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Find out which type of food from a particular type of group has the most energy per gram.

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Introduction

Mukesh Chauhan 10D6 Biology investigation Planning Aim: - My aim is to find out which type of food from a particular type of group has the most energy per gram. Scientific knowledge: - Energy can never be used up or destroyed it can only be transferred. Our body needs a certain amount of nutrition everyday so that we have enough energy to go through the day. The main type or most important type of substance that puts energy into our bodies is carbohydrates, proteins and fats. Before the energy is released from the foods that contain these nutrients, the food has to be broken down, chemically cut down and made soluble. This breakdown is called digestion, enzymes are involved with the reaction. The nutrients that are released from the foods are dissolved into the blood and circulated around the whole body. They all give energy to the body helping us to stay awake and alert. out the three main nutrients fat has the most energy. Here is a table showing the amount of energy released from carbohydrates, proteins and fats: - type of food sunflower seeds pumpkin seeds pasta plain crisp crisp bread dried peas Kj energy in 100g 2518 2527 1470 2214 1280 1265 protein in 100g 19.8 33 12 4.3 10.3 21.6 carbohydrate in 100g 18.6 9 72 45.2 61.3 50 fat in 100g 47.5 49 1 37 1.7 1.3 (table provided for investigation) ...read more.

Middle

My main experiment will have more independent variables. For this experiment we only used two different independent variables. We had to burn both types of food twice to get our results I did extra so I could get more accurate results. Prediction: - Using my scientific knowledge and my preliminary results I predict that the food containing most fat will have the most energy, because 1g of carbohydrate or protein releases 17Kj but 1g of fat releases 34Kj that is twice as much. I predict that the independent variable that will have the most energy will be the sunflower seed I am using the table in my scientific knowledge and preliminary graph to back up my prediction. Apparatus: - * Boiling tube * Bunsen burner * Safety mat * Stand, boss and clamp * Goggles * Measuring cylinder * Thermometer * Probe * Electronic balance * Water * Independent variables (types of food) * syringes Diagram: - Safety Features: - * Goggles must be worn at all times, this is because there are Bunsen burners on around the whole room, don't want any injuries from open flames. * The boiling tube must properly clamped to avoid it slipping when you are burning it. ...read more.

Conclusion

I think the sunflower seeds had a very big difference mainly because the seeds selected just had different amounts of fat in them. Evaluation: - The method I used I think gave pretty accurate results, but I think my results could have been more accurate in the way I performed the experiment. To get more accurate results I should have held every single piece of food the same distance away from the test tube. But the method I used gave reliable enough results even though they could have been more reliable. The whole experiment is based on finding the amount of energy given off by using heat, but the results couldn't have been very reliable because heat was let out to the surrounding area. Also the temperature could have gone up because there were another 14 Bunsen burners on in the room. So to have made this experiment totally accurate, it should be done inside some kind of air tight place so no heat is lost, and only one experiment at a time should be done so there isn't extra heat being given. The energy difference between the sunflower seeds in the main experiment was large. I think this was because I had just picked up two sunflower seeds with a big difference in fat. The one that had 6462k/j in 1g obviously had more fat in it. ...read more.

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