Author Topic: Edexcel CHEMISTRY DOUBTS!!!!  (Read 253453 times)

Offline Deadly_king

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #435 on: October 19, 2010, 05:28:03 pm »
Ya so it's because of the More shielding that's caused by the P-orbital ..Nice 8)  

Thank u D :)

For Aluminium, it is the s-orbitals that shields the p-orbital since s-orbitals are smaller and closer to the nucleus. ;)

Anytime  :D
« Last Edit: October 20, 2010, 05:38:20 am by Deadly_king »

Offline The Golden Girl =D

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #436 on: October 19, 2010, 07:35:06 pm »
Aha Okay :)
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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #437 on: October 22, 2010, 05:19:55 pm »
Suggest why copper compounds are hazardous  ???   *Aslan they're hazardous :o :S *
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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #438 on: October 22, 2010, 05:22:10 pm »
ok CH4 + 2O2----> CO2 + 2H2O
     10cm^3            10cm^3

C2H6 + 2.5 O2 -----> 2CO2 + 3H2O 
10cm^3                    20cm^3

in total 30 cm^3 CO2 was released which reacted with alkali         

Quote
Quote from: ashish on October 09, 2010, 01:39:58 PM
ok CH4 + 2O2----> CO2 + 2H2O
     10cm^3            10cm^3

C2H6 + 2.5 O2 -----> 2CO2 + 3H2O  
10cm^3                    20cm^3

in total 30 cm^3 CO2 was released which reacted with alkali          
Yeah......Ashish is right

From the 1st equation we note that :
1 mole of CH4 burns completely on oxygen to form 1 mole of CO2
I mole is equal to 24dm3 = 24000cm3
Therefore 24000cm3 of methane produces 24000cm3 CO2
Hence 10 cm3 of methane will produce 10cm3 of CO2

Same principle is applied for ethane  

Total volume absorbed : 30cm3

THANK YOU GUYS SO MUCH!! :)



Thank you so much & I apologize for the late reply!

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #439 on: October 22, 2010, 06:20:54 pm »
Hey guys, I got a couple of questions here, I grouped them all together to just post it all in one time! LOL :D

1. Explain why the melting temperature of sodium is much lower than that of magnesium [3 marks]

2. State the type of structure and the nature of the bonding in each of the following elements: [6 marks]
 i) aluminium
 ii) silicon
 iii) chlorine

3. a) Using sodium chloride, hydrogen chloride and copper, explain what is meant by covalent, ionic and metallic bonding. [9 marks]

   b) Compare and explain the conduction of electricity by sodium chloride and copper in terms of structure and bonding. [6 marks]

4. Give 5 advantages of alloys. [5 marks]

THANKS A LOT IN ADVANCE! :)

Offline Deadly_king

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #440 on: October 22, 2010, 06:24:40 pm »
Suggest why copper compounds are hazardous  ???   *Aslan they're hazardous :o :S *



Hmm........i don't really know about it either :-[

I don't think you need to know about this according to the syllabus.

Anyway to satisfy your curiosity try this :
http://www.scorecard.org/chemical-profiles/summary.tcl?edf_substance_id=CNK750

Hope it helps :)

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #441 on: October 22, 2010, 06:34:15 pm »
Hmm........i don't really know about it either :-[

I don't think you need to know about this according to the syllabus.

Anyway to satisfy your curiosity try this :
http://www.scorecard.org/chemical-profiles/summary.tcl?edf_substance_id=CNK750

Hope it helps :)

Yes i don't :'(

satisfy my curiosity ? ..nah it came in the Quiz -__-

Anyways thx :)
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Offline Deadly_king

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #442 on: October 22, 2010, 06:36:26 pm »
Hey guys, I got a couple of questions here, I grouped them all together to just post it all in one time! LOL :D

1. Explain why the melting temperature of sodium is much lower than that of magnesium [3 marks]


That has already been partially answered in this same thread. Take a look.  :D

Unfortunately.............I need to go for now. But i'll help once am back ;)

Sorry for inconvenience.

