how was chemistry paper 22

[Umar Zain]

i wrote the same thing

I think you should also mention why it is the biggest. Due to most number of electrons/electron shells.

 

[A star]

thanks man . My heart was in my throat when someone told me you had to draw em in pen

you can draw both this isnt inter board but it is better for pencil. read instruction you CAN use pencils for diagrams and graphs etc

 

[A star]

guys focus on other papers let it be discussing will not increase marks

 

[Umar Zain]

i hope for phosphprus too xD XD


dude y take risk with carbon when you know oxygen has a double bond -_-

Humm...is the question asking about double bond or pi bond? Only Group IV elements can form pi bonds due to sp3 hybridization

 

[A star]

Humm...is the question asking about double bond or pi bond? Only Group IV elements can form pi bonds due to sp3 hybridization

http://chemistry.about.com/od/chemistryglossary/g/Pi-Bond-Definition.htm check this

 

[Umar Zain]

Guys I wrote Na :/ not appreciating that a co-valent chloride was asked :/ and Al is wrong . I collected from diff Mark schemes that Na and Mg dissolve in water but Al to S all chlorides react!
It was v.v.tricky H seems to fit all the conditions, many of us would not even think of that!

Al & Be reacts with water to form hydrated ions. Not sure if HCl is covalent.

 

[syed1995]

i hope for phosphprus too xD XD


dude y take risk with carbon when you know oxygen has a double bond -_-

what was the question for the pi/double bond?

I think i either wrote N or O.

 

[A star]

Al & Be reacts with water to form hydrated ions. Not sure if HCl is covalent.

H is the only correct answer lost my one mark

 

[A star]

what was the question for the pi/double bond?

I think i either wrote N or O.

both are correct

 

[A star]

Al & Be reacts with water to form hydrated ions. Not sure if HCl is covalent.

dont argue over chem the only subject i will never admitt defeat on xD

 

[Umar Zain]

H is the only correct answer lost my one mark

Wait wait. I'm very sure it's Al/Be...but not sure for H

 

[A star]

Wait wait. I'm very sure it's Al/Be...but not sure for H

no almunium reacts in water AlCl3 reacts so does Be like a simple covalent chloride to form a complex how can some thing dissolve to form a complex?

 

[Umar Zain]

http://chemistry.about.com/od/chemistryglossary/g/Pi-Bond-Definition.htm check this

That is true. Therefore only Group IV elements can form pi bonds. Carbon for example has electron configuration of 1s2.2s2.2p2. The 2s2.2p2 orbital will hybridize into 1s.1p(x).1p.1p(z) or sp3. the p(z) hybridized orbital from two adjacent C atoms are parallel to each other. Hence form a pi bond. Can Oxygen undergoes the same hybridization?

 

[syed1995]

Wait wait. I'm very sure it's Al/Be...but not sure for H

LOL Al is correct.. I posted the quote from Wikipedia which proved it was correct a couple pages ago

 

[Umar Zain]

dont argue over chem the only subject i will never admitt defeat on xD

We still have MCQ and Practical to go. That's why I'm discussing(not arguing). The free ions of Al & Be chlorides conduct electricity

 

[syed1995]

no almunium reacts in water AlCl3 reacts so does Be like a simple covalent chloride to form a complex how can some thing dissolve to form a complex?

DUDE didn't ya saw the post I made a couple days back?

That's from Wikipedia. You can check on Aluminum Chloride page if you want...

 

[Umar Zain]

no almunium reacts in water AlCl3 reacts so does Be like a simple covalent chloride to form a complex how can some thing dissolve to form a complex?

It reacts/hydrolyse to from hydrated ions...but still ions

 

[A star]

partial hydrolysis man read partial hydrolysis . there are 50 percent of grade remaining hoping for excelent practical so i can relax for p1 xD

 

[syed1995]

That is true. Therefore only Group IV elements can form pi bonds. Carbon for example has electron configuration of 1s2.2s2.2p2. The 2s2.2p2 orbital will hybridize into 1s.1p(x).1p.1p(z) or sp3. the p(z) hybridized orbital from two adjacent C atoms are parallel to each other. Hence form a pi bond. Can Oxygen undergoes the same hybridization?

Study of Group IV elements isn't in the AS Level course. We have never studied about Group IV bonds in AS.. I am pretty sure you're giving it accelerated hence why you know about it. So I am damn sure O and N are correct. since those are the only ones which we have studied about which have double and triple bonds.

 

[syed1995]

partial hydrolysis man read partial hydrolysis . there are 50 percent of grade remaining hoping for excelent practical so i can relax for p1 xD

LOL