Topic 2 - Energy From Food (Paper 2)

Question 1

what is calorimetry?

Answer 1

burning food to see how much enery it contains

Question 2

how would you carry out calorimetry?

Answer 2

1. get a dry food
2. weigh a small amount of the food and skewer on a mounted needle
3. add a set volume of water to a boiling tube held with a clamp
4. measure the temp of the water and set fire to the food using a bunsen burner
5. hold the food under the boiling tube until it wont relight
6. measure the temp of the water again

Question 3

how do you calculate the energy in food?

Answer 3

energy in food = mass of water x temp change of water x 4.2

Question 4

how do you calculate energy per gram of food?

Answer 4

energy per gram of food = energy in food / mass of food

Question 5

how would you increase the accuracy of a calorimitry experiment?

Answer 5

insulate the boiling tube to minimise heat loss
keep the bunsen burner away so the tube isnt heated more