the cooling curve for a pure substance as it changes from a liquid to a solid is shown above. the solid and…

the cooling curve for a pure substance as it changes from a liquid to a solid is shown above. the solid and the liquid coexist at\na point q only\nb point r only\nc all points on the curve between q and s\nd all points on the curve between r and t

the cooling curve for a pure substance as it changes from a liquid to a solid is shown above. the solid and the liquid coexist at\na point q only\nb point r only\nc all points on the curve between q and s\nd all points on the curve between r and t

Answer

Brief Explanations:

During a phase - change from liquid to solid for a pure substance, the temperature remains constant as the substance releases heat to change its state. This is represented by the flat portion of the cooling curve. The flat part of the cooling curve (between R and S) is where the solid and liquid co - exist because during this time, the substance is undergoing the phase transition and both phases are present simultaneously.

Answer:

C. all points on the curve between Q and S