calorimetry (paper 2)

Question 1

calorimetry meaning?

Answer 1

burning food to show how much energy it contains

Question 2

what sort of food is usually used?

Answer 2

Something dry eg dried beans or pasta, as it burns easily

Question 3

Full Experiment

Answer 3

• weigh the food
• skewer it onto a mounted needle
• add a set volume of water to a boiling tube that is held on by clamp
• measure the water temperature
• set fire to the food using a bunsen burner but ensure that the bunsen is not nearby the water as this will change the results
• hold the burning food under the boiling tube until it goes out
• relight the food and hold under. Repeat until the food no longer catches fire
• measure the water temperature again

Question 4

The equation for energy IN JOULES

Answer 4

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

Question 5

the equation’s units

Answer 5

Joules/J = g/grams x C/celsius x 4.2

Question 6

specific heat capacity is what number

Answer 6

4.2

Question 7

specific heat capacity is also known as

Answer 7

a calorie

Question 8

The equation for energy is JOULES PER GRAM

Answer 8

energy per gram of food = energy of food (in J) over mass of food (in g)

divided by

Question 9

why is energy in joules per gram used?

Answer 9

to compare energy values of food fairly

Question 10

How do you increase the accuracy of an experiment?

Answer 10

• energy is lost to the surroundings
• this means that the energy value on the packet is usually higher than the tested value
• to reduce this, insulating the boiling tube eg with foil, will minimise heat loss and keep more energy in the water, thus making results more accurate

Question 11

what is needed for the experiment?

Answer 11

• thermometer
• clamp
• water
• food sample
• mounted needle