exothermic/endothermic?

[lilchinoboy03]

A topscore question ended up having the answer that ice melting is endothermic. I assume it it right, but can anyone enlighten me a little bit about how I can reason this?

How about the other phase changes? freezing would be exothermic then??? How about evaporation vs. condensation. or sublimation vs deposition?

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[joonkimdds]

A topscore question ended up having the answer that ice melting is endothermic. I assume it it right, but can anyone enlighten me a little bit about how I can reason this?

How about the other phase changes? freezing would be exothermic then??? How about evaporation vs. condensation. or sublimation vs deposition?

Think about it.
How do you melt the ice?
You have to add the heat to it.
Adding heat means endothermic because endo means enter, and thermic means heat. Heat enters the ice and melt it.

How do you freeze the water? you have to take heat away from it.
Heat, Exit = ExoThermic.

Evaporation = make water really really hot!
so you have to add heat.
heat enters water = Enter Heat = EndoThermic, easy right?
I will leave the rest of the questions for you.