From this graph,one should conclude that
A)most of the energy input into the system goes toward changing temperature,not changing state.
B)most of the energy input into the system goes toward a more ordered,rigid,molecular structure.
C)none of these options are correct.
D)most of the energy input into the system goes toward changing state,not changing temperature.

Question

From this graph,one should conclude that 
A)most of the energy input into the system goes toward changing temperature,not changing state. 
B)most of the energy input into the system goes toward a more ordered,rigid,molecular structure. 
C)none of these options are correct. 
D)most of the energy input into the system goes toward changing state,not changing temperature.

Quizplus · Accepted Answer

The graph shows that the energy input into the system (in the form of heat) is mostly used to change the state of the substance, indicated by the flat regions on the graph where the temperature remains constant despite continued heating. This means that the energy is being used to overcome the intermolecular forces between molecules that hold them in their current state (solid or liquid) and allow them to transition to a higher energy state (liquid or gas). Therefore, choice D is the best option.

From This Graph,one Should Conclude That