Question

What are the favourable conditions for the melting of ice?

Answer 1

HT,HP
HT,LP
LT,HP
LT,LP

Answer 2

its definitely high temperature but what about pressure..?

Answer 3

HP wont allow the molecules to breakthrough from vander vall's forces i guess so wont melt easily..
i'd say HT,LP

Answer 4

ITS HP HT!!

Answer 5

HP will favour ice melting because liquid water occupies less space than ice does.

Answer 6

hmmm.. :/

Answer 7

sir please elaborate ?

Answer 8

exactly

Answer 9

i was just trying to compare with KTOG , is there a flaw in my logic ?
i mean ofcorse there is flaw..whats the flaw ?

Answer 10

Have a look at water's phase diagram.
You will see that to go from solid to liquid, you will have to go right or/and up.

http://serc.carleton.edu/images/research_education/equilibria/h2o_phase_diagram_-_color.v2.jpg

Answer 11

alright, the experimental data favors your conclusion, i didnt understand the logic :
" HP will favour ice melting because liquid water occupies less space than ice does."

Answer 12

exactly

Answer 13

I could have said: density of water is greater than density of ice.

Answer 14

then why HP ?

Answer 15

relation between HP and space occupied ?

Answer 16

exactly

Answer 17

Reason 1 is in the sign of dP/dT along the solidification curve.
Reason of reason 1 is in the Clapeyron relation.
http://en.wikipedia.org/wiki/Clausius%E2%80%93Clapeyron_relation

Answer 18

so if i say, to convert any matter from 1 state to another, if the latter one occupies more space than former, HP would favor it.. ?

Answer 19

exactly

Answer 20

you can say like this..

Answer 21

Solid(higher volume)<==>Liquid(lower volume)
Solis whose volume decreases on melting.example..ice..diamond..carborudnum..magnesium nitride and quartz..
the process of melting is facilitated at HP..thus melting point becmes high..melting point lowers..

Answer 22

\[Volume = \frac{k}{pressure}\]

Answer 23

n,t =constant..

Answer 24

now think about it

Answer 25

volume kam hogi..solids=>liquids
pressure zada denge to zada ice formation hoga

Answer 26

density of ice< density of water

volume = mass/density
for same mass,
volume of ice is more,

hence at constant temp, pressure of ice is less than water
ice -> water
p1 p2

p1 < p2

pressure increases.
according to le chatliers principle, shouldnt decreasing pressure or LP favor the process ?

Answer 27

H2O(s)===>H2O(l)
less pressure ===>high pressure
reaction has to go forward..
oh yes :p

Answer 28

there is some mistake 110% in our logic,,damn we are pathetic in studies! :(

Answer 29

:'(

Answer 30

Solid===>Liquid
high temp===>low temp
so u would say less temperature favours melting? O.O

Answer 31

ice -> water
temp doesnt change..
temp changes only after 100% ice is melted to water, otherwise its constant at 0 degree

Answer 32

:/

Answer 33

I do not understand your discussion.

The temperature and the pressure mentioned are the external P and T imposed to a compound.
They correspond to a point in the phase diagram. If the point is in an area with a certain stable state and if the body is actually in another state, then it is out of equilibrium and its state will evolve, provided there is enough energy available to do so.

Answer 34

So melting of ice will be all the more easy if you increase temperature and pressure \( \textit {of the environment}\).

Boiling of water will be easier if y ou increase temperature and/or decrease pressure \( \textit {of the environment}\)..

Answer 35

i seem to get a hang of it..thanks a lot for your time sir! :)

Answer 36

IM LOST

Answer 37

in layman terms, this can be seen as HP would mean pushing molecules more inside right, which does explain boiling..right ?

Answer 38

look at it this way. density of ice < density of water. which tells us that in the same volume V, we have more molecules of water than ice.
ie, Mi < Mw
where Mi = no of molecules of ice in volume V
Mw = no of molecules of water in V
so, to convert ice into water, we have to INCREASE the no of molecules in the given volume. how do u do that? by pushing them inside. in other words, INCREASING the PRESSURE.
get it?

Answer 39

processing

Answer 40

i see..layman language me mujhe samjh aa gaya! cool.. B|

Answer 41

what u explained seems kinda jugaadu o.O
is that the real reason?

Answer 42

if that is real then what is what vincent explained ._.

Answer 43

sir explained the scientific reasoning. i just made the language simpler. both are actual facts.

Answer 44

i didnt understand what he said :/

Answer 45

thats why i used simpler language. u understood what happens, right? thats enough then.

Answer 46

:/ okay