Why does the temperature rise slightly immediately after crystallization begins
ID: 979840 • Letter: W
Question
Why does the temperature rise slightly immediately after crystallization begins in a substance that is being cooled?
Crystallization is an exothermic process, so as a substance crystallizes its temperature will rise
Crystallization is an endothermic process, so when it begins, the temperature drops lower than expected, then rises back up.
Solutions do not have a set freezing point and will vary with the composition.
d) A substance can be supercooled below its normal freezing point if crystallization has not been initiated. Once crystallization begins, the temeprature returns to the equilibrium freezing temperature.
2.Why is the slope of the line when crystallization is occuring in a solution not zero?
As heat is being removed from the system the temeprature will drop.
As the pure solvent crystallizes, the composition of the solution changes and the freezing point changes.
Freezing is an exothermic procees, so as energy is lost, the temperature drops.
Freezing is an endothermic process, so as energy is converted from kinetic to potential energy, the temperature drops.
a)Crystallization is an exothermic process, so as a substance crystallizes its temperature will rise
b)Crystallization is an endothermic process, so when it begins, the temperature drops lower than expected, then rises back up.
c)Solutions do not have a set freezing point and will vary with the composition.
d) A substance can be supercooled below its normal freezing point if crystallization has not been initiated. Once crystallization begins, the temeprature returns to the equilibrium freezing temperature.
2.Why is the slope of the line when crystallization is occuring in a solution not zero?
a)As heat is being removed from the system the temeprature will drop.
b)As the pure solvent crystallizes, the composition of the solution changes and the freezing point changes.
c)Freezing is an exothermic procees, so as energy is lost, the temperature drops.
d)Freezing is an endothermic process, so as energy is converted from kinetic to potential energy, the temperature drops.
Explanation / Answer
1. Ans (d)
A substance can be supercooled below its normal freezing point if crystallization has not been initiated. Once crystallization begins, the temeprature returns to the equilibrium freezing temperature.
2. Ans (b)
As the pure solvent crystallizes, the composition of the solution changes and the freezing point changes.
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