energy content of food Flashcards
(5 cards)
1
Q
what has to be measured to determine the energy content of food
A
the change in water temperature and the mass of the food
2
Q
what is the formula for calculating the energy of a food sample
A
energy= mass of water x temperature change x 4.2
3
Q
why should the boiling tube be at an angle
A
so the water can be heated more evenly
4
Q
what should you do when the flame of the burning sample goes out
A
relight it and continue to heat the water until the food sample does not relight anymore
5
Q
what are some sources of error in this practical
A
- incomplete combustion of the food samples
- heat loss to surroundings
- inconsistent angle of boiling tube
