A pure substance is heated at constant pressure from –20 °C to 30 °C
PHYSICS · Single correct · AP · Physics 2: Algebra-based · Thermodynamics · Thermodynamics
Problem
A pure substance is heated at constant pressure from –20 °C to 30 °C. The temperature–time data show three distinct segments:
I. –20 °C to 0 °C (temperature rises)
II. 0 °C (temperature remains constant)
III. 0 °C to 30 °C (temperature rises)
Which segment represents an endothermic process in which the average kinetic energy of the particles does not change?
(a) Segment III only
(b) Segments I and III
(c) Segment II only
(d) Segment I only