Chemistry: Post your doubts here!

[Starlight97]

can we self study chemistry

 

[princess Anu]

Hi, is it true to say : Addition polymers have monomers that are alkenes, and condensation polymers have monomers that are not alkenes, but that have two functional groups per molecule.?
Like if I was given a monomer, and asked if it will form addition or condensation polymers, if I see an alkene functional group ( double bond ) can I straight away conclude that it will give addition polymers?

Yes,you are right.
And for condensation polymers there must be a functional group on both ends of the monomers for example for nylon the monomers are DIamine and DIcarboxylic acid and they both have functional groups at both ends.

 

[Thought blocker]

can we self study chemistry

Hell yes, where are you? We have to discuss chemistry today. :/

 

[princess Anu]

Q:Write out the ground state electronic configuration, using the s and p notation , of the following atoms.
Carbon - 1s^2 2s^2 2p^2
Argon 1s^2 2s^2 2p^6 3s^2 3p^4

Why ain't they correct? ^

 

[Thought blocker]

Q:Write out the ground state electronic configuration, using the s and p notation , of the following atoms.
Carbon - 1s^2 2s^2 2p^2
Argon 1s^2 2s^2 2p^6 3s^2 3p^4

Why ain't they correct? ^

Carbon is correct.
Argon is [Ne]3s23p6

 

[princess Anu]

how? what's Ne? isn't it the symbol for Neon?

 

[Thought blocker]

how? what's Ne? isn't it the symbol for Neon?

What how?
Yes it is the symbol for Neon.
[Ne]3s23p6, here [Ne] means electronic config of Neon.

 

[princess Anu]

What how?
Yes it is the symbol for Neon.
[Ne]3s23p6, here [Ne] means electronic config of Neon.

Sorry I'm new to this.. can you please explain why are we using Neon while working for Argon?

 

[Thought blocker]

Sorry I'm new to this.. can you please explain why are we using Neon while working for Argon?

Read chapter 3 from Roger Norris book. Page 40
Else,
We can do this for any element, BUT, we must use only noble gases in the brackets. I call this thenoble gas simplification. In this method of writing electron configurations, the last noble gas before we get to the element of interest is the noble gas we put into the brackets. For instance, for the element aluminum we write

Sulfur [Ne]3s23p4
Chlorine [Ne]3s23p5
Argon[Ne]3s23p6
Potassium[Ar]4s1
Calcium[Ar]4s2
We may NOT use any element in the brackets, only noble gases.

 

[princess Anu]

Read chapter 3 from Roger Norris book. Page 40
Else,
We can do this for any element, BUT, we must use only noble gases in the brackets. I call this thenoble gas simplification. In this method of writing electron configurations, the last noble gas before we get to the element of interest is the noble gas we put into the brackets. For instance, for the element aluminum we write

Sulfur [Ne]3s23p4
Chlorine [Ne]3s23p5
Argon[Ne]3s23p6
Potassium[Ar]4s1
Calcium[Ar]4s2
We may NOT use any element in the brackets, only noble gases.

Actually i don't have that book I'll buy it soon In sha Allah.
Can you please specify a reason for using the last noble gas?
is that true that last noble gas electronic configuration will be similar to the initial electronic comfiguration of the next element therefore we use them in brackets? I'm just guessing, correct me if I'm wrong..

JazakAllah.

 

[Thought blocker]

Actually i don't have that book I'll buy it soon In sha Allah.
Can you please specify a reason for using the last noble gas?
is that true that last noble gas electronic configuration will be similar to the initial electronic comfiguration of the next element therefore we use them in brackets? I'm just guessing, correct me if I'm wrong..

JazakAllah.

Yeah, not next element, but the next period until other Noble gas.
Didn't you got that explanation?

 

[emma914]

someone help me on how to get the order of a reaction

 

[emma914]

Does anyone have compiled questions on different topics for A2 Chemistry?

 

[princess Anu]

Yeah, not next element, but the next period until other Noble gas.
Didn't you got that explanation?

for the entire period?
I got it now.

 

[Thought blocker]

for the entire period?
I got it now.

Good luck.

 

[Duaa Akhtar]

Hey can I get an A* in chem if I got A in P1 and P2 but D in practical? and how plzzzzz???

 

[Zepudee]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w13_qp_43.pdf

guys, how to do Q6 (f) (iii) ?

 

[Awesome12]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w13_qp_43.pdf

guys, how to do Q6 (f) (iii) ?

The structure already shows CH3 and H.
You need to complete it using the following:
H2N
HO2C
H
OH

 

[ahmedgamal986]

what is the answer ?
please ..... this is o-level not AL question
thanks in advance

 

[Zepudee]

The structure already shows CH3 and H.
You need to complete it using the following:
H2N
HO2C
H
OH

Just simply? And btw the up there, there is one more question, why is it J? Why is it not G?