PS1.B: Chemical Reactions

I can construct an argument with evidence that some changes caused by heating or cooling can be reversed and some can not.


Evaporation: Evaporation is the change of state from liquid to gas. Hot temperature or blowing wind can convert water into water vapors.

Condensation: Condensation is the process in which gas changes to a liquid.

Freezing: Freezing or solidification is a phase change in which a liquid turns into a solid when its temperature is lowered below its freezing point.
Water freezes into ice by lowering temperature (cooling).

Melting: Solid changes to liquid on application of heat. Change of state of matter from solid to liquid is called melting. For example, ice changes to water when it is heated.