science question that needs answering?

Question

when water condenses, heat energy is released. Explain this in terms of particles and changing state.
Please answer

Answer 1

Well, in brief terms.
heat energy is added to melt solids, and vaporize liquids.
So in the reverse reaction, condensation of vapor and crystalization of liquids is releasing heat energy.

The water particles are slowing down from quick moving vapor form to slower moving liquid form. And H2O particles are moving extremely slow in ice form.

Answer 2

Steam is water vapour (gas) and its molecules (particles) are in a highly excited state having had latent heat of vaporisation added to water at 100°C without changing its temperature (2260kj of heat added). Latent heat of vaporisation is a much higher quantity of heat energy than that required to heat the water to boiling point.

When this heat is removed (released) from steam, the molecular motion decreases and the particles move closer together until all of the latent heat has been removed and the steam condenses to water but still at 100°C.

If we take 1kg of steam at 100°C and release (remove) 2260kj of
heat energy, it will all condense to 1kg of water at 100°C.

Answer 3

When molecules go from a gas phase to a liquid phase, their molecular motion slows down. In order to slow down, they must give off energy.