• 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)

    - same thing happens * Eventually forms a superbug as it becomes resistant to most antibiotics e.g. MRSA Mutation - a random spontaneous change in DNA The Eye We can detect changes in the environment (stimuli) by using our senses.

  2. Marked by a teacher

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

    4 star(s)

    This amount of oxygen is sufficient for the process under normal conditions. This is because cellular respiration converts the energy in chemical bonds into energy that can be used to power body processes. Glucose is the molecule mainly used to fuel this process.

  1. 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?

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

    However, For Glucose and Maltose, I noticed that the rate of respiration in the second half of the experiment (most notably between minutes 6 and 9) was faster than the first half of the experiment. I felt that this should not have been the case as the initial rate of

  1. Should the cloning of humans be allowed?

    There are two arguments that counter this. Firstly, there is the likelihood of genetic diversity reduction because for this even to happen on the large scale those against cloning say, a very large amount of people would have to be cloned and this is unlikely because of the general distrust of cloning in the first place.

  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. The effect of exercise on gas exchange and breathing

    Collection period RMV (L/min) Respiratory minute volume TV (L) Tidal volume N Number of breaths BPM Number of breaths per min % O2 % O2 in the gas collected V O2 PM (L/min) Volume of oxygen expired per min % CO2 % CO2 in the gas collected V CO2 PM (L/min)

  2. Should people with diabetes 2 receive medical treatment?

    Vitamins work with other nutrients in metabolic processes, digestion and the development of blood cells. Some vitamins are thought to boost the immune system. There are 13 different vitamins that can be divided into two categories: water-soluble and fat-soluble. Water soluble vitamins help the body to break down and digest

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