hey i thought i can say the ans now,
1)was u had to draw chramatography.
2)explain how u see the cholorophyl in the chramotogram and compare with known spots of chlorophyl, or check and compare Rf value.
3)- write about photosynthesis
- write what does it do (i.e help to trapl sunlight for enegy to combine carbondiaoxide and water)
- write the products of photosynthesis (i.e oxygen and glucose)
then comes tht stuff for elctrolysis.
where an OH is relesed write on the anode the sunstance oxygen (there will be 2 answers with oxygen on the change of anode in this question)
then there was hydrogen and i think copper for change in cathode.
and the last one was aqueous concentrated pottasium bromide.
then i think came the question of periodic table stuff which is easy... i dont think i have to discuss it.
then cam the question of unfamiliar and familiar metals, now this is the only part in the exam i had trouble with. the first 2 question of it i messed up i think (well maybe the frist only the most). the ans for barium was +2, and the answer for the last one i wroet "cuz the same metal is able to react with different substances due to presence of different oxidation states, and they are transitional metals.." questions of haber process came tht ok, the graph was going backwards (down and curved) then explain by refering to exothermic reaction in equilibrium...
then the rest was ok then came, the question how can u say this is exothermic, here u just do those calculations, they even gave u the table for the numbers u need to use. u get answer negative (-530) which means its exothermic reaction.
then came test of sturation, and how water acted as base which was really easy. then cam the question of what happens when lactic acid is heated, the ans: acrylamide acid and water.
then the last page with calculations, first u get the answere for empirical formula as Mg3N2 (i can explain to u how if u want to know).
then the ans for the balencing of the equation:
Al4C3 + 12H2O --->4Al(OH)3 +3CH4
then last question the ans is: silicon is the limiting factor as fulride had 2 times the number of moles of silicon reacted so flourine was in excess.
teh number of moles of silicon fluride was:0.08 moles
now the only question i truly messsed up in was tht phosphate stuff, i must choose a metal tht doesnt dissove, and i must choose a metal tht has higher reactivity than sodium so it could be displaced. there fore i had problems and just wrote T3PO4. but u should also know tht this is not the reson to write. as they gave u tht graph for a reason, so u need to write tht hight of precipitate wise. so if u wrote the reson tht goes somethin like this "i must choose a metal tht doesnt dissove, and i must choose a metal tht has higher reactivity than sodium so it could be displaced", then i feel u messed up...
well ths all correct me if im wrong, alas those were my answeres
lol and guys just write hydrogen chloride had a lower pH than hydrogen fluride. and how to test if those acrylamide stuff had acid, just add metal carbonat and if effevecence was shown due to libbiration of carbon dioxise (which turns lime water milky) then it contained acid group, they wanted an answer which has nothing got to do with an indicator.
