When doing the energy contents of food practical give 2 reasons why should you only burn small quantities of food?
Answers
Answer:
Food provides energy and nutrients. Components of the diet have different sources and functions. An unbalanced diet can lead to deficiency diseases. Energy needs vary according to age and activity.
Explanation:
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Answer:
Food provides energy and nutrients. Components of the diet have different sources and functions. An unbalanced diet can lead to deficiency diseases. Energy needs vary according to age and activity.
The energy content of food
The energy content in a food sample can be measured using simple calorimetry.
Calorimetry
To carry out this experiment, you need to:
pour cold water into a boiling tube
record the starting temperature of the water
record the mass of the food sample
heat the food until it catches fire
heat the water using the flame from the burning food
record the final temperature of the water
Food calorimeter. A test tube partly filled with water and containing a thermometer is suspended above a mounted needle on which is attached burning food.
Investigating the energy content in a food sample
Calculations
Work out the energy transferred to the water with this equation:
energy transferred (J) = mass of water (g) × 4.2 (J/g°C) × temperature increase (°C)
Explanation: