Ateacher is peeling an orange at the front of a classroom. where in the room
are the molecules from the orange most concentrated?

a. at the back of the room
b. near the orange
c. in the second row of students
d. by an open window

nucleus

would be most reasonable answer tbh

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.