Suppose your favorite TV scientist has equal masses of frozen water (ice) and liquid water. If she decides to cause both substances to go through a phase change to a phase with more energy (ice to water, water to steam), which substance will require more energy to change phases? The latent heat of fusion for water is Lf,water 3.33. 105, and the latent heat of vaporization for water is Lv,water 2.26. 106 O Changing liquid water to steam requires more energy. kg O They require the same amount of energy. O Changing ice to liquid water requires more energy.
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.
![Suppose your favorite TV scientist has equal masses of frozen water (ice) and liquid water. If she decides to cause both substances to go through a phase change to a phase with more energy (ice to water, water to steam), which substance will require more energy to
change phases? The latent heat of fusion for water is Lf,water-3.33. 105, and the latent heat of vaporization for water is Ly,water-2.26. 106
kg
kg
O Changing liquid water to steam requires more energy.
O They require the same amount of energy.
O Changing ice to liquid water requires more energy.
Select true or false for the following statements.
✓Vaporization is when a substance goes from a gas to a liquid.
✓ The temperature of a substance does not change during a phase change.
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✓ It always takes the same amount of energy to change a substance from solid to liquid as it does to change it from liquid to gas.
✓ A substance can exist in two different states of matter at the same temperature.
✓ The negative sign in the equation Q=± mL represents when thermal energy is being taken away from a substance during a phase change.
✓ The temperature of a substance changes during a phase change.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc1d36c23-2c7d-4e50-89f8-a1a80d0450ff%2F201f6f5b-ec8c-470c-bc15-eea3a7dca66c%2Fqu3974j_processed.png&w=3840&q=75)
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