Chemistry: Post your doubts here!

[qwertypoiu]

View attachment 60729pls answer this ques!
thanks in advance!

The hydrolysis will break the ester bond and the CONH (amide linkage)
I cannot see the question clearly because you have uploaded a low res pic.

 

[i_try9621]

After i find the total mass , how do I find the relative atomic mass ?

 

[The Sarcastic Retard]

View attachment 60743 After i find the total mass , how do I find the relative atomic mass ?

[(m/z * %abundance)1 + ...... + (m/z * %abundance)4]/100

 

[i_try9621]

[(m/z * %abundance)1 + ...... + (m/z * %abundance)4]/100

why divide by 100 ? i get the rest of the equation but I am confused why do we have to divide by 100.

 

[The Sarcastic Retard]

why divide by 100 ? i get the rest of the equation but I am confused why do we have to divide by 100.

Then temme, why u wont divide?

 

[i_try9621]

Then temme, why u wont divide?

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

 

[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?