In the first law of thermodynamics,ΔU = Q + W,W is positive when

Question

In the first law of thermodynamics,Δ​U​ = ​Q ​ + ​W​,W is positive when

Quizplus · Accepted Answer

According to the first law of thermodynamics, the internal energy of a system can be changed by either heat transfer or work. The work done on the system by the environment is positive when the system is losing energy to the environment, which is typically the case for exothermic processes. Therefore, option B is correct as work is being done on the system by the environment. Option A is incorrect as work done on the environment by the system is negative. Option C and D are incorrect as they include an increase in temperature, but the first law doesn't directly relate work to temperature changes.

In the First Law of Thermodynamics,Δ​U​ = ​Q ​

In the First Law of Thermodynamics,ΔU = Q