Chemistry

What are 2 phase changes that are exothermic?

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2009-12-19 16:39:32
2009-12-19 16:39:32

2 phase changes that are exothermic are condensing and freezing.

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freezing and condensing


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.


the system releases energy to its surroundings.


condensation freezing and deposition


Change of phase from gas to liquid to solid are exothermic reaction. Condensation, deposition and freezing are exothermic processes that undergo change in phase.


Condensation (g to l), solidification (l to s) and deposition (g to s).


Gas to liquid, liquid to solid, gas to solid are all exothermic phase changes. They release heat.


Gas to liquid (condensation)Liquid to solid (freezing)Gas to solid (desposition)


freezing (liquid to solid), condensing (gas to liquid), and deposition (gas to solid)



Exothermic changes are types of changes that occur during a chemical reaction. These particular changes have occurred when chemical reactions have expelled heat or energy.


An endothermic phase change is when the substance absorbs energy from its surroundings (melting, vaporization).In an exothermic phase change the substance releases energy to its surroundings (freezing, condensation)..


A solid is itself neither endothermic or exothermic. However the phase change from liquid to solid will likely be exothermic.


freezing is exothermic, melting is endothermic, evaporation is endothermic, condensation is exothermic.


An exothermic change is a change that releases heat. Combustion is an exothermic chemical reaction.Adding water to sulfuric acid releases heat, called exothermic heat of mixing. Exothermic changes are the opposite of endothermic changes that absorb heat when they take place.


phase changes are always physical changes


Endothermic phase changes - the substance is gaining energy (being heated) and the molecules are getting more active.- solid to liquid: melting- liquid to gas: vaporization- solid to gas: sublimationExothermic phase changes - the substance is losing energy (cooling) and the molecules are slowing down.- gas to liquid: condensation- liquid to solid: freezing- gas to solid: depositionMemory helper: exo is like exit, and the heat energy exits the substance during an exothermic phase change.


A liquid on its own cannot be described as either endothermic or exothermic. The terms endothermic and exothermic are the names of two opposite process reactions. An endothermic reaction absorbs heat and and exothermic reaction gives off heat. A liquid can be involved in either an endothermic reaction or in an exothermic reaction. If you are evaporating a liquid from its liquid phase to its gas phase, then the reaction is usually endothermic and vice versa, going from the gas phase to the liquid phase, the reaction is usually exothermic.


Exothermic: release of heat Endothermic: absorption of heat


Deposition is phase change Gas to Solid. Heat is EXited, therefore, EXothermic reaction.


Sublimation is not exothermic.Sublimation, where a solid turns directly into a gas, is endothermic. Energy (heat) must be added to the substance to bring on the phase change.The opposite, deposition, where a gas turns directly into a solid, is exothermic.


Deposition (as a phase change) ix exothermic.


Phase changes are physical processes.


Phase changes are accompanied with optical contrast and therefore the feasibility of phase.


The melting phase changes are Solid~Liquid~Gas and the freezing phase changes are Gas~Liquid~Solid



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