Chemistry: Post your doubts here!

[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?

 

[AbbbbY]

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

Depends paper to paper. Although practical is around 13% of the grade, it CAN cause a drop from an A* to an A. Best to prepare well for P4 and ace it (which is almost impossible). I screwed up a single question in my P4. Worth about 7-8 marks. Dropped that and around 3-4 others in the entire P4. Had a 60/60 P2. All components were A yet I didn't have an A*, so it depends on the percentile, really. People lose a lot of marks in P5 and P1.

 

[princess Anu]

What's the reason for Sodium and group 1 elements having a low melting point?

 

[Awesome12]

What's the reason for Sodium and group 1 elements having a low melting point?

When you go down the group, there will be more orbital shells. Thus, the outer-most (valence) electron shell will be subject to less electrostatic force attraction from the nucleus. Therefore, the valence electrons would be more free to move about. Metallic bonding is the force of attraction between the nucleus and the 'sea' of electrons, so the increased mobility of the valence electrons as it descends down the group will result in a weaker force of attraction. Thus, less energy will be required to overcome the forces of attraction.

 

[Dark Destination]

When you go down the group, there will be more orbital shells. Thus, the outer-most (valence) electron shell will be subject to less electrostatic force attraction from the nucleus. Therefore, the valence electrons would be more free to move about. Metallic bonding is the force of attraction between the nucleus and the 'sea' of electrons, so the increased mobility of the valence electrons as it descends down the group will result in a weaker force of attraction. Thus, less energy will be required to overcome the forces of attraction.

Doesn't answer her question.

 

[Awesome12]

Doesn't answer her question.

Enna tu Post-Corrector

 

[Dark Destination]

Enna tu Post-Corrector

Ena tu Nawaz Sharif.

The question was why do group 1 metals have low melting points, compared to other metals like Iron?

So what is your answer, Chemistry master?