Chemistry: Post your doubts here!

[Scafalon40]

aoa wr wb!
in that case, you definitely would have received a warning...
Did you?

So you removed that post?
Man I could've sworn it would have been somebody like Nibz!
So did you like that joke
By the way, why did you remove it? You could've just locked it.

 

[Nibz]

So you removed that post?
Man I could've sworn it would have been somebody like Nibz!

Bugger off, man. Don't spoil the flow.

 

[smartangel]

isnt the bond between Cl-Cl covalent???
n da bond between Cl2-Cl2 vanderwalls????

im not sure but how is this related to my question.. do you knw how to answer that one?

 

[XPFMember]

So you removed that post?
Man I could've sworn it would have been somebody like Nibz!
So did you like that joke
By the way, why did you remove it? You could've just locked it.

That's the reason...remember never to suspect someone until you have a proof

When you could joke, then I can act smart enough to remove that thread completely

anyway better not go off-topic.

 

[alphabravocharlie]

Q12. SiCl4 + 2H20 -> SiO2 + 4HCl (normal reaction which is in syllabus of Period 3 elements)
SiO2 is white solid (so white ppt) and HCl is acidic so acidic solution.

Hmh i thought you got Si[oh]4 when you dissolved SiCl4 in water

 

[Nibz]

Yes, sorry. My bad! Wrote that in a hurry. There were too many questions and very little time. The answer still stays the same because the important point is the dissolution of HCl in water

 

[XPFMember]

Hmh i thought you got Si[oh]4 when you dissolved SiCl4 in water

Yes, sorry. My bad! Wrote that in a hurry. There were too many questions and very little time. The answer still stays the same because the important point is the dissolution of HCl in water

chemguide says
These are also called silicon(IV) chloride, germanium(IV) chloride and tin(IV) chloride.
Silicon tetrachloride reacts violently with water to give white solid silicon dioxide and steamy fumes of HCl.

 

[Nibz]

NO, I WAS RIGHT. YOU CONFUSED ME, ALPHA

 

[smzimran]

chemguide says
These are also called silicon(IV) chloride, germanium(IV) chloride and tin(IV) chloride.
Silicon tetrachloride reacts violently with water to give white solid silicon dioxide and steamy fumes of HCl.

AoA
Where do i get chemguide frm?
and other subbjects too?

 

[XPFMember]

NO, I WAS RIGHT. YOU CONFUSED ME, ALPHA

calm down...it's ok ...!!!!
i remember, in the intermediate step, Si(OH)4 is formed!
but in the final step SiO2 is formed....

 

[Nibz]

AoA
Where do i get chemguide frm?
and other subbjects too?

It's a site, dude. Here: http://www.chemguide.co.uk/

 

[XPFMember]

AoA
Where do i get chemguide frm?
and other subbjects too?

Waalaikumassalam wr wb!

chemguide...i was talking about the website..
http://www.chemguide.co.uk/CIE/section93/learningc.html#top

 

[XPFMember]

It's a site, dude. Here: http://www.chemguide.co.uk/

You hadn't made the post when I clicked reply..

 

[smzimran]

Waalaikumassalam wr wb!

It's a site, dude. Here: http://www.chemguide.co.uk/

chemguide...i was talking about the website..
http://www.chemguide.co.uk/CIE/section93/learningc.html#top

Oh, sorry...
Btw, Is there any revision guide or revision checklist published by CIE ?

 

[Nibz]

Oh, sorry...
Btw, Is there any revision guide or revision checklist published by CIE ?

Check here: http://www.cambridgestudents.org.uk/subjectpages

 

[smartangel]

7 Which pair of elements have bonds of the same type between their atoms in the solid state?
A aluminium and phosphorus
B chlorine and argon
C magnesium and silicon
D sulphur and chlorine

why is the answer D and not A or B?

 

[smzimran]

7 Which pair of elements have bonds of the same type between their atoms in the solid state?
A aluminium and phosphorus
B chlorine and argon
C magnesium and silicon
D sulphur and chlorine

why is the answer D and not A or B?

AoA,
Not A because Aluminium has metallic bonding while Phosphorus has a simple molecular struture with covalent bonds and Van der Waals forces
Not B because chlorine is diatomic (covalent bonding) while argon is a noble gas : monoatomic
Not C because Mg has metallic bonding while Silicon has covalent bonds
It is D because both have molecular structure with covalent bonds

 

[smartangel]

AoA,
Not A because Aluminium has metallic bonding while Phosphorus has a simple molecular struture with covalent bonds and Van der Waals forces
Not B because chlorine is diatomic (covalent bonding) while argon is a noble gas : monoatomic
Not C because Mg has metallic bonding while Silicon has covalent bonds
It is D because both have molecular structure with covalent bonds

thank you . plz explain these too.. http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s11_qp_12.pdf
in Q6..shouldnt Y be higher as the peak increases when temp is reduced?
and plz explain Q 11, 19,23 as well!

 

[alphabravocharlie]

Yes, sorry. My bad! Wrote that in a hurry. There were too many questions and very little time. The answer still stays the same because the important point is the dissolution of HCl in water

Well yeah hcl is important

NO, I WAS RIGHT. YOU CONFUSED ME, ALPHA

You do have a short temper jk
Chill, Sicl4 dissolved in water can form: Sio2, Si[OH]4, H2SiO3, etc, And i got that from the past papers

 

[Nibz]

7 Which pair of elements have bonds of the same type between their atoms in the solid state?
A aluminium and phosphorus
B chlorine and argon
C magnesium and silicon
D sulphur and chlorine

why is the answer D and not A or B?

A wrong. Metallic - covalent
B wrong. Covalent - (mono atomic) or van der Waals
C wrong. metallic - covalent
D Right. Covalent - Covalent