Chemistry: Post your doubts here!

[amina1300]

Yes, i guess its mostly dnph or tollens reagent to test for carbonyl group

Thankss

 

[amina1300]

What sequence for gas tests should be taken???

 

[selrey]

Guys do we have to wash the conical flask before performing the next titration or nah?

 

[ahmadrr]

Please can anybody help me with these question . I cant able to understand them. Question 20 in first screenshot and question 10 in the second one .thanks

 

[selrey]

Please can anybody help me with these question . I cant able to understand them. Question 20 in first screenshot and question 10 in the second one .thanks

Can you tell me the answers?

 

[sarmadimran]

Please can anybody help me with these question . I cant able to understand them. Question 20 in first screenshot and question 10 in the second one .thanks

question 20 C? and q10 A?

 

[Awoudam]

question 20 C? and q10 A?

Q 20 C

 

[Zaki ali asghar]

question 20 C? and q10 A?

for Q 10 B and D are wrong as there is no change in oxidation state,C cant be correct as an acid must have H+ ions so A is the answer

 

[selrey]

Please can anybody help me with these question . I cant able to understand them. Question 20 in first screenshot and question 10 in the second one .thanks

In q20 you have to look for the longest chain. And in this qs longest chain contains 5 carbons. Start numbering from the carbon closest to the functional group so ans is C

 

[ahmadrr]

Can you tell me the answers?

Can you tell me the answers?

10 :A and 20:C

 

[Awoudam]

for Q 10 B and D are wrong as there is no change in oxidation state,C cant be correct as an acid must have H+ ions so A is the answer

Ohhhhhh , righttttt , thanks man, good luck with your exams

 

[ahmadrr]

In q20 you have to look for the longest chain. And in this qs longest chain contains 5 carbons. Start numbering from the carbon closest to the functional group so ans is C

So its like a rule that we start measuring of carbon which is closest to the fuctional group. Thanks .

 

[ahmadrr]

for Q 10 B and D are wrong as there is no change in oxidation state,C cant be correct as an acid must have H+ ions so A is the answer

In question 10 I know the answer B,C,D are wrong but i cant seem to understand how is A answer. Hso3- doesnt look like it is acting as a base. Correct me if i am wrong.

 

[selrey]

So its like a rule that we start measuring of carbon which is closest to the fuctional group. Thanks .

If you look at the 2nd eq, HSO3- accepts H+ which is a property of base yk

 

[Thelastmoment]

Good for the exam tomorrow

 

[Metanoia]

Guys do we have to wash the conical flask before performing the next titration or nah?

If it is unused, there is no need to wash it.

If used, definitely wash it with distilled water. Unlike what some students think, there is no need to dry the flasks though.

 

[selrey]

How was chem prac guys? If anyone else had the prac today , that is..

 

[sarmadimran]

How was chem prac guys? If anyone else had the prac today , that is..

Went good expecting 31-32

 

[selrey]

Went good expecting 31-32

Woww nice I messed up a few parts but lets hope for the best

 

[anastasia grey113]

it went gr8
tho lost one mark in q2 last part
rest was all okay