$1$a$)$

Choose the list that is ordered with increasing $($lowest to highest$)$ enthalpies of reaction:

physical changes, chemical changes, nuclear changes

chemical changes, nuclear changes, physical changes

nuclear changes, physical changes, chemical changes

physical changes, nuclear changes, chemical changes

chemical changes, physical changes, nuclear changes

b$)$

What is the molar enthalpy change with respect to nitrogen dioxide? $2$NH$3($g$)+4$H$2$O$($l$)-->2$NO$2($g$)+7$H$2($g$)\backslash$Delta H $=-54\mathrm{.}7$ kJ

c$)$

Which of the following pairs of values are understood to be numerically equal?

heat change and enthalpy change

activation energy and molar enthalpy change

enthalpy change and molar enthalpy change

enthalpy change and activation energy

molar enthalpy change and heat change