of the specific heat capacity of water, in joules per gram per degree Celsius – the number of joules taken to raise the temperature of water by 1 °C. 1 cm3 of water has a mass of 1 g. If the number is more than 1000 J/g, express it as kilojoules kJ)
Table 2. Measured Energy from Dorito Weight of Dorito (g) | Temp. Of Water at start (*C) | Temp. Of Water at end (*C) | Temp Rise of Water (*C) | Energy Released (KJ) | Energy Content (J/g) | 1.9 | 21 | 90.1 | 69.1 | 5.8044 | 3.055 |
Table 3. Measured Energy from Popcorn Weight of Popped Corn (g) | Temp. Of Water at start (*C) | Temp. Of Water at end (*C) | Temp Rise of Water | Energy Released (KJ) | Energy Content (J/g) | 0.29 | 21 | 35 | 14 | 1.1176 | 3.853 |
20cm3 water in test tube
Formula