Chemistry: Post your doubts here!

[qwertypoiu]

I do understand why we have to divide , but why chose to divide by 100 is my doubt.

Because percentage means divide by 100.

 

[krishnapatelzz]

why so lonely here! start asking doubts

 

[Thought blocker]

why so lonely here! start asking doubts

lol

 

[ValeriaMGD]

Hi, I'm taking AS & A Level Chemistry in Oct/Nov. I'm self teaching as a private candidate. So far, so good except for the practical thing.
Can somebody give me a guideline on the "usual" ezperiments? Like a list of experiments/procedures I should be familiar with. I've been watching videos about titration and identifying ions. Any help would be very much appreciated

 

[Rizwan Javed]

Hi, I'm taking AS & A Level Chemistry in Oct/Nov. I'm self teaching as a private candidate. So far, so good except for the practical thing.
Can somebody give me a guideline on the "usual" ezperiments? Like a list of experiments/procedures I should be familiar with. I've been watching videos about titration and identifying ions. Any help would be very much appreciated

Read out the tips given on the following page:
http://www.gceguide.com/resources/notes/chemistry-9701/as-level-practical-paper-3/
I hope these tips will help you

 

[Arsalan Shah]

Which solid contains more than one type of bonding??
A. Copper
B. Diamond
C. Ice
D. Magnesium oxide

 

[Rizwan Javed]

Which solid contains more than one type of bonding??
A. Copper
B. Diamond
C. Ice
D. Magnesium oxide

Copper contains only metallic bonding between the cations.
Diamond contains extensive convalent bonding between the carbon atoms.
Ice (Solid form of H2O) contains both convalent bonding between the atoms, and hydrogen bonding between the molecules.
Magnesium oxide contains only ionic bonding between its ions.

So the correct option is C.

 

[iSean97]

Toughest Question in AS Chemistry M/J 16 QP22

I analysed based on my understand, they should be 3 possible answers....
Na/Mg/Cl.


IE of … | log 10
fith |6542 |3.82E+00
sixth| 9362 |3.97E+00
seveth| 11018 |4.04E+00
eighth| 33606 |4.53E+00

 

[Thought blocker]

View attachment 60900
Toughest Question in AS Chemistry M/J 16 QP22

I analysed based on my understand, they should be 3 possible answers....
Na/Mg/Cl.


IE of … | log 10
fith |6542 |3.82E+00
sixth| 9362 |3.97E+00
seveth| 11018 |4.04E+00
eighth| 33606 |4.53E+00

Were we asked to identify the element?

 

[Dark Destination]

View attachment 60900
Toughest Question in AS Chemistry M/J 16 QP22

I analysed based on my understand, they should be 3 possible answers....
Na/Mg/Cl.


IE of … | log 10
fith |6542 |3.82E+00
sixth| 9362 |3.97E+00
seveth| 11018 |4.04E+00
eighth| 33606 |4.53E+00

They just asked us to identify group number, which is clearly 7 because of huge difference between 7th and 8th Ionisation energy.

 

[Sariya Khan]

View attachment 60900
Toughest Question in AS Chemistry M/J 16 QP22

I analysed based on my understand, they should be 3 possible answers....
Na/Mg/Cl.


IE of … | log 10
fith |6542 |3.82E+00
sixth| 9362 |3.97E+00
seveth| 11018 |4.04E+00
eighth| 33606 |4.53E+00

That's not the toughest!

 

[Sariya Khan]

They just asked us to identify group number, which is clearly 7 because of huge difference between 7th and 8th Ionisation energy.

Exactly.

 

[Rizwan Javed]

Exactly.

Exactly. Only group No.

 

[Kolbalish]

In which species does the underlined atom have an incomplete outer shell?
A - Al2Cl6 (Al underlined)
B - CH3+ (C underlined)
C - Cl2O (O underlined)
D - H2ClC (Cl underlined)
M/J/12(12) Q.4
Answer is B, how?

 

[Thought blocker]

In which species does the underlined atom have an incomplete outer shell?
A - Al2Cl6 (Al underlined)
B - CH3+ (C underlined)
C - Cl2O (O underlined)
D - H2ClC (Cl underlined)
M/J/12(12) Q.4
Answer is B, how?

how many electrons does C have in CH3+ ?

 

[phanttasy]

In which species does the underlined atom have an incomplete outer shell?
A - Al2Cl6 (Al underlined)
B - CH3+ (C underlined)
C - Cl2O (O underlined)
D - H2ClC (Cl underlined)
M/J/12(12) Q.4
Answer is B, how?

 

[Raja2396]

Can anybody help me, if one has these components in Chem 9701 P1 B P2 A P3 B P4 A P5 C, what grade should he expect B or A?

 

[Raja2396]

Hi everyone, AsSalamoAlaikum Wr Wb..

To get things organized in a better way, I am making this thread. As othewise, some queries remain unanswered!

So post your CHEMISTRY doubts in this thread. InshaAllah members around will help you.

Any Chemistry related notes and links will be added here in this post. Feel free to provide the links to your notes around the forum, or any other websites!

Chemistry Notes:


http://www.chemguide.co.uk This is the website, which contains almost everything classified according to the syllabus.

Tips for solving chemistry MCQs 9701/01

Chemistry P5 Tips and Notes

Some links & Notes - by 'destined007'

Chemistry worksheets Link shared by hassam

Chemistry Application Booklet: Mistakes and Corrections!

Calculations for A level Chemistry, author E.N. Ramsden third edition ebook download.


Regards,
XPC Staff.

Can you provide me notes for A2 organic chemistry new syllabus notes? any mind map for organic reactions?

 

[Thought blocker]

Can you provide me notes for A2 organic chemistry new syllabus notes? any mind map for organic reactions?

Check the first link in BLUE below this post in my signature. Check there in chemistry module. ^_^ And do like and vote if u think that notes helped u

 

[Thought blocker]

Can anybody help me, if one has these components in Chem 9701 P1 B P2 A P3 B P4 A P5 C, what grade should he expect B or A?

It depends on what B's and C's u get, if both are higher then u get A if lower then B