The specific heat of a substance is the amount of energy required to raise one gram of the material by one degree centigrade. But what happens if you get an ice cube too hot?  It is no longer an ice cube.  Changing the energy within a substance changes the temperature which can lead to a change in state of the substance.  A gas cools to become a liquid, and then cools further to become solid.

During a phase change the energy of the substance will change.  In changing from a liquid to a gas the heat that must be absorbed is the heat of vaporization. 

The reverse is also true.  The heat of vaporization is the amount of heat released when a substance changes from a gas to a liquid.

The quantity of heat needed to turn solid to liquid is called the heat of fusion. Again, the reverse is true.  The heat added to turn solid into liquid is the heat which needs to be removed to turn liquid into solid.

Since the amount of heat needed to vaporize a certain amount of liquid depends on how much liquid you have, heats of vaporization and fusion are written in J/g.  The total quantity of heat is written as

Posted Date: 4/30/2013 1:19:22 AM | Location : United States

Ask an Expert

Related Discussions:- Determine energy change and change of state, Assignment Help, Ask Question on Determine energy change and change of state, Get Answer, Expert's Help, Determine energy change and change of state Discussions

Write discussion on Determine energy change and change of state
Your posts are moderated

Write your message here..

Related Questions

Meralargy, role of silica in cupper abstraction role of silica in cupper abstraction

Basic organic chemistry, can you locate ortho,meta para positions on a benz... can you locate ortho,meta para positions on a benzene ring

Show the dimensional analysis, Q. Show the Dimensional analysis? Dimens... Q. Show the Dimensional analysis? Dimensional analysis Dimensional analysis is a process of problem solving that focuses on the units that are used to describe matter. Dimensio

Ch3-chbr-ch2-chcl-ch3, CH 3 -CHBR-CH 2 -CHCL-CH 3 1     2        3      4... CH 3 -CHBR-CH 2 -CHCL-CH 3 1     2        3      4    5       Br abd Cl are side chain. numbering is done so that the alphabet that comes first in order get lowest number i.e.,

Atomic Absorption Spectroscopy, Difference between AAS and AES Difference between AAS and AES

Metal halide, why pcl3 is less polar than sicl4 why pcl3 is less polar than sicl4

Volumetric analysis, What is meant by a link solution ? What is meant by a link solution ?

Voltametry, write a short note on cyclic voltametry write a short note on cyclic voltametry

Electroanalytical technique, Electroanalytical technique: An electroan... Electroanalytical technique: An electroanalytical technique is based on the measurement of one or more electrical quantities and their magnitudes could be correlated with the

I.u.p.a.c secondary suffix , Secondary suffix name Secondary suffix name