Chemistry: Post your doubts here!

[RoOkaYya G]

Number 7

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w10_qp_11.pdf

put in order of descending na.
so its 3>1>2

 

[♣♠ Magnanimous ♣♠]

molarity * molar mass = mass of the KOH in the solution
since 30 is the KOH there
so the mass represents 30 %
so 0.3 ---> 56 * 6.9 = 386.4 g
so per percent its 386.4 / 0.3 = 1288 g (using ratio to compare)
so density = mass / volume = 1288 / 1000 = 1.28

This is not right?

 

[♣♠ Magnanimous ♣♠]

put in order of descending na.
so its 3>1>2

YOU ARE WRONG!
Read the ques carefully.

 

[Lucy Black]

hey guys can ull give me notes on chemistry ppr 1 and 3...
and yeah..has anyone has already given their ppr ???

 

[RoOkaYya G]

YOU ARE WRONG!
Read the ques carefully.

-_- abt wht u see literally i meant.

 

[RoOkaYya G]

View attachment 48725 This is not right?

i dont know
i worked it out as i knew it :S

 

[♣♠ Magnanimous ♣♠]

hey guys can ull give me notes on chemistry ppr 1 and 3...
and yeah..has anyone has already given their ppr ???

Notes on paper 1 means wat?

 

[♣♠ Magnanimous ♣♠]

i dont know
i worked it out as i knew it :S

But why can't we take whole solution as 100 gm as it will simply solve all that.

 

[♣♠ Magnanimous ♣♠]

-_- abt wht u see literally i meant.

What is the correct order of the bond angles shown in ascending order (smallest first)? :/

 

[♣♠ Magnanimous ♣♠]

View attachment 48725 This is not right?

RoOkaYya G is answer 7.7 something coz see it is asked KOH solution and the whole solution i took 100 gms so for density i should take mass as 100 and not 30
Am i right?

 

[RoOkaYya G]

What is the correct order of the bond angles shown in ascending order (smallest first)? :/

The double bond has higher electron density than a single bond..thus the double-bond -single bond repulsions are greater than the single bond -single bond, making the single bond -single bond angle smaller than either of the 2 double bond-single bond angles and thus smaller than 120 deg.
its C the answer
3>1>2

 

[RoOkaYya G]

RoOkaYya G is answer 7.7 something coz see it is asked KOH solution and the whole solution i took 100 gms so for density i should take mass as 100 and not 30
Am i right?

i got 1.3
30 is its percentage by mass of the solution -_-

 

[Lucy Black]

Notes on paper 1 means wat?

any particular thing i should read.....

 

[♣♠ Magnanimous ♣♠]

Well refer this site --->
chemguide.co.uk
you will get everything

any particular thing i should read.....

 

[♣♠ Magnanimous ♣♠]

i got 1.3
30 is its percentage by mass of the solution -_-

Than why not 2.3 than?

 

[Lucy Black]

Well refer this site --->
chemguide.co.uk
you will get everything

thnxxxxxx..
are u appearing this year???

 

[RoOkaYya G]

Than why not 2.3 than?

look at my calculations the answer i got is 1.3. thts all i knw.
how would i knw y not 2.3? :/ ask someone else. im nt good at chem

 

[♣♠ Magnanimous ♣♠]

thnxxxxxx..
are u appearing this year???

nope.

 

[♣♠ Magnanimous ♣♠]

look at my calculations the answer i got is 1.3. thts all i knw.
how would i knw y not 2.3? :/ ask someone else. im nt good at chem

do you know anyone else?

 

[RoOkaYya G]

do you know anyone else?

not really :S
ask abdul moeed rana he's givin A2