Chemistry: Post your doubts here!

[SIstudy]

Na will react with both Na and COOH okay so
when it reacts with 1 OH it will give charge of -1 and then another OH it will become -2 and then with COOH it will be -3 as the question says
and NaOH will only react with COOH
so it will give -1 with one COOH thats it
but for A there are 3 OH groups and 1 COOH

oh okaayy silly me :/
Thank youuu soo much ^_^
may Allah bless yu

 

[omarjaved619]

3rd statement is a fact.
secondary alcohol ( alcohol where OH group is attatched to the carbon atom, which is bonded to 2 other carbon atom) is oxidized to ketone

I know that. But I just cant see it happening there in the equation given.

 

[omarjaved619]

Which substance, in 1 mol dm–3 aqueous solution, would have the same hydrogen ion
concentration as 1 moldm
3 of hydrochloric acid?
A ethanoic acid
B nitric acid
C sodium hydroxide
D sulphuric acid

Answer is B. But the question is....WHY?

 

[Snowysangel]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s13_qp_12.pdf 25 D

 

[zem]

Need help!

 

[Snowysangel]

Which substance, in 1 mol dm–3 aqueous solution, would have the same hydrogen ion
concentration as 1 moldm
3 of hydrochloric acid?
A ethanoic acid
B nitric acid
C sodium hydroxide
D sulphuric acid

Answer is B. But the question is....WHY?

Cause Hcl and nitric acid are both strong acids which dissociate completely in water to give one mole if hydrogen ions

 

[zem]

Anyone??

 

[Snowysangel]

Need help! View attachment 45096

Is it D?

 

[zem]

Is it D?

No Its C!

 

[Snowysangel]

Anyone?? View attachment 45097

Is it A?

 

[zem]

Is it A?

No B

 

[Snowysangel]

No Its C!

Oh it's cause they're in a 2:1 ratio. If one mole if sulfite loses 2 moles of electrons than 2 moles of the metal will gain two moles of electrons, meaning one mole if the metal will gain just one mole of electrons

 

[ZaqZainab]

Anyone?? View attachment 45097

it is clearly an alcohol and a tertiary one as it is mentioned DOES NOT
Try making a tertiary alcohol WITH chiral center
so the center carbon can not be bonded to 2 CH3
the central carbon is bonded to OH,CH3,CH2CH3 and CH2CH2CH3

 

[kingo44]

Na will react with both Na and COOH okay so
when it reacts with 1 OH it will give charge of -1 and then another OH it will become -2 and then with COOH it will be -3 as the question says
and NaOH will only react with COOH
so it will give -1 with one COOH thats it
but for A there are 3 OH groups and 1 COOH

ok but 2 na in naoh reacts with cooh in other questionj

 

[zem]

it is clearly an alcohol and a tertiary one as it is mentioned DOES NOT
Try making a tertiary alcohol WITH chiral center
so the center carbon can not be bonded to 2 CH3
the central carbon is bonded to OH,CH3,CH2CH3 and CH2CH2CH3

Oh i see thankyou

 

[Snowysangel]

No B

C makes the most sense though. Because it can't be oxidized by kmno4 it has to be a tertiary alcohol with 3 different carbon groups attached to the central carbon

 

[zem]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w09_qp_11.pdf questions 21 27 and 40

 

[Snowysangel]

it is clearly an alcohol and a tertiary one as it is mentioned DOES NOT
Try making a tertiary alcohol WITH chiral center
so the center carbon can not be bonded to 2 CH3
the central carbon is bonded to OH,CH3,CH2CH3 and CH2CH2CH3

But that makes a total of 7 carbons

 

[ashcull14]

t

is it C? 940+2(-110)= +720

hnks

 

[unique111]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s13_qp_13.pdf
Q.28 C
Q.29 D
Q.30 C