1.14B **Higher and Biology Only** - Calorimetry Flashcards
What is calorimetry?
Calorimetry is a way to measure the energy taken in and given out during a chemical reaction.
How can calorimetry be used with food?
Calorimetry can be used to measure the amount of ‘energy’ (calories) in food.
What is the first step in measuring energy using calorimetry?
Take a tube of 50ml cold water.
What should you record after taking the cold water?
Record the starting temperature of the water.
What is the next step after recording the starting temperature?
Place the test tube at 45 degrees and hold a burning food sample just beneath it.
What do you do after the food is burned?
Record the final temperature of the water.
How do you calculate the energy transferred to the water?
Energy transferred = mass of water x 4.2 x temperature increase.
What units are used for energy transferred?
Energy transferred is measured in Joules (J).
How is the mass of water measured?
Mass of water is measured in grams (g).
What does the constant 4.2 refer to?
4.2 is a constant that refers to the ‘specific heat capacity’ of water.
What is the significance of the specific heat capacity of water?
It is needed to convert between temperature (degrees Celsius) and energy (Joules).
How is temperature increase measured?
Temperature increase is measured in degrees Celsius.
