Chemistry: Post your doubts here!

[MYLORD]

Best thing is that me and u are the only one waiting for our Exam P11

YEAH !!!

 

[♣♠ Magnanimous ♣♠]

YEAH !!!

All the best sister

 

[MYLORD]

All the best sister

Thnx brother

 

[ZaqZainab]

ZaqZainab do try please

i am really tired right now and i am in no condition of solving anyways i see most of the questions are sloved already by memebres
Q9 By calculation, it can be found out that two mole of the salt reacts with 1 mole of sulfite. The half equation for the oxidation of sulfur shows us that 2 electrons are lost in the process. This means that the metal in the salt must be reduced and two electrons must be gained. Since two moles of metal ions reacts , the oxidation number decreses from +3 to +2, so that two metal ions can gain a total of two electrons to balance it out.
Q26 Halogenalkane react with NaCN not HCN We use HCN (with trace NaCN) to step up carbonyls. We use NaCN or KCN to step up halogen alkanes.
Q37
1. (Correct) CaO + ND4Cl --> CaCl2 + D2O + ND3
2. (Correct) CH3CN + NaOD + D2O --> CaCOONa + ND3
3. (wrong) NaOD + NDH3Cl --> NaCl + D2O + NH3 or NaCl + DHO + NDH2

 

[♣♠ Magnanimous ♣♠]

Thnx brother

I hope you do the best

 

[♣♠ Magnanimous ♣♠]

i am really tired right now and i am in no condition of solving anyways i see most of the questions are sloved already by memebres
Q9 By calculation, it can be found out that two mole of the salt reacts with 1 mole of sulfite. The half equation for the oxidation of sulfur shows us that 2 electrons are lost in the process. This means that the metal in the salt must be reduced and two electrons must be gained. Since two moles of metal ions reacts , the oxidation number decreses from +3 to +2, so that two metal ions can gain a total of two electrons to balance it out.
Q26 Halogenalkane react with NaCN not HCN We use HCN (with trace NaCN) to step up carbonyls. We use NaCN or KCN to step up halogen alkanes.
Q37
1. (Correct) CaO + ND4Cl --> CaCl2 + D2O + ND3
2. (Correct) CH3CN + NaOD + D2O --> CaCOONa + ND3
3. (wrong) NaOD + NDH3Cl --> NaCl + D2O + NH3 or NaCl + DHO + NDH2

MYLORD and GCE As and a level

 

[ZaqZainab]

yeah! i need a break of 2 days! and yes i will start a2 course

i have a break of 2 months and i am going to enjoy to the best why don't you guys have one

 

[♣♠ Magnanimous ♣♠]

i have a break of 2 months and i am going to enjoy to the best why don't you guys have one

2 MONTHS

 

[GCE As and a level]

2 MONTHS

|I have 3 months

 

[♣♠ Magnanimous ♣♠]

|I have 3 months

3 MONTHS not fair enough i just want 2 DAYS but the answer is No

 

[ZaqZainab]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w07_qp_1.pdf
Q9 , Q26 . Q37
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s12_qp_11.pdf
Q21 , 23 , 32
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s12_qp_12.pdf
Q20 , Q25
http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s07_qp_1.pdf
Q25,26,38
PLZ GUYS

Q21 The functional groups that react with Na are CO2H and OH, so three of any of these should be present in the compound. B and D are ruled out. NaOH will react with CO2H, so there should be 1 CO2H and 2 OH groups.
Q23

As the compounds reacts with itself to form the compound shown it must have both -OH and -COOH groups.
if we break up the compound we get one single product.
View attachment 45136

 

[MYLORD]

the one which..sacrifice4Revenge.. mentioned with 42.5 % thingy ???

 

[MYLORD]

MYLORD and GCE As and a level

thnx for the tag

 

[ZaqZainab]

3 MONTHS not fair enough i just want 2 DAYS but the answer is No

You are studying A levels right why so many months to study we start in September

 

[GCE As and a level]

M

You are studying A levels right why so many months to study we start in September

me 2

 

[♣♠ Magnanimous ♣♠]

You are studying A levels right why so many months to study we start in September

well i will start A level day after tomorrow but you know what! i will not go to school *evil laugh*

 

[GCE As and a level]

ZaqZainab Ur one of the great members here
THNX

 

[ZaqZainab]

I need to go now my brain hurts need to get some sleep last night i was watching arrow
Sorry guys i hope i could help but my brain forbids me too

 

[ZaqZainab]

ZaqZainab Ur one of the great members here
THNX

Thanks you and you are one of them too
Just remember me and my fellow member in your prayer that would be more than great

 

[GCE As and a level]

the one which..sacrifice4Revenge.. mentioned with 42.5 % thingy ???

I will search for it