Biology; Chemistry; Physics: Post your doubts here!

[Mehroz Ahmed]

Any One share Something about Chemistry ATP///!

 

[Mehroz Ahmed]

Re: Biology,Chemistry & Physics Help Available Here !

Wassalam!
Topic made sticky.

Non-Studies
Man Utd fan...!

 

[Suchal Riaz]

So I have started to do chemistry again...
I have been quite inactive in this thread for so long. ready to help and answer now! tag me if u need any help in physics and chemistry

 

[usama321]

the whole apparatus is a few centimeters above the paper, and when we draw the lines on the paper, it would be difficult to make them as we have to do that from above

 

[fatima0000]

what are the environmental and cost implications of underground power transmission compared to
overhead lines.

 

[Suchal Riaz]

what are the environmental and cost implications of underground power transmission compared to
overhead lines.

we will have to dig so we need to use machinery that will probably degrade the environment. machinery will use fuel so it will increase pollution.
in overhead lines, the cost of large poles will be high. birds and other animals can die due to overhead lines if they touch live and neutral wires at same time.

 

[usama321]

in overhead lines, the cost of large poles will be high. birds and other animals can die due to overhead lines if they touch live and neutral wires at same time.[/quote]
you could also add that the dirt dug causes air pollution. trees are cut off for digging in some places, resulting in erosion, and other problems associated to it. Coming to cost implications, underground cables prove to be more expensive due to all the digging. Also, there are maintenance problems, as underground maintenance is not that easy. But underground wires are protected from natural hazards.

Overhead lines look extremely unattractive. Also, there is more chance of electrocution in some form as Sachal stated . can't think of much else for it

 

[Suchal Riaz]

Please visit this thread: https://www.xtremepapers.com/commun...ms-tips-sciences-english-and-maths-only.25130

 

[chocolate_girl]

http://papers.xtremepapers.com/CIE/...al O Level/Chemistry (5070)/5070_w05_qp_4.pdf
Plz somebody open this link of a chem atp n go to question 9 part a n tell me how do v calculate temp rise in it.

 

[asma tareen]

they have given u the initial temp 25 c just subtract it

 

[papajohn]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_w05_qp_4.pdf
Plz somebody open this link of a chem atp n go to question 9 part a n tell me how do v calculate temp rise in it.

Subtract the room temperature that is 25.

 

[chocolate_girl]

And

they have given u the initial temp 25 c just subtract it

also in the same question, they say to plot graph n join points by 2 straight lines so can we skip a point in between for that??

 

[asma tareen]

And
also in the same question, they say to plot graph n join points by 2 straight lines so can we skip a point in between for that??

if a point is not coming in the straight line thn u can

 

[chocolate_girl]

if a point is not coming in the straight line thn u can

Last thing, i cant gt my c-ii) relevant with mark scheme. It would obviously b 0.8g mass as thats wen there is no more temp change but in ms they say it would be 0.65g!

 

[asma tareen]

hmm check again have u made two straight lines???

 

[asma tareen]

the point of intersection is 0.65 for both the lines so ms is correct

 

[usama321]

the point of intersection is 0.65 for both the lines so ms is correct

did you check it by making on paper?

 

[asma tareen]

did you check it by making on paper?

i have done this paper earlier

 

[chocolate_girl]

the point of intersection is 0.65 for both the lines so ms is correct

My lines donot exactly cross. I made 1 line from 2.8-8.3 n next from 8.3-9(these are values of temp rise)

 

[asma tareen]

My lines donot exactly cross. I made 1 line from 2.8-8.3 n next from 8.3-9(these are values of temp rise)

can u post ur graph i dont think u've drawn it correctly i would have posted mine but i dont know how to