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Is there a relation between the energy release when nuts are burn and the structure of their content?

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Introduction

                                                                                                                                 Mariano Bacigalupi

                                                                                                                                 17/11/02

Energy practical

Is there a relation between the energy release when nuts are burn and the structure of their content?

Aim

The aim of this experiment is to see if the content of the nuts affects the energy release when nuts are burned.

Hypothesis

The nut that has the highest amount of lipids is the one that’s going to produce more energy because lipids have the structure that was more carbon hydrogen bonds.

The method use to get the require data

The first thing that I had to do to get this practical going was to:

  • Put together a calorimeter as in fig. 1.
  • Measure a fix amount of water (like as I used my case 270 g).
  • Get some peanuts and weight one complete peanut.
  • Get the vacuum and the oxygen going in the calorimeter.
  • Record the temperature of the calorimeter as the starting temperature.
  • Light the peanut and put it under the calorimeter
  • When the nut is totally burn record the temperature as final temperature.
  • Let the calorimeter cool down.
  • Use the equation image00.png to get the energy store in the nuts and use 4.18 (Heat capacity of water) as C.
  • Record all this information on a chart.
  • When finish redo the experiment but using an almond and then using a cashew nut.
...read more.

Middle

4.80

Initial mass (g)

1.00

1.30

0.55

Final mass (g)

0.00

0.00

0.00

Difference in mass (g)

1.00

1.30

0.55

Energy store (KJ)

37.62

81.51

11.04

Chart 1

Energy calculations

Almont

  • Energy= 1*4.18*9
  • Energy= 37.62 KJ

Cashew

  • Energy= 1.3*4.18*15
  • Energy= 81.51 KJ

Peanut

  • Energy= 0.55*4.18*4.8
  • Energy= 11.04 KJ

Content of each nut

Peanut

Almond

Cashew

Proteins (g)

0.33

0.17

0.20

Carbohydrates (g)

0.10

0.23

0.25

Lipids (g)

0.50

0.49

0.54

Energy stored calculated one (KJ)

11.04

37.62

81.51

Chart 2

Energy data graph

image02.pngGraph 1

This graph show the

...read more.

Conclusion

Conclusion

The more carbon-hydrogen bonds that the energy storage the nuts have the more energy that they will have. The lipids are the structure that has more carbon-hydrogen bonds so its understandable that the nut that has more lipids would be the one that will produce more energy when burn. The longer the molecule is the more energy that it will produce when the bonds are burn because the energy that maintained the molecule together is release. The forces that existed between molecules are also broken for example in the proteins the hydrogen bonds that are the strongest intermolecular forces are broken that energy is release. This is why the nut they have mainly lipids inside because is the best way to store energy and the nut are the seeds of the plant, so when the seed starts to germinate it use the lipids and the other contents of the nut for energy to grow until the riche the nutrient of the ground to create food from photosynthesis

...read more.

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