enthalpy Flashcards
1
Q
What is the practical for measuring enthalpy change?
A
place 25cm^3 of distilled water into a polystyrene cup and record its initial temperature. weigh a mass of anhydrous copper sulphate. every minute record the temperature of the water in the cup, at the fourth minute rapidly add the anyhdrous copper sulphate but don’t record temperature. at the 5th minute record temp again and continue until 15 minutes.
2
Q
What is an error of the practical?
A
heat transfer to or from the surroundings.
reaction or dissolving could be slow or incomplete.
3
Q
How could you improve the accuracy?
A
lid on the cup. electronic temperature reading system.
