Question

Indicate whether the following statements are true or false for a reversible isothermal process:(A) Q=T(∆S). (B) ∆U=0.(C) The entropy change of the system is always zero.(D) The total entropy change of the system and the surroundings is zero.(E) Q=W.(F) The entropy change of the environment is negative.(G) The total entropy change of the system and the surroundings is negative.

Answer 1

A)True

B)True

C)False

D)True

E)True

F)False

G)False

Step-by-step explanation:

Reversible -isothermal process:

We know that a process called reversible if when this process will be revers then it will not leave any effect on surrounding will return in original state.

A process is called isothermal process if ,initial and final temperature is same.

A)

Q=TΔS

Yes it is true for reversible and isothermal process.

B)

ΔU= 0

For isothermal process ΔU= 0.

It is true only for ideal gas.

C)The entropy change of system can be positive ,negative .

So it is false.

D)

We know that

Entropy change of universe = Entropy change of system + Entropy change of surrounding.

For reversible process

Entropy change of universe =0

So it is true.

E)

From first law

Q= ΔU + W

For isothermal process ΔU= 0. (only for ideal gas)

⇒Q= W

So it is true.

F)

The entropy change of surrounding can be positive ,negative .

So it is false.

G)We know that total entropy change of universe given as

Entropy change of universe = Entropy change of system + Entropy change of surrounding.

For reversible process

Total Entropy change of universe =0

So it is false.