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Osmosis lab- potato chip

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Introduction

Co-ordinated Sciences Lab Report 3 Comparing Energy of a Peanut, a Banana chip and a Potato Chip Aim: The aim of this experiment is to compare energy stored in peanuts, potato chips and banana chips. Background Information Food energy is the amount of energy in food that is available through digestion. The energy in food can be measured by seeing the rise in temperature of water by burning the food and then using the specific heat capacity of water to see how much energy the food contains. Specific heat capacity is the amount of energy (Joules) needed to raise the temperature of 1kg of a substance by 1oC. The formula for specific heat capacity is: Heat Captured (Joules) = Specific Heat Capacity of water(4.2 J/ oC) X Mass of water (g) X Change in temperature (oC) Hypothesis The peanut will release the most energy, because it has the most calories, followed by the potato chip and then the banana chip. Peanut (28.3g) 166 Calories Banana Chip (28.3g) 147 Calories Potato Chip (28.3g) 155 Calories Source: http://caloriecount.about.com/ Apparatus: 1 Copper beaker 1 electronic balance 1 Measuring cylinder 1 tripod stand 3 pins 1 Digital thermometer 1 Bunsen burner 1 pair of tongs Peanut Banana chips Potato chips Variables: Controlled: Mass off water (50g) ...read more.

Middle

The Heat captured (energy) per gram of peanut was 5781.8 Joules, which was much higher than the other two foods. But part of our hypothesis was wrong because the banana chip had more energy (1991.0 Joules) than the potato chip (1831.5 Joules). We had predicted the potato chip to have more energy than the banana chip because it had more calories than the banana chip, but further research showed that the banana chip had a high percentage of saturated fat, compared to potato chips which had fat, but unsaturated fat and a healthy percentage of carbohydrates. Fats release 9 calories of energy per gram and carbohydrates release 4 calories of energy per gram. Saturated fats are saturated with hydrogen i.e. they are bonded to as many hydrogens as possible. In unsaturated fats, there may be one or more double bonds. Hence saturated and unsaturated fats differ in their energy content and melting point. Since an unsaturated fat contains fewer carbon-hydrogen bonds than a saturated fat with the same number of carbon atoms, unsaturated fats will yield slightly less energy; also it might need more energy to release the energy to break the double bond. ...read more.

Conclusion

It could also be possible that some of the heat energy was not released even after the food item was completely burnt. II. We could increase the amount of water so more of the heat is conducted to the water from the beaker than being wasted by heating up the beaker. III. We should keep the Bunsen burner as close to the beaker as possible (without it heating the beaker up), so that minimum amount of energy is lost when we are moving the burning food from the Bunsen burner to the beaker. IV. We should repeat the experiment more times, at least three times so we can omit any anomalies and get an average of all the readings and then compare because there will be a lesser chance of getting a wrong conclusion. Also sometimes the food (especially the chip) only gets burnt from one side and the other side is left not burnt or by the time we get the burning food to the beaker the fire extinguishes. So to reduce the impact of these kind of mistakes on our final conclusion we should repeat the experiment. V. We could do the experiment with chips of different companies, which would be quite interesting and we would come to know which chips contain the most energy. ?? ?? ?? ?? 1 ...read more.

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