OpenStudy (anonymous):

Please help, Which phase change is an endothermic change? A. Condensation B. Vaporization C. Deposition D. Freezeing I think D but im not to sure

2 years ago
Vocaloid (vocaloid):

not quite for a phase change to be endothermic, there must be an increase in the average kinetic energy of the particles in other words, which phase change requires an increase in energy to occur?

2 years ago
OpenStudy (lolaismy):

Endothermic reactions require a shift up in a phase! so I would include endothermic=Melting, Sublimation and vapourization Exothermic reactions shift down in phase which would include Exothermic=Freezing, Deposition and condentation

2 years ago
OpenStudy (lolaismy):

Remember endothermic reactions require head (absorb heat from the surroundings) while exothermic reactions release hear (to the surroundings) thus phase up for endo, and phase down for exo :)

2 years ago
OpenStudy (lolaismy):

So in answering your question, I would put my money on B.) vapourization

2 years ago
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