PCHEM EXAM 2

State the second law of thermodynamics

Any spontaneous process increases the entropy of the universe

State the third law of thermodynamics

Entropy of a perfectly crystalline substance at absolute zero temp (0K) is zero

2.54 J/K

If the insulation was poor, then heat would escape the calorimeter. This would cause a smaller temperature change than expected, meaning |change in T| would be smaller than if the insulation was effective

For a bomb calorimeter, change in U=q_u=C(changein)T. So, a smaller |change in T| will also cause a smaller measured q, and therefore a smaller |change in comb U|