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A level Biology: Post your doubts here!
I'd like to know more about drawing plan diagrams.. -
Biology Practical notes!!
Yes I really would like to know more about drawing plan diagrams.. -
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A level Biology: Post your doubts here!
I can't find the O/N 15 papers anywhere anymore.. anyone can help me? -
Chemistry: Post your doubts here!
OH OHHH RIGHTTT. I just got one step wrong. Thanks mate! -
Chemistry: Post your doubts here!
Solid sulfur consists of molecules made up of eight atoms covalently bonded together. The bonding in sulfur dioxide is O=S=O. 2232 enthalpy change of combustion of S8, S8(s)= –2376kJ mol-1 energy required to break 1 mole S8(s) into gaseous atoms = kJ mol-1 O=O bond enthalpy = 496 kJ mol–1... -
Chemistry: Post your doubts here!
No it is an ester actually. -
Does anyone have pre-2003 past papers for AS Level Bio,Chem and Physics?
So I just wanted to know if anyone has them.. -
Chemistry: Post your doubts here!
It's C because it has an odd number of electrons- 15. -
Chemistry: Post your doubts here!
Right, right, ofc. I was thinking more on the lines of could form after another reaction. Now I see what was wrong, thanks! -
Chemistry: Post your doubts here!
Nvm, I got the answer, thanks anyways! :D -
Chemistry: Post your doubts here!
Which reagent would react with prop-2-en-1-ol to form a product that could exist as optical isomers? Why is it bromine and not PCl5? -
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Chemistry: Post your doubts here!
oh sorry. 3FeO(s) + 2Al(s) = 3Fe(s) + Al2O3(s) -
Chemistry: Post your doubts here!
What is the enthalpy change under standard conditions for the following reaction? The standard enthalpy changes of formation of iron(II) oxide, FeO(s), and aluminium oxide, Al2O3(s), are and –266kJmol–1 and -1676kJmol-1 respectively. What is the enthalpy change under standard conditions for... -
Physics, Chemistry, Biology --------> Hardest Questions Compiled #A Level Version
Chemistry and Biology? -
Chemistry: Post your doubts here!
I'll let you know next I see one.. -
Chemistry: Post your doubts here!
Which compound might X be? In its reaction with sodium, 1mol of a compound X gives 1mol of H2(g). A CH3CH2CH2CH2OH B (CH3)3COH C CH3CH2CH2CO2H D CH3CH(OH)CO2H Answer is D, but how?