Topic 1 - Calorimerty Flashcards
What is calorimetry?
Calorimetry is a way to measure the energy taken in and given out during a chemical reaction.
What can calorimetry be used to measure?
The amount of ‘energy’ (calories) in food.
What is the first step in measuring energy in food using calorimetry?
Take a tube of 50ml cold water.
What should be recorded before starting the calorimetry experiment?
The starting temperature of the water.
At what angle should the test tube be held during the experiment?
45 degrees.
What is done with the burning food sample during the experiment?
It is held just beneath the test tube.
What is recorded after the food sample is burned?
The final temperature of the water.
What is the equation to calculate energy transferred to the water?
Energy transferred = mass of water x 4.2 x temperature increase.
In what unit is energy transferred measured?
Joules (J).
In what unit is mass of water measured?
Grams (g).
What does the constant 4.2 refer to in the energy transfer equation?
‘Specific heat capacity’ of water.
What is the specific heat capacity of water measured in?
J/g.
What is temperature increase measured in?
Degrees Celsius.
