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When changing from a gas to
a liquid, the gas looses energy,
to become a liquid. This phase
change is exothermic.
This phase change happens when a
liquid is given heat, then starts
to boil, then evaporates into the
air, which would then be considered
a gas. This phase change is
endothermic.
Matter can exist in one of
the 3 main states: solid, liquid,
or gas. Elements and compounds
can move from one phase to
another when specific physical conditions are present.
This phase change happens when a
gas becomes a solid without going
through the liquid state. This phase
change is exothermic.
This phase change happens when a
solid turns into a gas without
going through the liquid state. This
phase change is endothermic.
The atoms of a liquid have
more energy than the atoms of
a solid. So that means this
process requires energy to go from
a solid to a liquid. This
phase change is endothermic.
http://water.usgs.gov/edu/watercyclesummary.html
http://www.chem4kids.com/files/matter_solid.html
http://www.chem4kids.com/files/matter_liquid.html
http://www.chem4kids.com/files/matter_gas.html
http://www.science.uwaterloo.ca/~cchieh/cact/c123/phases.html
http://www.chem4kids.com/files/matter_changes.html
http://www.adichemistry.com/general/state/states-of-matter.html
Condensation is the process by which water vapor in the air is changed into liquid water.
When a liquid changes to a
solid, the molecules become closer together. Also transitioning from a liquid to
a solid the liquid expands. This
phase change is exothermic.
Evaporation is the process by which water changes from a liquid to a gas or vapor.
Precipitation is water released from clouds in the form of rain, freezing rain, sleet, snow, or hail.
The Water Cycle has no definite place of starting. Most of Earth's water exists in the oceans. The suns heat, heats the ocean water, and then some of that water evaporates into the air while a little portion of the water is added as ice and snow sublimate directly from the solid state into vapor. The rising currents take this vapor up into the atmosphere, along with the water from evaporation. Precipitation then comes from cloud particles that collide, grow, and fall out of the sky. That precipitation hits the ground, and becomes groundwater. That ground water then goes to wells, rivers, lakes, or maybe back to the ocean.