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L

L-Girl

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сᴏᴏʟ сяуѕтᴀʟѕ said:
Assalam-o-alaikum wr wb...

can someone please tell me the answer to this question!
View attachment 12192
Jazakallah Khair...
Click to expand...
it's B
because electrolysis of molten sodium chloride will only produce sodium and chlorine.
but the electrolysis of aqueous sodium chloride will form chlorine at the anode, hydrogen at the cathode, and sodium hydroxide. this is due to the presence of H+ and OH- ions as wells as Na+ and Cl- :)
hope this answers your question
 
сᴏᴏʟ сяуѕтᴀʟѕ

сᴏᴏʟ сяуѕтᴀʟѕ

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L-Girl said:
it's B
because electrolysis of molten sodium chloride will only produce sodium and chlorine.
but the electrolysis of aqueous sodium chloride will form chlorine at the anode, hydrogen at the cathode, and sodium hydroxide. this is due to the presence of H+ and OH- ions as wells as Na+ and Cl- :)
hope this answers your question
Click to expand...
in aqueous solutions...the one lower in the series is discharged, in this case OH- ions...

the thing you are saying is when the solution is concentrated but in the question, no where it is mentioned that it is concentrated which means it is dilute :confused:
 
L

L-Girl

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сᴏᴏʟ сяуѕтᴀʟѕ said:
in aqueous solutions...the one lower in the series is discharged, in this case OH- ions...

the thing you are saying is when the solution is concentrated but in the question, no where it is mentioned that it is concentrated which means it is dilute :confused:
Click to expand...
no it doesn't have to be dilute
 
meriama

meriama

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guys can someone help me out with bio P12 - nov 2010 questions 29 and 40.
thanks :)
 
Razo513

Razo513

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meriama said:
guys can someone help me out with bio P12 - nov 2010 questions 29 and 40.
thanks :)
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29 --> A it's the steepest curve (steep means faster)
40--> A they said persistent pesticide DOESNT BREAK DOWN ( so answer cant be B) it cant be D cuz most pesticides dissolve in water .. it cant be A since it becomes less concentrated rising up the food chain
 
meriama

meriama

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i'm sorry but which paper is that?? :) coz i think it's different, but thanks for replying back :D
 
Tekno-M

Tekno-M

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сᴏᴏʟ сяуѕтᴀʟѕ said:
Assalam-o-alaikum wr wb...

can someone please tell me the answer to this question!
View attachment 12192
Jazakallah Khair...
Click to expand...

I think the question is missing some information, because for the aqueous sodium chloride, if it is concentrated, chlorine is produced at the anode, but if it's dilute, oxygen is produced. And sodium hydroxide is produce either way, concentrated or dilute. But molten sodium chloride only gives sodium and chlorine. Hope this helps :D
 
FATIMAH

FATIMAH

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PLZ ANYONE HERE CAN HELP ME !!!
HOW WILL WE KNOW THAT THE FIRST ONE WILL BE DISPERSE BY ANY MAMMAL AND THE SECOND ONE BY WIND ??? IS THERE ANY VISIBLE FEATURE ???

THANKS IN ADVANCE :)Capture.PNG
 
saroooor

saroooor

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FATIMAH said:
PLZ ANYONE HERE CAN HELP ME !!!
HOW WILL WE KNOW THAT THE FIRST ONE WILL BE DISPERSE BY ANY MAMMAL AND THE SECOND ONE BY WIND ??? IS THERE ANY VISIBLE FEATURE ???

THANKS IN ADVANCE :)View attachment 12212
Click to expand...
Fruit 1 seems spiny which would stick on the mammals fur , but fruit 2 seems wide spread Like Parachute seeds has many hairs which helps it to be carried some distance by the wind .
 
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