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A level Biology: Post your doubts here!
Do we have to learn all the geographical distributions for the various diseases (chapter 10) ? -
Physics: Post your doubts here!
Can anyone help me...In the b (iii) 2. part, shouldn't it be a negative sign between the two vertical components? The mark sheme says it's a positive one Solving it with + between them gives a different answer which is also mathematically correct but the answer in the ms comes only with a... -
March 2018 (Maths)
Can anyone who gave maths 9709 this March please recall and tell me about any difficult questions which came up in P1? It would be a really kind act...- A*****
- Thread
- cie a level march 2018 maths 9709
- Replies: 0
- Forum: Announcements
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Biology; Chemistry; Physics: Post your doubts here!
Same with me...learning bio seems difficult- A*****
- Post #20,421
- Forum: O-Levels / GCSEs / IGCSE
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HELPPP
Yes I know what she means...but I looked for them a few hours ago but most of them are available except for the recent years- A*****
- Post #6
- Forum: O-Levels / GCSEs / IGCSE
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HELPPP
They ARE available at https://www.gceguide.com/past-papers/- A*****
- Post #4
- Forum: O-Levels / GCSEs / IGCSE
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Chemistry MCQ thread...
When u take the moles for any product to be x in the first reaction, then y don't u take it as x in the next reaction, where it becomes the moles of the reactant? -
Chemistry MCQ thread...
Won't it be the reciprocal of 1.39 x 10^-2 i.e. 71.9? -
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We might be the masters of our own thoughts...Still we are the slaves of our own emotions..!
We might be the masters of our own thoughts...Still we are the slaves of our own emotions..!- A*****
- Profile post
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Distinctions List
Can someone plz tell me that when will the dinstinctions list come for May/June 2017 for Pakistan?- A*****
- Thread
- cambridge cie cie a level cie olevel
- Replies: 1
- Forum: Help, Ideas & Suggestions
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Chemistry: Post your doubts here!
If Cl joins with the lone pair so it will have 9 electrons in its outer shell(7 its own and 2 of X). Element X will have 5 electrons, so 3 chlorine atoms will join with it so that all of them have an octet configuration. -
Chemistry: Post your doubts here!
You must write Mn2+ instead of MnO4- in the working. Here it is not affecting the answer coz both have the same number of moles. -
A level Biology: Post your doubts here!
Just look at the y-axis... it is time taken for reaction, not the rate of reaction It is just the opposite...at the optimum temp. where the rate is highest, the time will be the least and similarly where the rate is least, the time will be maximum...note that the line will not cross 50°C bqz the... -
Chemistry: Post your doubts here!
Yes multiply by 10 aur by 250/25...both mean the same -
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A level Biology: Post your doubts here!
From the table, this is the lowest magnification...lowest magnification means that the size of each cell will be the smallest and so the maximum number can be seen The smaller the size of an object, the more of them can fit in an area of space -
Physics: Post your doubts here!
Suppose the diameter of the wider portion is 2r, so its radius will be r and area will be pi x r² Since the dia of the narrow portion is half, so it will be r and its radius will be r/2=0.5r and area will be pi x (0.5r)²= pi x 0.25r² Now the ratio of stress will be (T/pi x r²) / (T/ pi x 0.25...