Identify each energy exchange as primarily heat or work and
determine whether the sign of ΔE is positive or negative for the
a. Sweat evaporates from skin, cooling the skin. (The evaporating
sweat is the system.)
b. A balloon expands against an external pressure. (The contents
of the balloon is the system.)
c. An aqueous chemical reaction mixture is warmed with an
external flame. (The reaction mixture is the system.)
Identify energy exchanges as primarily heat or work.
Determine whether the sign of E is positive or negative for the system.
Play a video:
This video solution was recommended by our tutors as helpful for the problem above.
Was this helpful?
Master Internal Energy with a bite sized video explanation from Jules Bruno