Fill in the blanks:
$(i)$ $A$ system that allows the exchange of energy but not matter with the surroundings is called a ........ .
$(ii)$ The total amount of energy consisting of the internal energy of a substance plus the product of its pressure and volume is called ........ .
$(iii)$ The change in energy that occurs when a chemical reaction is carried out at constant pressure is called ........ .

• A
  Closed system,Enthalpy,Enthalpy change
• B
  Open system,Internal energy,Entropy change
• C
  Isolated system,Gibbs energy,Internal energy change
• D
  Closed system,Entropy,Enthalpy change