1.6.4 Calorimetry Flashcards
1
Q
What is Calorimetry ?
A
Measure of enthalpy changes in reactions
2
Q
How can we set up a calirometer?
A
- Polystyrene cup, vacuum flask or metal can
- Thermometer
- Closed system
3
Q
What is the equation for energy transfer used in calirometry?
A
4.18 J/g oC specific heat capacity of water
4
Q
Example of Q=MCΔT
A
5
Q
Why might experimental values of enthalpy change be lower than data book values?
A
Heat loss from apparatus
6
Q
How to improve calorimetry method?
A
- Extrapolate cooling data back to point of addition to establish theoretical max temperature change
- Adjust cooling, apply cooling correction
- Insulate beaker and use polystyrene cup or lid to reduce heat loss
- Record temp values at regular time intervals
