How was Chemistry Paper 61 May June 2015

[Mr.Physics]

tbh I'm a bit nervous about chems and phy's paper 1 and 3

Physics is easy as shit though chem is really tough !!

 

[Kiara P.]

Guys what was your answer for the titration error thingy and improvement ??
I don't know but I had wrote that the error was perhaps the spillage of acid while pouring it into the burette .
And the improvement of this is to be more careful when pouring it up...
Lol..

 

[Mr.Physics]

Guys what was your answer for the titration error thingy and improvement ??
I don't know but I had wrote that the error was perhaps the spillage of acid while pouring it into the burette .
And the improvement of this is to be more careful when pouring it up...
Lol..

I wrote that NaOH wasn't measured accurately using measuring cylinder , so use pipette or burette to reduce the error

 

[NOneed2speedd]

Same

I wrote that NaOH wasn't measured accurately using measuring cylinder , so use pipette or burette to reduce the error

Here

 

[Mr.Physics]

Same

Here

What did you write in the last question ??

 

[NOneed2speedd]

What did you write in the last question ??

Oh that was easy
In firsr part i wrote (in brief) that note the volume and time taken for h2o2 to decompose then again repeat the experiment with manganese oxide and note the time and volume. . It would be noticed that rate is faster and more vol. Of o2 produced

And in second part i wrote about mass of manganese oxide before and after reac.

 

[Mr.Physics]

Oh that was easy
In firsr part i wrote (in brief) that note the volume and time taken for h2o2 to decompose then again repeat the experiment with manganese oxide and note the time and volume. . It would be noticed that rate is faster and more vol. Of o2 produced

And in second part i wrote about mass of manganese oxide before and after reac.

NO NOT MANGANESE OXIDE IT WAS COPPER II OXIDE LOL

 

[Mr.Physics]

Oh that was easy
In firsr part i wrote (in brief) that note the volume and time taken for h2o2 to decompose then again repeat the experiment with manganese oxide and note the time and volume. . It would be noticed that rate is faster and more vol. Of o2 produced

And in second part i wrote about mass of manganese oxide before and after reac.

And btw even if rate is faster it doesn't produce larger volume of O2

 

[NOneed2speedd]

And btw even if rate is faster it doesn't produce larger volume of O2

Yeah what ever was the catalyst and regarding volume i m not sure

 

[FAHAD imtiaz]

I had never expected that they will ask a litmus test for bromine !!

No there is no effect of it on litmus paper u guys can google it -_-

 

[FAHAD imtiaz]

What was the answer of difference in temp!

 

[FAHAD imtiaz]

I wrote that NaOH wasn't measured accurately using measuring cylinder , so use pipette or burette to reduce the error

Me too

 

[NOneed2speedd]

What was the answer of difference in temp!

Mine was 38

 

[Kiara P.]

And btw even if rate is faster it doesn't produce larger volume of O2

Yeah what ever was the catalyst and regarding volume i m not sure

" A catalyst is nor REACTED nor CHANGED in a chemical reaction "

It just lowers the activation hill that's all what it does. Making the reaction happen at a faster rate.
It does not contribute within the chemical reaction regardless of whatever it was..

 

[NOneed2speedd]

" A catalyst is nor REACTED nor CHANGED in a chemical reaction "

It just lowers the activation hill that's all what it does. Making the reaction happen at a faster rate.
It does not contribute within the chemical reaction regardless of whatever it was..

yeah i Wrote wrong about volume. . Hope they won't cut more than 1 mark

 

[Kiara P.]

yeah i Wrote wrong about volume. . Hope they won't cut more than 1 mark

No worries dude!
You basically had just mistaken in the volume thingy. Thus only one mark would be deduced.
You're on the safe side!!

 

[FAHAD imtiaz]

What about that in which they asked why there is difference in temprature though both acids have same concentration?

 

[Kiara P.]

Btw what was the answer of the very first question. The one with the condenser and stuff, there was a label pointing on a kind of flask asking for it's name.
I mean I wrote a boiling flask... is this wrong or wut ?

 

[FAHAD imtiaz]

The correct ans was it bleaches litmus paper slowly but no effect is acceptable!

 

[FAHAD imtiaz]

I wrote flask and I labelled water in and out !

Btw what was the answer of the very first question. The one with the condenser and stuff, there was a label pointing on a kind of flask asking for it's name.
I mean I wrote a boiling flask... is this wrong or wut ?