Offline Deadly_king

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #443 on: October 22, 2010, 06:38:12 pm »
Yes i don't :'(

satisfy my curiosity ? ..nah it came in the Quiz -__-

Anyways thx :)

Oops.......I did not mean to be mean :-[

Sorry................i was not aware that it had something to do with your quiz :-\


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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #444 on: October 22, 2010, 06:41:03 pm »
I can elp tho it'll take time :S

D --> I know u meant good ...I'm sorry i was being stupid there .

Talk to you later iA :D
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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #445 on: October 22, 2010, 06:55:37 pm »
Hey guys, I got a couple of questions here, I grouped them all together to just post it all in one time! LOL :D

1. Explain why the melting temperature of sodium is much lower than that of magnesium [3 marks]

Magnesium has got 2 PROTONS , hence more nuclear charge .and since thery are in the same period they have same shielding *numebr of shells * ...SO  electrons on the shells are ATTRACTED to the proton MORE than Sodium's electrons are *Na has less number of proton , remember ;) *


2. State the type of structure ??? and the nature of the bonding in each of the following elements: [6 marks]
 i) aluminium --> Bonding nature - METALLIC
 ii) silicon --> Boning nature - GIANT COVALENT BOND
 iii) chlorine --> bonding nature - SIMPLE MOLECULAR *of course covalent ;) *

3. a) Using sodium chloride, hydrogen chloride and copper, explain what is meant by covalent, ionic and metallic bonding. [9 marks]

   b) Compare and explain the conduction of electricity by sodium chloride and copper in terms of structure and bonding. [6 marks]

4. Give 5 advantages of alloys. [5 marks]

THANKS A LOT IN ADVANCE! :)


That's what i got , my brain isn't working :S :S
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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #446 on: October 22, 2010, 07:00:45 pm »
That has already been partially answered in this same thread. Take a look.  :D

Unfortunately.............I need to go for now. But i'll help once am back ;)

Sorry for inconvenience.

Alright, I'll check that out!

& I'll be waiting for your replies!

No problem, its alright! :)

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #447 on: October 22, 2010, 07:11:39 pm »
Hey guys, I got a couple of questions here, I grouped them all together to just post it all in one time! LOL

1. Explain why the melting temperature of sodium is much lower than that of magnesium [3 marks]

Magnesium has got 2 PROTONS , hence more nuclear charge .and since thery are in the same period they have same shielding *numebr of shells * ...SO  electrons on the shells are ATTRACTED to the proton MORE than Sodium's electrons are *Na has less number of proton , remember  *

Magnesium has 24 PROTONS, but probably because when it's an ion it forms a +2 charge, it has a more positive charge compared to sodium which forms a +1 charge and hence, magnesium has a higher nuclear charge, so it'll attract more electrons, and hence more energy will be needed to break this force of attraction and hence, a higher melting temperature!

You just gave me an idea on how to write the answer!! Thank you!! :D


2. State the type of structure  and the nature of the bonding in each of the following elements: [6 marks]
 i) aluminium --> Bonding nature - METALLIC
 ii) silicon --> Boning nature - GIANT COVALENT BOND
 iii) chlorine --> bonding nature - SIMPLE MOLECULAR *of course covalent  *

I don't know what do they mean by "type of structure". It's a question from the textbook.

3. a) Using sodium chloride, hydrogen chloride and copper, explain what is meant by covalent, ionic and metallic bonding. [9 marks]

   b) Compare and explain the conduction of electricity by sodium chloride and copper in terms of structure and bonding. [6 marks]

4. Give 5 advantages of alloys. [5 marks]

THANKS A LOT IN ADVANCE!


Thank you for your help!! :)

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #448 on: October 22, 2010, 07:14:18 pm »
np :)
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Offline Deadly_king

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #449 on: October 23, 2010, 04:50:39 am »
I can elp tho it'll take time :S

D --> I know u meant good ...I'm sorry i was being stupid there .

Talk to you later iA :D

No.......you were not being stupid. Actually I need to apologise since my words were quite offensive :-[

Sorry again :-\

Anyway seems you understood the trend of melting point across period 3 well ;)
That was a 5 star explanation :D

No worries...............i'll take on the rest :)
« Last Edit: October 23, 2010, 04:53:29 am by Deadly_king »