Physics, Chemistry and Biology: Post your doubts here!

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My Name

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Mustafa_8492 said:
well its the last question in the atp paper
any important points ??
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All I can say is read the question properly..... and understand what they want
and.... practice practice... and more practice ,_,
Oh and btw....
sohaib ul haq said:
hi
i have my english speaking exam day after towmoro and i compleatly suck in it can any one give me some tips
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My Name said:
The topics arent gonna help.... in my opinion....since the exam is like a conversation.....it has to be natural.....its not like they give you a topic and you give a speech or something.
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My Name said:
Nah its fine :)
Umm...no...Have you given the exam?
Mostly the examiner does NOT just stick to THE/ONE topic....it is all natural no specific TOPIC.
The conversation can lead to almost anywhere......just like when we chat normally.
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It aint gonna be my fault if it doesnt go exactly as it was for me.
Best of Luck.
 
Muaaz Iqbal

Muaaz Iqbal

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Saad the Paki said:
Well most of these questions have similar answers :
(f) For the first 2.. u just have to read the value from the graph.. i suppose thats pretty simple
(g) For the chemical reaction: If temperature increases.. it'll always be exothermic.. and if temperature decreases then endothermic..other than that if a precipitate is formed they'll mention it in the question.. so its a precipitation reaction....and if its just acid base given and no reference to temperature.. than u can write neutralisation reaction
(h) always remember that volume is inversely proportional to concentration... so write now they have doubled the volume so the concentration will be halved... consequently the temperature change will be less/ halved.
(i) the answer to this will always be the initial temperature u recorded... the first reading from the table ...ALWAYS
these type of questions will have similar answers to the above.. except the numbers will be changed
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Thank's Bruh... :D
 
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can anyone help me out with salt analysis in chemistry (paper 6)
any resources or guidance would be helpful. THANKS. :)
 
Saad the Paki

Saad the Paki

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topper_sb7 said:
Yes.
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This should help
blog_3_solubilityrules.png
 
NOneed2speedd

NOneed2speedd

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salam every1
well i need help with this question of p6
first, is the second graph correct consedering part (e)
and second question is that in part (d) I wrote that all the acid was used up but answer was all zinc used up as acid was in excess so i want to know that how would we knw weather zinc is in excess or acid
 

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Saad the Paki

Saad the Paki

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NOneed2speedd said:
salam every1
well i need help with this question of p6
first, is the second graph correct consedering part (e)
and second question is that in part (d) I wrote that all the acid was used up but answer was all zinc used up as acid was in excess so i want to know that how would we knw weather zinc is in excess or acid
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Lol.. How will the acid get used up... since they are constantly adding more and more HCL until no more reaction happens and the SAME mass of zinc was being used so obviously the acid will be in excess and zinc will be reacted (used up) completely
No the graph u've drawn is incorrect...zinc granules have bigger surface area than powder...so i hope u know that if surface area increases reaction rate decreases thus the the graph will be less steep hence BELOW the original graph... since the same mass of zinc (which means same number of moles) is being used same volume of gas produced...
 
NOneed2speedd

NOneed2speedd

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Saad the Paki said:
Lol.. How will the acid get used up... since they are constantly adding more and more HCL until no more reaction happens and the SAME mass of zinc was being used so obviously the acid will be in excess and zinc will be reacted (used up) completely
No the graph u've drawn is incorrect...zinc granules have bigger surface area than powder...so i hope u know that if surface area increases reaction rate decreases thus the the graph will be less steep hence BELOW the original graph... since the same mass of zinc (which means same number of moles) is being used same volume of gas produced...
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Thank u very much for ur help...
 
NOneed2speedd

NOneed2speedd

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Saad the Paki said:
Lol.. How will the acid get used up... since they are constantly adding more and more HCL until no more reaction happens and the SAME mass of zinc was being used so obviously the acid will be in excess and zinc will be reacted (used up) completely
No the graph u've drawn is incorrect...zinc granules have bigger surface area than powder...so i hope u know that if surface area increases reaction rate decreases thus the the graph will be less steep hence BELOW the original graph... since the same mass of zinc (which means same number of moles) is being used same volume of gas produced...
Click to expand...
Btw as far as i knw when S.A increases, the rate of reaction increases? No?
 
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