AP Chem

Question 1

If a reaction can be expressed as the sum of two or more independent reactions, then the enthalpy change for the reaction is equal to the sum of the enthalpy change’s of the independent reactions

Answer 1

Hess’s Law

Question 2

The total amount of energy in the universe is constant, so energy can’t be created or destroyed, just change shape

Answer 2

First Law of Thermodynamics

Question 3

The entropy of the universe is constantly increasing

Answer 3

Second Law of Thermodynamics

Question 4

The entropy of a perfect crystalline substance is zero at absolute zero

Answer 4

Third Law of Thermodynamics