• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Experiment. How much energy is there in some foods that you eat?

Extracts from this document...

Introduction

How much energy is there in some foods that you eat? Type of food Mass/g Initial temperature/�C Highest temperature/�C Change in temperature/�C Jack n' Jill Chips 1.52 23.0 55.0 32.0 Digestive 9.22 23.0 103.0 80.0 Crackers 3.10 23.0 90.0 67.0 EDO 4.19 23.0 105.0 82.0 Table of results: Formula for energy value of food: Energy transferred/ J = mass of water/g � 4.2 � temperature rise/�C Weight of food/g To find the energy in Jack n' Jill chips we should substitute the values into the equation- 20 � 4.2 � 32.0 = 1768.42 J/g 1.52 The to convert this into kilojoules per gram, to compare it to the proper amounts we must divide it by 1000- 1768.42 = 1.77kJ/g 1000 We can then do the same for Digestive biscuits, by substituting it into the formula- 20 � 4.2 � 80.0 = 728.86 J/g 728.86 = 0.73kJ/g 9.22 1000 Then, we can also find the energy in the Crackers- 20 � 4.2 � 67.0 = 1815.48 J/g 1815.48 =1.82kJ/g 3.10 1000 Lastly, we do the same with EDO crackers- 20 � 4.2 � 82 = 1643.91 J/g ...read more.

Middle

The order of amount of total fat contained in each food, by the company kJ/100g- 1. EDO 30.00 2. Jack n' Jill potato chips 29.60 3. Digestive 21.10 4. Crackers 20.20 The order of total saturated fat in each food, shown by the company, kJ/100g- 1. EDO 17.00 2. Jack n' Jill potato chips 13.20 3. Digestive 10.90 4. Crackers 9.60 There are many nutritional reasons as to why EDO is the highest on the energy level list and Digestive biscuits are the lowest. Firstly, one should look at the fat content of each individual food. As you can see that the order of energy levels is identical to the order of amount of total fat, excluding the digestive and crackers. This is because fat is a good source of energy, therefore is can store more energy than any other food group such as carbohydrates or proteins. EDO has the highest fat content and therefore the highest energy level, this supports the fact that fat is a good source of energy. However, Crackers have a higher energy level than digestives, yet it has a lower fat content. ...read more.

Conclusion

Additionally, we were not consistent in the distance of the food from the tube. This would of resulted in an inaccurate, because it would of cause the water to heat up faster or slower. Besides, I should of stirred the water, before I recorded the temperature, because this would allow an equal distribution of heat across the whole mass of the water. Since I didn't stir the water, this would of caused the experiment to be inaccurate because I could of measured the temperature of a hotter or colder area of the water. Conclusion and Future improvements: In conclusion, I felt the experiment went well. I was able to complete the experiment in sufficient time and abiding to all the safety rules. However, to improve my experiment I will change numerous aspects of our experiment. Firstly, I will do more repeats, to allow me to calculate an average. Causing my experiment to be more accurate. Additionally, I will stir the water for an equal distribution of heat, to ensure accurate results. Furthermore, I would do the experiment in a heat sealed room, similar to the manufacturers. This would prevent heat loss, allowing my results to be more accurate and reliable. conclusion ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Humans as Organisms section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Here's what a star student thought of this essay

4 star(s)

Response to the question

The response to the question is done reasonably well. The thing the answer mainly lacks is explanation as to why they did certain parts of the experiment in their analysis and deeper scientific reasons as to what their results meant. ...

Read full review

Response to the question

The response to the question is done reasonably well. The thing the answer mainly lacks is explanation as to why they did certain parts of the experiment in their analysis and deeper scientific reasons as to what their results meant. The conclusion and introduction could also be vastly improved upon.

Level of analysis

The table of results are clearly presented but the essay lacks an introduction and does not explain what they are trying to find out from the experiment and how they will do it. The calculations are accurately done but the candidate does not explain why they measured the fat content in each food. The candidate analyses the experiment well and what went wrong and how this could have affected the experiment but to increase their grade they could have made a more rounded conclusion about why the experiment went well.

Quality of writing

Spelling, grammar and punctuation are fine. The tables are set out well and the decimal places are accurate.


Did you find this review helpful? Join our team of reviewers and help other students learn

Reviewed by skatealexia 04/07/2012

Read less
Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Humans as Organisms essays

  1. Marked by a teacher

    Biology Revision notes - Human Biology

    5 star(s)

    The doctors knew whether the patient was taking a placebo or the drug. It was realized the researchers could be biased too. Observer bias could lead researchers to the results that they were expecting to find. Double-blind trial: In the double-blind trial neither the patient nor the researchers administering the

  2. Marked by a teacher

    Investigate the effect of altitude training on the density of blood.

    4 star(s)

    The process of transforming the chemical energy in food into a form that our cells can use is called respiration, and if oxygen is necessary, then it's aerobic respiration. The general chemical equation for aerobic respiration is shown below: Glucose + Oxygen Carbon Dioxide + Water + Energy C6H12O6 +

  1. An experiment to investigate the rate of anaerobic respiration of yeast in various respiratory ...

    I feel that this could be due to the amount of time I let the apparatus equilibrate. I only let the solution equilibrate for 5 minutes. This may not have been long enough for the yeast to reach a respiration rate typical of 30 degrees Celsius, and the internal and external pressure to equilibrate.

  2. Human biology short notes

    * Blood cannot reach heart muscles * Glucose and Oxygen supply to heart muscles is inadequate * Heart muscles cannot respire * And release energy for contractions * Heart muscles die * Heart stops beating How Coronary Arteries become blocked?

  1. The effect of exercise on gas exchange and breathing

    However it is important when PO2 falls below 60mmHg for example during hypoventilation, or very intense exercise. As the exercise was only moderate this reflex would probably not a significant role. During exercise a noticeable change in PCO2 and PO2 would be expected however this is not the case, as their levels remain nearly constant.

  2. Diabetes Type 1 and 2

    body, which means that the antibodies made attach to the cells in the pancreas. These are thought to destroy the cells that make insulin. It is thought that something triggers the immune system to make these antibodies. The trigger is unknown, but a popular theory is that a virus triggers the immune system to make these antibodies.

  1. Should the cloning of humans be allowed?

    mother for the rest of the pregnancy. This process is called somatic nuclear cell transfer (SCNT).1 Figure 3 Reproductive Cloning [above] The creation of Dolly the sheep has caused scientists to consider the possibility of human cloning and its implications. If a human clone was to be created, the process used would be very much similar to that of reproductive cloning used in animals.

  2. Biology 1 Edexcel Science Overview Revision Notes.

    Our parents pass 50% of each characteristic during fertilization. However, the crossing over of genes (exchange of bits of chromosomes between pairs) and genetic mutations affect how we look and are. Genetic terms: Each chromosome in a pair carries the same genes in exactly the same place (locus).

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work