Question 1
What is the meaning of the enthalpy change of a reaction, $\Delta H_{\text{rxn}}$?
Question 2
Which statement describes an exothermic reaction?
Question 3
Which statement describes an endothermic reaction?
Question 4
Why is $\Delta H_{\text{rxn}}$ commonly measured at constant pressure in chemistry?
Question 5
What is the sign of $\Delta H_{\text{rxn}}$ for a reaction that releases $125\,\text{kJ}$ of heat?
