MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: R

There are no items in this cart.
Continue Shopping
Menu
Get instant 20% OFF on Online Material.
coupon code: MOB20 | View Course list

Get extra R 520 off
USE CODE: asksch20

				   

What is Latent Heat?


Also explain the Latent Heat of Fusion and Vaporisation!!!!!!!!!!!!!!


 

7 years ago

Share

Answers : (1)

										
Latent Heat



When a substance changes phase, that is it goes from either a solid to a liquid or liquid to gas, the energy, it requires energy to do so. The potential energy stored in the interatomics forces between molecules needs to be overcome by the kinetic energy the motion of the particles before the substance can change phase.



If we measure the temperature of the substance which is initially solid as we heat it we produce a graph like Figure(below).



Temperature change with time. Phase changes are indicated by flat regions where heat energy used to overcome attractive forces between molecules


Starting a point A, the substance is in its solid phase, heating it brings the temperature up to its melting point but the material is still a solid at point B. As it is heated further, the energy from the heat source goes into breaking the bonds holding the atoms in place. This takes place from B to C. At point C all of the solid phase has been transformed into the liquid phase. Once again, as energy is added the energy goes into the kinetic energy of the particles raising the temperature, (C to D). At point D the temperature has reached its boiling point but it is still in the liquid phase. From points D to E thermal energy is overcoming the bonds and the particles have enough kinetic energy to escape from the liquid. The substance is entering the gas phase. Beyond E, further heating under pressure can raise the temperature still further is how a pressure cooker works.


Latent Heat of Fusion and Vaporisation



The energy required to change the phase of a substance is known as a latent heat. The word latent means hidden. When the phase change is from solid to liquid we must use the latent heat of fusion, and when the phase change is from liquid to a gas, we must use the latent heat of vaporisation.



The energy require is Q= m L, where m is the mass of the substance and L is the specific latent heat of fusion or vaporisation which measures the heat energy to change 1 kg of a solid into a liquid.



Table show the
Latent Heat !!!!


                  

7 years ago

Post Your Answer

Other Related Questions on Physical Chemistry

WHAT ARE COLLOIDAL SOLUTIONS.............................?
 
 
DEAR VALI, COLLOIDAL SOLUTIONS: A HETEROGENEOUS BINARY SYSTEM IN WHICH PARTICLE SIZE 1 MILLI MICRO – 1 MICRO OF THE DISPERSED PHASE ARE DISTRIBUTED IN A CONTINUEOUS DISPERSION MEDIUMIS...
 
SAI SARDAR one month ago
for a reaction :nA=A n degree of dissociation when A trimerises is
 
 
@ shikha can u recall the ostwald law of dillution ?? 1 + @(n-1) = d/D where @ is alpha , if so, then put n=3 and find out the answer . The question given by you is correct , but none of...
 
Umakant biswal one month ago
I am unable to calculate the oxidation no. MOST OF THE TIME THE OXIDATION NO THAT I GET USING FORMULA IS NOT CORRECT. I HAVE TRIED TO CALCULATE OXIDATION NO USING STRUCTURE BUT HOW DO I...
 
 
@ bhavika Donot try to calculate the oxidation number by structure , formula one is very easy , u just need to remember some formula and rules . 1-The oxidation number of a free element is...
 
Umakant biswal one month ago
26 ml of CO2 is passed over red hot coke .the volume of CO involved is
 
 
THE Reaction would be: CO2 + C -------------> 2CO 26 ml V/2 V = 52 ml. This simply mole analysis in terms of Volume. rather than directly on moles. As the information is not provided the...
 
Vikas TU 5 days ago
Why is ch3cooh optically inactive it doesnt even have a plane of symetry and also its image do not superimpose it
 
 
Why is CH3COOH optically inactive? A molecule has a center of symmetry when for any atom in the molecule, an identical atom can be found when it moves in a straight line through this center ...
 
dolly bhatia 19 days ago
Why is graphite said to be thermodynamically more stable than diamond?
 
 
Graphite is sp2 hybridized, and the sp2 hybrid orbitals participate in covalent bond formation, the unhybridized p-orbital participates in pi-bonding. . Graphite has delocalized...
 
Umakant biswal one month ago
View all Questions »

  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: R 15,000
  • View Details
Get extra R 3,000 off
USE CODE: asksch20

Get extra R 520 off
USE CODE: asksch20

More Questions On Physical Chemistry

Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!!
Click Here for details