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Mathematics: Post your doubts here!
http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9709%20-%20Mathematics/9709_s11_qp_51.pdf Question 2part ii) need help.. please with drawing if possible!! -
Chemistry: Post your doubts here!
http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9701%20-%20Chemistry/9701_s10_qp_41.pdf Can anyone please explain how u draw the structures of phosphorus in Q1 part iii) -
A2 Physics | Post your doubts here
Must be like a slight difference right??? -
A2 Physics | Post your doubts here
isnt the gradient max at x=5 cos the line's more steeper!!? Sorry im kinda confused! -
A2 Physics | Post your doubts here
http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_s08_qp_4.pdf Can someone please explain the 4th c part.. Explanation given in the mark scheme seems to be kinda hard to understand! -
Chemistry: Post your doubts here!
http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9701%20-%20Chemistry/9701_w07_qp_4.pdf Can anyone pls help me with Q10d ii) Kinda dunno how theyve got the answer! -
Chemistry: Post your doubts here!
Down Group 2 the solubility of sulfates decreases..This is because with increasing cation size both hydration enthalpy and lattice enthalpy decreases.. But the decrease in hydration enthalpy is more than the decrease in lattice enthalpy..the breaking of the lattice therefore becomes tougher down... -
A level Biology: Post your doubts here!
The questionz asking u why co2 needs to be broken down into the ions rather being transported as co2... so itz because co2 is transported faster in this way coz there are enzymes involved and they increase rate of reaction.. about 85% of co2 is transported as hco3- ions in the plasma..this makes... -
A level Biology: Post your doubts here!
All cells fuse to form the hybridoma cell but in some cases only "certain" hybridoma cells are able to produce the required antibody.. remember the transformed cells in insulin production where they are checked for before being used in fermenters!!so itz something similar! -
Physics: Post your doubts here!
It's there on the first two pages of every pastpaper! -
A level Biology: Post your doubts here!
variations are of 2 types- phenotypic and genotypic. phenotypic variations are influenced by environmental factors whereas genotypic variations are not influenced by environmental factors. Variations can also be continous or discontinuous.For example gender of an organism is a discontinuous... -
A level Biology: Post your doubts here!
I guess i can help with the first one.. Variations are of two types-phenotypic and genotypic.. Genotypic variations are influenced by genes only whereas phenotypic variations are influenced by both environment and their genes. Simple examples include eating habits which are responsible for a... -
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A level Biology: Post your doubts here!
can anyone explain why the ans is D? -
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Physics: Post your doubts here!
how can u increase the amount of damping in a spring system??any examples.. -
A level Biology: Post your doubts here!
FROM SOURCE TO CELL C- consider the companion cell first,where there is active loading of sucrose taking place. H+ ions are pumped from the companion cells to mesophyll cells containing sucrose by active transport using ATP as an energy source. As a result the H+ conc builds up in the mesophyll... -
A level Biology: Post your doubts here!
TESTUBE A- results are negative coz the starch has been digested by the enyme at a pH of 6.5( in this case starch absent so iodine test is -ve) TESTUBE B- starch is not digested by the enzyme coz the pH is 2.00 which is acidic. starch is digested in alkaline conditions. hence starch is present... -
Notes
you can note down important points about each lesson.. the definitions and laws which are quite frequent in P4.. diagrammatic notes involving charts and all as they tend to stick better... BTW making ur own notes is better coz while writing them u tend to remember it once and while going thru... -
Physics: Post your doubts here!
In a piezo-electric transducer such as quartz two opposite sides of the crystals are coated with thin layers of silver to act as electrical contacts. when the crystal is unstressed, the centres of charge of positive and negative ions in any one unit coincide. the opposite sides of crystal act as...