Chemistry paper 1 and 2

[Mobeen]

yeast isnt an enzyme.. it contains an enzyme named zymase. . . .
nd frm the last three years we hav been studying tht enzymes dont take part in the chemical reactions,, so it is corect.. nd in chemistry we havnt been taught abt any organic catalyst so we shud stick to r sylabus nd not answer acording to higher level..
the ppr was so easy nd even then we are fighting over our ansers .. :S

 

[hamid_ishfaq]

yeast isnt an enzyme.. it contains an enzyme named zymase. . . .
nd frm the last three years we hav been studying tht enzymes dont take part in the chemical reactions,, so it is corect.. nd in chemistry we havnt been taught abt any organic catalyst so we shud stick to r sylabus nd not answer acording to higher level..
the ppr was so easy nd even then we are fighting over our ansers .. :S

i agree with you man and i confirmed this from the CIE!!!

 

[Mobeen]

thts great .. atleast its authentic..

 

[sunshine]

hamid_ishfaq you are totally dumb and idiot .!

hope you have a brain.!

 

[OakMoon!]

people.... enzymes are organic catalysts and this is in chemistry o level books... and sadly the A option was correct.. though i too chose B..

 

[allthatglitters16]

catalysts do not take part in reactions. they may be inorganic or organic. but i think that the option about catalysts not taking part in reaction is correct because this is how it has been defined in mark schemes, examiner reports, past papers, syllabuses and even books.

 

[allthatglitters16]

yeast is a microorganism, not an organic catalyst
if u r refering to that fermentation reaction or the one about bread rising (bio 5090 syll) then yeast respires anaerobically producing carbon dioxide and ethnol. and so yeast does not speed up the reaction but only carries out its own processes.

 

[OakMoon!]

o bhai... if u study then u knw about enzymes.... AMYLASES, LIPASES, PROTEASES r enzymes that are made of proteins and r inorganic...catalyst remains unchanged at the end.. but this doesnt mean it didnt take part in the reaction... wen u knw about the detail of a catalytic reaction then u ll understand

 

[Areesha Bukhari]

my paper dint go too well...... any guesses abt percentile this year??? did many people get their answers right ??? i am tensed.

 

[Mobeen]

there is no point arguing on tht 1 mark question. . tell me wht was the answer to the sodium question .. in P1 .. we were given melting point , density nd conductivity ..

 

[hamid_ishfaq]

hamid_ishfaq you are totally dumb and idiot .!

hope you have a brain.!

and what makes you say that SUNSHINE!!!

 

[hamid_ishfaq]

i told you guys that organic catalysts do exist but at our stage atleast in chemistry we havent studied organic catalysts and so the answer is (b) and i have a link to site which tells that catalysts dont take part in a reaction

heres the links

http://www.cartage.org.lb/en/themes/sci ... alysts.htm

 

[h_jay]

catalysts donot take part in the reaction but give a low energy reaction pathway thus lowering the activation energy but they donot take part in the reaction as they remain chemically and physically unchanged which is not possible if the did. And enzymes are organic catalysts but we DONT need to mention that as it is definitly NOT in ou syllabus!
ANd about that mcq shldnt the molecular mass be same?

 

[Mobeen]

ANd about that mcq shldnt the molecular mass be same?

if u r talkin abt the mcq in which hydrogen amount was same i think .. the answer was empircal formula..

 

[hamid_ishfaq]

ANd about that mcq shldnt the molecular mass be same?

if u r talkin abt the mcq in which hydrogen amount was same i think .. the answer was empircal formula..

i also agree with mobeen that it is emperical formula because molecular mass depends upon the the other products aswell!!!! while emperical formula is the reacting ratio!!!

 

[Mobeen]

yes .. this question has cum many times in past pprs .. nd mark schemes also say the answer is empirical formula..

 

[Syed Ali]

who says that organic catalysts are not present in our syllabus. It is clearly written "define enzymes as BIOLOGICAL catalysts...... " . Thought I too marked it B.

 

[Syed Ali]

i told you guys that organic catalysts do exist but at our stage atleast in chemistry we havent studied organic catalysts and so the answer is (b) and i have a link to site which tells that catalysts dont take part in a reaction

heres the links

http://www.cartage.org.lb/en/themes/sci ... alysts.htm

LOLs. in the second line it is written "Enzymes function as organic catalysts. A catalyst is a chemical involved in, but not changed by, a chemical reaction. "

INVOLVED signifies that they DO take part in reactions!!!!

 

[Mobeen]

ghoom phir ke baat wahin catalyst pe aa jati hai .. LOL !!

 

[OakMoon!]

ans was A... ab bas bhi kardo... MS aye gi tou dekh lena.... agay ke papers ki khair manao...