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

To determine the amount of energy in different foods and to find out how much this depends on the fat content of the food.

Extracts from this document...


Burning Foods Investigation Aim: To determine the amount of energy in different foods and to find out how much this depends on the fat content of the food. Introduction Most foods contain fats, carbohydrates and proteins, usually in a mixture. These are all organic molecules, which contain energy. This investigation looks at the amount of energy in six different foods. Energy values are measured by burning the foods underneath a boiling tube containing a fixed volume of water. The temperature rise in the water can be used to calculate the energy values in the water. Energy released from food (J) =mass of water (G) x temperature rise (�C) x 4.2 If you divide this value by the mass of the food, you get a fair comparison. Equipment > Test tubes > Mounting needle > Retort stand with clamp > Bunsen burner > Thermometer > Water Method > Gather equipment, test tubes, Bunsen burner, foods and retort stand. > Pour exactly 15cm� of room temperature water into the test tube. > Clamp the test tube using the retort stand and place thermometer inside. > Record the temperature of water. > Find the mass of the food and record. > Place the food onto a mounted needle. ...read more.


> Fats that we eat enter the digestive system and meet with the enzyme, lipase. Lipase breaks the fat into its parts: glycerol and fatty acids. These are then reassembled into triglycerides for transport in the bloodstream. Muscle cells and fat (adipose) cells absorb the triglycerides either to store them or to burn them as fuel. > One gram of fat contains 9 calories of energy. When burnt, the calories would be released due to the flames. > We acquire energy to preserve metabolism and during any physical activities in our everyday lives. > Carbohydrates contribute to 44% of our total energy whilst fats contribute to about 41%. > Fats - Also known as lipids, fats produce twice the amount of energy that carbohydrates are capable of producing, and this is due to the more complex nature of their structure. Their are five different types of lipid, either, triglycerides, phospholipids, glycolipids, steroids and waxes > Fats help stabilize blood sugar > Fats cushion vital organs and help to maintain body temperature. > Fats delay hunger pains due to a mixture, which contains fat that remains longer in your stomach. > Saturated fats can raise level of cholesterol in blood. > Fats tend to burn slowly. ...read more.


Firstly, I could have carried out the experiment in a separate room to other students as the room temperature kept rising due to the constant heat from Bunsen burners. I could have used a clamp to hold the mounted needle, instead of my hands that were not always steady, to be sure that the food was the same distance from the test tube. To ensure the experiment was a fair test, some of the different foods could have been dried out to make sure all the water content had been removed; therefore, more flames would have been produced from energy within. I do not think I could have done anything to affect the water temperature as it was taken straight from the tap. I could have used the same syringe to pour the water to make the measurements the same as the syringes used may have had a slight difference in measurement. A better result could have been achieved by performing the experiment in a different room as many students were performing the experiment at the same time. Using a digital thermometer instead of a standard thermometer would have enabled me with a more accurate reading, therefore providing me with a more accurate energy content. The amount of water could have been increased to obtain better results. Instead of only using 15cm� of water this could have been increased to 30cm�of water. Biology Coursework Jaspreet Athwal 10P/10D2 1 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Energy, Respiration & the Environment section.

Found what you're looking for?

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

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 AS and A Level Energy, Respiration & the Environment essays

  1. Marked by a teacher

    To make sure we have plenty of energy in the future, it's up to ...

    4 star(s)

    Animals eat plants for food. And as we found out earlier, decaying plants and animals millions of years ago produced the coal, oil and natural gas that we use today. So, fossil fuels actually got their start as sunlight many millions of years ago. The sun can also be used to heat water for hot water in our homes and businesses.

  2. Marked by a teacher

    Find the relationship between amount of fat and amount of energy produced in different ...

    4 star(s)

    The tip of a flame is the hottest part. If the distance were altered, it would apply different amounts of heat to the boiling tube. Again, this would lead to inaccurate results. The amount of time taken to move ignited food to the boiling tube must be as quick as possible.

  1. Investigate the effect of bile salt concentration on the digestion of milk by the ...

    When the time reaches 20 seconds, add 10cm3 of the 5% lipase solution into the conical flask containing the alkaline milk and the bile salts, using a different pipette. Make sure that the lipase solution is measured precisely by ensuring that at eye level the meniscus of the lipase solution touches the calibration mark on the pipette.

  2. the effect of bile concentration on the activity of the enzyme lipase during the ...

    For this experiment we used the same volume of distilled water as we used for bile salts for the previous experiments therefore if bile salts did have an effect on the activity of lipase then adding water instead of bile salts would make to breakdown of milk by lipase slow down or cease to work.

  1. An investigation into the distribution of adult and juvenile limpets on a rocky shoreline.

    Adult limpets prefer the middle shore due to the harsh conditions exhibited in the lower and upper shore. The upper shore is more exposed and increases evaporation and water loss, possibly resulting in desiccation in severely high temperature. The upper shore is uncovered for the longest time in comparisons to

  2. Case study - Outbreak of food poisoning at scientific conference.

    unpasteurised dairy products which in this case are not the sample which have been examined. From these investigations, the hypothesised micro-organism caused the outbreak was S. enterica. Salmonella can be passed from animal products to human, from animals to animals, and by oral route.

  1. This experiment design by a group of general science to test different foods for ...

    Therefore the below safety assessment is important * Goggles, ensure that the Goggle has to be wear during investigation to prevent any chemical getting to eyes, from your experiment or others * Lab coat must be wear during this experiment to protect against contamination from hazardous biological and chemical materials.

  2. Why the Body Needs Energy? Every living cell within the ...

    When the blood is under high pressure in the arteries courses the semi lunar valve to shut this den produces a second heart sound 'dub', therefore during diastole all the muscle in the heart relaxes, and the blood from the vena cava and the pulmonary vein enters the atria.

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