Suggest why the melting point of sodium Iodide is lower than the melting point of...

Watch
Qxi.xli
Badges: 20
Rep:
?
#1
Report Thread starter 6 months ago
#1
of Sodium Bromide.. (1)

The answer: Iodine is bigger

My thoughts: That's a stupid answer. I thought about this way too much for that to be correct. Iodine is less electronegative then Br. So, there's a greater difference in electronegativity btwn Na and Br than Na and I. Weaker permanent dipole dipole forces btwn Na-I molecules.

Also what does being a bigger molecules have to do with lower melting point? its not the bonds that we are breaking, right? only the IMF....
0
reply
iceberg5
Badges: 9
Rep:
?
#2
Report 6 months ago
#2
Have a think about the type of bonding you're concerned with here...
1
reply
Aloe Striata
Badges: 19
Rep:
?
#3
Report 6 months ago
#3
(Original post by vix.xvi)
of Sodium Bromide.. (1)

The answer: Iodine is bigger

My thoughts: That's a stupid answer. I thought about this way too much for that to be correct. Iodine is less electronegative then Br. So, there's a greater difference in electronegativity btwn Na and Br than Na and I. Weaker permanent dipole dipole forces btwn Na-I molecules.

Also what does being a bigger molecules have to do with lower melting point? its not the bonds that we are breaking, right? only the IMF....
have you studied polarization yet? and it's effects on melting and boiling points?
P.S. I know we're not supposed to tell answers, just asking in case vix.xvi hasn't studied it yet
1
reply
Aloe Striata
Badges: 19
Rep:
?
#4
Report 6 months ago
#4
oh wait sorry forget what I just said
0
reply
Qxi.xli
Badges: 20
Rep:
?
#5
Report Thread starter 6 months ago
#5
(Original post by iceberg5)
Have a think about the type of bonding you're concerned with here...
oh **** its ionic isnt it

jeez this is annoying lollll

So cuz I is bigger the electrostatic forces are weaker.... i see

thanks for ur help guysss xxx srsly appreciate it

(Original post by TrES2b)
if I'm not mistaken the ionic bonds are broken
(Original post by ilovephysmath)
have you studied polarization yet? and it's effects on melting and boiling points?
P.S. I know we're not supposed to tell answers, just asking in case vix.xvi hasn't studied it yet
hmmm like polar molecules? xx
0
reply
Aloe Striata
Badges: 19
Rep:
?
#6
Report 6 months ago
#6
ahhh but hold on... remember how you must've studied in IGCSE or GCSE that ionic compounds conduct when their in solution or MOLTEN? that's because the bonds break and they can move about freely even when they melt I think
0
reply
Qxi.xli
Badges: 20
Rep:
?
#7
Report Thread starter 6 months ago
#7
(Original post by ilovephysmath)
ahhh but hold on... remember how you must've studied in IGCSE or GCSE that ionic compounds conduct when their in solution or MOLTEN? that's because the bonds break and they can move about freely even when they melt I think
oohh yeahh

haha its all coming together now

thanks!
0
reply
Aloe Striata
Badges: 19
Rep:
?
#8
Report 6 months ago
#8
(Original post by vix.xvi)
hmmm like polar molecules? xx
basically, the iodide ion is larger so the forces of attraction between it's protons and electrons are weak while the sodium ion is small and is positively charged so it attracts the iodide ion's electron cloud and polarizes the iodide ion. the compound isn't completely ionic anymore. it has some covalent character which results in a decrease in it's melting point. are you in GCSE or a levels? if you're doing your GCSEs you don't need to know this
Last edited by Aloe Striata; 6 months ago
0
reply
Qxi.xli
Badges: 20
Rep:
?
#9
Report Thread starter 6 months ago
#9
(Original post by ilovephysmath)
basically, the iodine ion is larger so the forces of attraction between it's protons and electrons are weak while the sodium ion is small and is positively charged so it attracts the iodide ion's electron cloud. the compound isn't completely ionic anymore. are you in GCSE or a levels?
a level xx
0
reply
Aloe Striata
Badges: 19
Rep:
?
#10
Report 6 months ago
#10
(Original post by vix.xvi)
a level xx
oh alright. I edited my post, hopefully it'll make more sense now.
0
reply
Aloe Striata
Badges: 19
Rep:
?
#11
Report 6 months ago
#11
if you still need help, quote me here and I'll be back
0
reply
iceberg5
Badges: 9
Rep:
?
#12
Report 6 months ago
#12
(Original post by vix.xvi)
oh **** its ionic isnt it

jeez this is annoying lollll

So cuz I is bigger the electrostatic forces are weaker.... i see

thanks for ur help guysss xxx srsly appreciate it




hmmm like polar molecules? xx
If you do go on to study (Pauling) electronegativity, the confusion surrounding the type of bonding between these atoms should clear up a little. Have a research online perhaps
0
reply
Qxi.xli
Badges: 20
Rep:
?
#13
Report Thread starter 6 months ago
#13
(Original post by ilovephysmath)
basically, the iodide ion is larger so the forces of attraction between it's protons and electrons are weak while the sodium ion is small and is positively charged so it attracts the iodide ion's electron cloud and polarizes the iodide ion. the compound isn't completely ionic anymore. it has some covalent character which results in a decrease in it's melting point. are you in GCSE or a levels? if you're doing your GCSEs you don't need to know this
oooh makes a bitmore sense now. Thanks
(Original post by ilovephysmath)
oh alright. I edited my post, hopefully it'll make more sense now.
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
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

Poll: What factors affect your mental health most right now? Post-lockdown edition

Anxiousness about restrictions easing (28)
5.57%
Uncertainty around my education (58)
11.53%
Uncertainty around my future career prospects (60)
11.93%
Lack of purpose or motivation (66)
13.12%
Lack of support system (eg. teachers, counsellors, delays in care) (28)
5.57%
Impact lockdown had on physical health (22)
4.37%
Social worries (incl. loneliness/making friends) (53)
10.54%
Financial worries (30)
5.96%
Concern about myself or my loves ones getting/having been ill (20)
3.98%
Exposure to negative news/social media (32)
6.36%
Difficulty accessing real life entertainment (15)
2.98%
Lack of confidence in making big life decisions (49)
9.74%
Worry about missed opportunities during the pandemic (42)
8.35%

Watched Threads

View All