1.14 Calorimetry Flashcards
What does calorimetry measure?
Energy taken in and given out during a chemical reaction - this can be used to measure the amount of energy (calories) in food.
What is the calorimetry method?
1- Take a tube of 50ml cold water
2- Record the starting temperature of the water
3- Place the test tube at 45 degrees and hold a burning food sample just beneath it
4- When the food is burned up, record the final temperature of the water
How do you calculate energy transferred?
energy transferred = mass of water X 4.2 X temperature increase
What is energy transferred measured in?
Joules (J)
What is the mass of water measured in?
grams (g)
What does the 4.2 refer to in calorimetry?
specific heat capacity of water
Why do we need the specific heat capacity of water?
To convert between temperature and energy
What is the specific heat capacity of water measured in?
Joules / grams (J/g)
What is temperature measured in?
degrees celsius
