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exothermic: when the reactants can convert potential energy (stored energy) into kinetic energy. flow of energy into surroundings, surroundings get warmer. the reactants have more energy that the products. energy is lost. the change in enthalpy is negative. the energy sign is on the right side of the arrow (in the equation). exothermic reactions are bond forming

endothermic: reactants convert kinetic energy into potential energy during the formation of the products. causes a decrease in temp of the surroundings because it is drawing the heat from it. products have more energy than the reactants. energy is gained. change in enthalpy is positive. the energy sign is on the left side of the arrow (in the equation). endothermic reactions are bond breaking

note - enthalpy is another term for potential energy or heat content, the words can be used interchangeably

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Is solid exothermic or endothermic?

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


What contrast endothermic and exothermic changes?

Exothermic: release of heat Endothermic: absorption of heat


Which state changes are exothermic and endothermic?

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


Which phase changes are endothermic?

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.


Which of the following phase changes is not correctly paired with the sign of its change in enthalpy?

The phase change of sublimation is not correctly paired with the sign of its change in enthalpy. Sublimation involves the transition from solid to gas phase without passing through the liquid phase, and it is an endothermic process where heat is absorbed. The other phase changes—melting (endothermic), freezing (exothermic), vaporization (endothermic), and condensation (exothermic)—are correctly paired with the sign of their change in enthalpy.


Is a liquid endothermic or exothemic?

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.


Is freeezing endothermic or exothermic?

Freezing is exothermic, as the substance that is freezing loses energy to its surroundings.


How does an endothermic process differ from an exothermic process?

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)..


How can you tell the difference between an endothermic and exothermic reaction?

You can generally tell by changes in temperature, whether you have an exothermic reaction which produces heat, or an endothermic reaction which consumes heat.


Is vaporization exothermic or endothermic?

It is endothermic. Endothermic is to gain heat and Exothermic is to lose heat.


What are the phase changes that are endothermic?

For example melting or boiling.


What is the opposite of exothermic?

The opposite of exothermic is endothermic. Exothermic reactions are those which give off energy in the form of heat. Endothermic reactions require energy.