when lattice enthalpy becomes "less negative" what does it mean? Watch

medhelp
Badges: 14
Rep:
?
#1
Report Thread starter 1 year ago
#1
lattice enthalpy is the enthalpy change when 1 mole of gaseous ions form a solid compound right


and bond FORMATION is exothermic - it released energy
therefore lattice enthalpy is exothermic right ?


so if we say substance A has a "less negative" lattice enthalpy than substance B what does that mean?
does that mean less energy is released when its bonds are formed or does it mean more is releaseD?
idgi please explain




Spoiler:
Show

also i understand that
if a substance has a "more exothermic" lattice enthalpy
then its because it has more attraction bewteen its ions but thats around it and i don't get why LE would be more exothermic because of that

0
reply
Swissblade
Badges: 8
Rep:
?
#2
Report 1 year ago
#2
(Original post by medhelp)
lattice enthalpy is the enthalpy change when 1 mole of gaseous ions form a solid compound right

and bond FORMATION is exothermic - it released energy
therefore lattice enthalpy is exothermic right ?

so if we say substance A has a "less negative" lattice enthalpy than substance B what does that mean?
does that mean less energy is released when its bonds are formed or does it mean more is releaseD?
idgi please explain

Spoiler:
Show


also i understand that
if a substance has a "more exothermic" lattice enthalpy
then its because it has more attraction bewteen its ions but thats around it and i don't get why LE would be more exothermic because of that


If substance A has a less negative enthalpy than substance B, then substance A is the weaker of the two lattices. This is influenced by either the ionic radius or ionic charge.
0
reply
medhelp
Badges: 14
Rep:
?
#3
Report Thread starter 1 year ago
#3
(Original post by markschemes)
If substance A has a less negative enthalpy than substance B, then substance A is the weaker of the two lattices. This is influenced by either the ionic radius or ionic charge.
but how does having a less negative enthalpy indicate a weaker lattice?
0
reply
Swissblade
Badges: 8
Rep:
?
#4
Report 1 year ago
#4
(Original post by medhelp)
but how does having a less negative enthalpy indicate a weaker lattice?
I believe it's because it's closer to the theoretical value that's based on the perfect ionic model, which assumes lattices are perfectly spherical and have only ionic bonding, whereas the actual experimental values have slight covalent character and therefore have the stronger lattice and more negative lattice enthalpy (and vice versa).
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • University of Birmingham
    Postgraduate Open Day Postgraduate
    Wed, 20 Mar '19
  • King's College London
    Postgraduate Taught Courses - Arts & Sciences - Strand Campus Postgraduate
    Wed, 20 Mar '19
  • University of East Anglia
    All Departments Open 13:00-17:00. Find out more about our diverse range of subject areas and career progression in the Arts & Humanities, Social Sciences, Medicine & Health Sciences, and the Sciences. Postgraduate
    Wed, 20 Mar '19

Where do you need more help?

Which Uni should I go to? (17)
14.41%
How successful will I become if I take my planned subjects? (8)
6.78%
How happy will I be if I take this career? (24)
20.34%
How do I achieve my dream Uni placement? (19)
16.1%
What should I study to achieve my dream career? (14)
11.86%
How can I be the best version of myself? (36)
30.51%

Watched Threads

View All