Energy requirements to convert an ice cube at -10.0 °C to liquid water at +10.0 °C Energy required to raise temperature of solid: q1mCs, solid T Energy required to convert from solid to liquid: Temperature (°C) 10 8 N N पं -6 -8 qz = nΔΗ fusion Energy required to raise temperature of liquid: q3= MCs, liquid T Added Thermal Energy Note: you should be familiar with all of the variables and units in these equations from the last chapter of material on Thermochemistry (Tro, chapter 6). The only new variable is AHfusion, which is the enthalpy change for the melting (fusion) of a solid. -10 solid → liquid phase transition 1 2 3 10 °C temperature change of solid 10 °C temperature change of liquid
Energy requirements to convert an ice cube at -10.0 °C to liquid water at +10.0 °C Energy required to raise temperature of solid: q1mCs, solid T Energy required to convert from solid to liquid: Temperature (°C) 10 8 N N पं -6 -8 qz = nΔΗ fusion Energy required to raise temperature of liquid: q3= MCs, liquid T Added Thermal Energy Note: you should be familiar with all of the variables and units in these equations from the last chapter of material on Thermochemistry (Tro, chapter 6). The only new variable is AHfusion, which is the enthalpy change for the melting (fusion) of a solid. -10 solid → liquid phase transition 1 2 3 10 °C temperature change of solid 10 °C temperature change of liquid
Chemistry & Chemical Reactivity
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Chapter12: The Solid State
Section: Chapter Questions
Problem 31PS: Benzene, C6H6, is an organic liquid that freezes at 5.5 C (Figure 11.1) to form beautiful,...
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Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
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Transcribed Image Text:Energy requirements to convert an ice cube at -10.0 °C to liquid water at +10.0 °C
Energy required to raise
temperature of solid:
q1mCs, solid T
Energy required to convert
from solid to liquid:
qz = nΔΗ fusion
Energy required to raise
temperature of liquid:
93 = MCs, liquid T
Added Thermal Energy
Note: you should be familiar with all of the variables and units in these equations from the last
chapter of material on Thermochemistry (Tro, chapter 6). The only new variable is AHfusion, which is the
enthalpy change for the melting (fusion) of a solid.
Temperature (°C)
10
8
-4
6 00
Model 1 continued.
-6
-8
-10
1
solid → liquid
phase transition
2
10 °C temperature
change of solid
3
10 °C temperature
change of liquid
Transcribed Image Text:In Model 1, Why is the slope zero in line segment labeled 2?
ideally there is no change in temperature during phase changes
O all of these listed items are factored in
heat is not being added to the melting sample
the rate of adding heat has gone to zero
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