Answer to Question #65819 in Physical Chemistry for umar

Question

Question 19 : Which of these followings would lead to an increase in the internal energy of a system?
Work done on the system
Loss of heat from the system
Work done by the system
Adiabatic expansion of the system

Question 20 : A process in which no heat is allowed to enter or leave a system is termed –
Isochoric
isobaric
Isothermal
Adiabatic

Answer 1

Question 19: According to the first law of thermodynamics: U = Q + A, that is, the increase in the internal energy of the system is equal to the sum of the heat transmitted by the system and the work done by the environment on the system. So the correct answer: work done on the system.

Question 20: The absence of heat transfer ( Q = 0) is characteristic only of adiabatic systems. So the correct answer: adiabatic.

Answer: Question 19: work done on the system;
Question 20: adiabatic.