The three phase changes that require energy to be removed are condensation, freezing, and deposition. During condensation, gas transitions to liquid, releasing energy. Freezing occurs when a liquid changes to a solid, also releasing energy. Deposition is the direct transition from gas to solid, which releases energy as well.
The types of phase changes that require energy are melting (solid to liquid), sublimation (solid to gas), and evaporation (liquid to gas). These phase changes require energy input to break the intermolecular forces holding the particles together in a particular phase.
Phase changes requiring the addition of heat energy are the phase changes from solid to liquid, liquid to gas, and solid to gas. These phase changes are termed melting (solid to liquid), evaporation (liquid to gas), and sublimation (solid to gas).
Based on chemical properties exothermic phase changes are those that release energy. The exothermic phase changes are gas--> liquid, liquid --> solid, and gas--> solid. Looking at a phase diagram if you are going up the "stairs" the conversions require energy going down the "stairs" energy is released.
Heat is a form of energy that is transferred between objects due to temperature differences. Phase changes are transitions between different states of matter, such as solid, liquid, and gas, which occur when heat is added or removed from a substance. These changes are governed by the energy exchange between molecules.
The heat energy in the milk had to be removed in order to change the phase of milk.
Condensation
The heat of fusion is the energy required to change a substance from a solid to a liquid, while the heat of vaporization is the energy needed to change a substance from a liquid to a gas. Both are types of phase changes that require specific amounts of energy to occur.
Phase changes requiring the addition of heat energy are the phase changes from solid to liquid, liquid to gas, and solid to gas. These phase changes are termed melting (solid to liquid), evaporation (liquid to gas), and sublimation (solid to gas).
It is converted to bond energy
Changes of state that involve going from a solid to a gas state, such as sublimation, typically require the most energy. This is because it involves overcoming both the intermolecular forces holding the solid together and the potential energy barriers to separate the molecules into a gas phase.
Liquid to solid
During phase changes, energy is either absorbed or released in the form of heat. This energy is used to break or form intermolecular forces between particles. As a result, temperature remains constant during the phase change until all the substance has transitioned to the new phase.