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Author Topic: Edexcel CHEMISTRY DOUBTS!!!!  (Read 253914 times)

Offline Igcseboy

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #195 on: May 20, 2010, 07:52:33 pm »
Quote from: vanibharutham on May 20, 2010, 07:49:34 pm
boiling poitn shouldnt be confused with Ioinisation energy

neon has a higher ionization energy becasuse force of attractio between nucleus and electrons is much more...but krypton has a much higher boiling point because of the IM forces involved - it has many more and stronger vdw forces than neon and so higher boiling point

ok thanxx aloot!! :)

so whenever it boliling or melting points we will consider IM force rite ????
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Offline Kim

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #196 on: May 20, 2010, 07:55:14 pm »
Quote from: Igcseboy on May 20, 2010, 07:52:33 pm
ok thanxx aloot!! :)

so whenever it boliling or melting points we will consider IM force rite ????

only for boiling point
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Offline Igcseboy

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #197 on: May 20, 2010, 07:56:58 pm »
Quote from: kim on May 20, 2010, 07:55:14 pm
only for boiling point


and melting point??
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Offline Igcseboy

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #198 on: May 20, 2010, 07:59:44 pm »
why melting point for boron trichloride is much lower than sodium chloride??
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Offline Kim

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #199 on: May 20, 2010, 08:10:41 pm »
i seriously dunno
shudnt boron have a higher bp then na???
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Offline vanibharutham

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #200 on: May 20, 2010, 08:11:05 pm »
NaCl ionic
BCl3 covalent with only weaker Im forces
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Offline Kim

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #201 on: May 20, 2010, 08:12:44 pm »
Quote from: vanibharutham on May 20, 2010, 08:11:05 pm
NaCl ionic
BCl3 covalent with only weaker Im forces

isnt boron a metal??
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Offline vanibharutham

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #202 on: May 20, 2010, 08:13:46 pm »
BCl3 is still covalent compound
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Offline Kim

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #203 on: May 20, 2010, 08:14:36 pm »
Quote from: vanibharutham on May 20, 2010, 08:13:46 pm
BCl3 is still covalent compound

ok thanks
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Offline vanibharutham

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #204 on: May 20, 2010, 08:19:25 pm »
any other doubts ppl?
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Offline Igcseboy

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #205 on: May 20, 2010, 08:20:27 pm »
Quote from: vanibharutham on May 20, 2010, 08:19:25 pm
any other doubts ppl?

if we have to compare melting points how will we ????
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Offline vanibharutham

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #206 on: May 20, 2010, 08:28:07 pm »
doubt you will have to worry about that in Unit 1

just think off types of bonds

ionic bonds, metallic bonds, intermolecular forces, covalent bonds etc
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Offline Igcseboy

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #207 on: May 20, 2010, 08:32:59 pm »
Quote from: vanibharutham on May 20, 2010, 08:28:07 pm
doubt you will have to worry about that in Unit 1

just think off types of bonds

ionic bonds, metallic bonds, intermolecular forces, covalent bonds etc


i didnt get ur first sentence but the rest i got it thanxxx
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Offline Meticulous

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #208 on: May 20, 2010, 08:44:20 pm »
What's the difference between thermodynamic and kinetic stability?
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Offline Kim

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #209 on: May 20, 2010, 08:56:07 pm »
Quote from: The Gladiator on May 20, 2010, 08:44:20 pm
What's the difference between thermodynamic and kinetic stability?

although u dont need it for unit 1 but ill tell ya
kinetic stability is wen the activation energy is very high  and the number of colliding particles that possess that energy is very less so the reaction will not take place.this type of system is called as kinetically stable

thermodynamic stabilty is wen the reaction is very exothermic and so will take place as heat is given out
the products are said to be thermodynamically stable
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After all is said and done, more is said than done.

By the time a man realizes that maybe his father was right, he usually has a son who thinks he’s wrong.

The early bird may get the worm, but the second mouse gets the cheese.
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