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

Purge and recycle stream, The fresh feed to an ammonia production process c... The fresh feed to an ammonia production process contains nitrogen (N 2 ) and hydrogen (H 2 ) in stoichiometric proportion, along with an inert gas (I).   The feed is combined with

Removal of nitrogen in waste water, Question 1: a. Describe in details ... Question 1: a. Describe in details the composting process. b. Odour is very often a big problem in composting facilities.  Describe some odour avoidance and odour treatment

Graham''s law, a nitrogen molecule travel at about 505 m/s at room temperat... a nitrogen molecule travel at about 505 m/s at room temperature. find the velocity of a helium atom at the same temperature

Electromagnetic spectrum, Q. What is the electromagnetic spectrum? Ans... Q. What is the electromagnetic spectrum? Ans. Light is a very small slice of the electromagnetic spectrum, just the wavelengths that our eyes can see, which range from abo

Afbau principle, why exception is seen in lanthanoids why exception is seen in lanthanoids

Propertise, dithiazone. dithiazone.

Homologous, what do you mean by homologous series . what do you mean by homologous series .

Confirming compound separation by tlc., Every  precipitate will be collecte... Every  precipitate will be collected using a Hirsch funnel. Make definite that the plastic frit disc is firmly snapped in place in your focus.  Replacement frit discs are available

Resonance, Sometimes more than one valence structure is possible and there ... Sometimes more than one valence structure is possible and there shows to be no unique assignment. A familiar organic example is in the disposition of single and double C-C bonds in

Uses of polyglycolic & polylactic acid, Uses of Polyglycolic acid,Polylacti... Uses of Polyglycolic acid,Polylactic acid and Polyhydroxybutyrate PGA and PLA (90 : 10) is utilized to form absorbable structure to close an internal of external wound and has