Physics, Chemistry and Biology: Post your doubts here!

[skyangel]

Welcome but...?

i said that i did like that but the time finished and my question was left then lol, i cried

 

[loaie Amgad]

it's not a problem pen or pencil. .. ur answer should be correct

hahahahaha.....
Man your absolutely correct but do you think its easier to have concern or might lose a mark for an acknowlegdement....

 

[Saad the Paki]

Hey man .... I have a question
You once told me that we should use a pen for drawing diagrams of bonds in paper 3
But it states clearly on the very first page that we should use a pencil for diagrams
Now What hhhhhh????
Could you please turn out and tell me
Thanks in advance man......

Oh well.. now im confused too....
I never actually bothered to read the instructions
But they say u MAY not u MUST
Now i think pencil is better since they r instructing us to do so

 

[NOneed2speedd]

hahahahaha.....
Man your absolutely correct but do you think its easier to have concern or might lose a mark for an acknowlegdement....

better use pencil

 

[My Name]

i said that i did like that but the time finished and my question was left then lol, i cried

Its alright In Sha Allah it won't happen again.

 

[Shandana khan]

Physics 0625..Dear friends plzz help...in question no: 9 (c)

 

[loaie Amgad]

Oh well.. now im confused too....
I never actually bothered to read the instructions
But they say u MAY not u MUST
Now i think pencil is better since they r instructing us to do so

despite the fact that it was a silly topic but we at least came to know something .
Well thanks for your help bro....

 

[Abdurrahmanmuhammed]

Ummmm....
Im not too sure but it was one of the winter papers of 2011

2012 papers are hard ,summer and winter

 

[qwertypoiu]

Physics 0625..Dear friends plzz help...in question no: 9 (c)

Consider Y:
Since length is proportional to resistance,
Half length = half resistance (x1/2) <----- this means TIMES 1/2

And since area is inversely proportional to resistance,
One third cross sectional area = three times the resistance (x3)

Overall resistance compared to X = (x3/2)

Now since current flow is inversely proportional to resistance:
Amount of current flowing compared to X = (x2/3)

Therefore, current in Y over X = (2/3) over 1 = 2/3

 

[qwertypoiu]

Guyzz what is the direction of electron flow ?? +ve to -ve or -ve to +ve ?

Flow of electrons is from negative terminal of cell to positive terminal.
However, flow of conventional current is opposite.

 

[Muaaz Iqbal]

Any anybody explain me this question?

 

[ThePacifics]

Any anybody explain me this question?
View attachment 53796

8cm^3 of phosphate reacts completely with 12cm^3 of the T nitrate.

So we will take the ratio.
Phosphate:T
8:12

2:3

So i guess it will be like T3(PO4)2
As it takes 3 of the T ones to reach with 2 of the phosphates. I am not sure between.

 

[faizan123456789]

guys,can anyone explain me the cell in chemistry plzzzzzzzzzz

 

[Iris Dylan Lane]

Any anybody explain me this question?
View attachment 53796

Not my answer:
If you look at the plot, the height of precipitate increases linearly until you've added 8ml of phosphate solution, then levels out. That means at 8ml phosphate, you've precipitated all of the metal. It takes 8ml to react completely with 12ml of the T solution, or 2:3. That's the ratio of volumes, and since the solutions are of equal concentrations, it's also the phosphate:T ratio in the compound. Hence the formula is T3(PO4)2. T has a 2+ charge.

 

[DANISH182]

guys tips for p3 chem i am very bad in it i hate p3

plz ur help would be really appreciated

 

[Mr.Physics]

guys tips for p3 chem i am very bad in it i hate p3

plz ur help would be really appreciated

Just do past papers and work hard on your weak areas .

 

[DANISH182]

Just do past papers and work hard on your weak areas .

ok but i dont know the limiting reactant i have spend many hours reading it but no use

 

[Sariya Khan]

ok but i dont know the limiting reactant i have spend many hours reading it but no use

The reactant(substance) in a reaction which is in a limited supple hence limiting the time of the reaction. For example, a plant has very low water.. When all the water will be used up by the plant,there will be no more..right? So photosynthesis will automatically stop.
So in this case WATER is a limiting reactant ..Hope this helps you

 

[DANISH182]

The reactant(substance) in a reaction which is in a limited supple hence limiting the time of the reaction. For example, a plant has very low water.. When all the water will be used up by the plant,there will be no more..right? So photosynthesis will automatically stop.
So in this case WATER is a limiting reactant ..Hope this helps you

but how to calculate it with moles

 

[Sariya Khan]

but how to calculate it with moles

Provide me with a question so that I can help you. as I gave my Chemistry exam last year!