Phase cahnges and heat/cooling curves

As heat is added to a substance it undergoes some changes. Changes are changes in state which is a physical change where intermolecular bonds are broken. Melting and boiling points are determined by the vapor pressures of the solid and liquid states. At 0 degrees celsius ice and liquid water have the same vapor pressure. at 100 degrees celsius water vapor and atmospheric pressure are equal.

http://people.uwplatt.edu/~sundin/114/l114-36.htm

here are some helpful links
http://study.com/academy/lesson/what-are-heating-and-cooling-curves.html

http://www.kentchemistry.com/links/Matter/HeatingCurve.htm

https://www.boundless.com/chemistry/textbooks/boundless-chemistry-textbook/liquids-and-solids-11/phase-changes-90/heating-curve-for-water-394-3655/

https://www.youtube.com/watch?v=YG77v1PwQNM