POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

[Khaled Ayman]

Nov06 no.15 .

The answer is D why did you think it is A

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

yeschemistry , I thought the right answer is A cause i marked it wrong (A), Anyway , Why it increased by 5 ?

Nov 2006, Question 15 is this!

 

[GorgeousEyes]

Sorry Actually I saw it Nov2006 but I need Nov2008 no.15 the right answer is A , Why?

 

[Khaled Ayman]

yeschemistry , I thought the right answer is A cause i marked it wrong (A), Anyway , Why it increased by 5 ?

It shouldn't be increased it should be decreased as Endothermic reaction will take the energy from the surrounding and it should be 5 because half the volume of water is used

 

[Khaled Ayman]

Sorry Actually I saw it Nov2006 but I need Nov2008 no.15 the right answer is A , Why?

how is it A i'm sure it is B

 

[GorgeousEyes]

i don't know , In the mark scheme A . Ma I don't understand why ?

 

[GorgeousEyes]

It should be decrease of 20

 

[Khaled Ayman]

It should be decrease of 20

It is decreased because when decreasing the mass by half will cause the temperature to drop more as the reaction is endothermic at least that is what i understood from the examiner report

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

decreasing the volume of water will cause the temperature to drop more bcoz the solution is more concentrated!

 

[Khaled Ayman]

decreasing the volume of water will cause the temperature to drop more bcoz the solution is more concentrated!

Thank you

 

[GorgeousEyes]

Thanks Guys for your Help !

 

[FATIMAH]

PLZ HELP ME IN THIS QUESTION !!

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

PLZ HELP ME IN THIS QUESTION !!
View attachment 12285

Assalam-o-alaikum wr wb...
6 teeths in each jaws are molar...count 3 from each side...and you will know that there are 4 teeths which are filled!

 

[Khaled Ayman]

PLZ HELP ME IN THIS QUESTION !!
View attachment 12285

The one near the front of the mouth isn't a molar it is a pre-molar so it doesn't count. Molars are often bigger than pre-molars and with different shape so if you count it makes it 4

 

[FATIMAH]

Assalam-o-alaikum wr wb...
6 teeths in each jaws are molar...count 3 from each side...and you will know that there are 4 teeths which are filled!

thanks !!

 

[FATIMAH]

The one near the front of the mouth isn't a molar it is a pre-molar so it doesn't count. Molars are often bigger than pre-molars and with different shape so if you count it makes it 4

thanks !!

 

[Razo513]

Nov 2006, Question 15 is this!
View attachment 12284

the answer is D for a simple reason rxn is catalyzed by an enzyme so if we raise the temperature the enzyme will work faster thus increasing the rate if rxn
it cant be any of the others
because cooling will lower the enzyme action
adding water will make the solution more dilute less concentration thus low rxn rate
heating to a boiling point will denature the enzyme so the best answer is D

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

the answer is D for a simple reason rxn is catalyzed by an enzyme so if we raise the temperature the enzyme will work faster thus increasing the rate if rxn
it cant be any of the others
because cooling will lower the enzyme action
adding water will make the solution more dilute less concentration thus low rxn rate
heating to a boiling point will denature the enzyme so the best answer is D

Assalam-o-alaikum wr wb..
actually she confused the paper..i mean she told me to check 2006 instead of 2008 so i was telling her that Q15 in 2006 is that..iow it wasn't a doubt! thanx anyway

 

[Razo513]

Assalam-o-alaikum wr wb..
actually she confused the paper..i mean she told me to check 2006 instead of 2008 so i was telling her that Q15 in 2006 is that..iow it wasn't a doubt! thanx anyway

oh ok srry

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

oh ok srry

nah..it's okie!