Topic 1 - Calorimetry Flashcards
What is calorimetry?
A way to measure the energy taken in and given out during a chemical reaction
What is the purpose of calorimetry in relation to food?
To measure the amount of ‘energy’ (calories) in food
What is the first step in the calorimetry process?
Take a tube of 50ml cold water
What should you do after recording the starting temperature of the water?
Place the test tube at 45 degrees and hold a burning food sample just beneath it
How do you determine the energy transferred to the water?
Using the equation: Energy transferred = mass of water x 4.2 x temperature increase
What units are used to measure energy transferred in calorimetry?
Joules (J)
How is the mass of water measured in the calorimetry process?
In grams (g)
What does the constant 4.2 refer to in the calorimetry equation?
The ‘specific heat capacity’ of water
What is the specific heat capacity of water measured in?
J/g
How is the temperature increase measured in the calorimetry process?
In degrees Celsius
Fill in the blank: Energy transferred is measured in _______.
Joules (J)
Fill in the blank: Mass of water is measured in _______.
grams (g)
Fill in the blank: Temperature increase is measured in _______.
degrees Celsius
