No work is done on the system, but q amount of heat is taken out from the system and given to the surroundings. Express the change in internal energy (Δ U) of this system and what type of wall does the system have ?

Question

No work is done on the system, but q amount of heat is taken out from the system and given to the surroundings. Express the change in internal energy (Δ U) of this system and what type of wall does the system have ? (A)  Δ U = w , wall is adiabatic (B)  Δ U = q - w , closed system (C)  Δ U = - q , thermally conducting walls (D)  Δ U = q , thermally conducting walls

Tardigrade Admin · Accepted Answer

w=0, the wall is thermally conducting Δ U=-q (exothermic process)

Q. No work is done on the system, but $q$ amount of heat is taken out from the system and given to the surroundings. Express the change in internal energy $(Δ U)$ of this system and what type of wall does the system have ?

$Δ U = w$ , wall is adiabatic

$Δ U = q - w$ , closed system

$Δ U = - q$ , thermally conducting walls

$Δ U = q$ , thermally conducting walls

$w = 0$ , the wall is thermally conducting $Δ U = - q$ (exothermic process)

Q. No work is done on the system, but q amount of heat is taken out from the system and given to the surroundings. Express the change in internal energy (ΔU) of this system and what type of wall does the system have ?

ΔU=w , wall is adiabatic

ΔU=q−w , closed system

ΔU=−q , thermally conducting walls

ΔU=q , thermally conducting walls