CHEM AND BIO HELP AND TIPS HERE

[Hesham Mhd]

Hey, for the electrolysis questions, these question are repeated frequently > What observations woud yu see when the switch is closed?
And > Precautions to make the expirement safe?
Thanks in advance

[PeaceMaker]

What do you do with the prediction temperature questions and the difference?

Thanks!

[Vin]

here u go:D

u forgot to attach it right ?? =P happens ..

[WARRIOR]

dunno i wrote because "Starch" always follows "Iodine" .. =P .. i think to check whether all the iodine is reacted in the reaction .. because for this reaction Iodine ions are formed before .. it is not a direct reaction .. my sir told me .. we dont hav to learn the details .. trust me its very complicated .. (my sir also loves to show off his chemi )

i see thanks

[Deniz]

?n exothermic reactions, the temperature in the beaker should decrease, since it is giving out some heat, but in the mark scheme it says that temp increases. im really confused. can u pls help ?

[Vin]

Hey, for the electrolysis questions, these question are repeated frequently > What observations woud yu see when the switch is closed?
And > Precautions to make the expirement safe?
Thanks in advance

if a bulb is present .. bulb lights .. or state the decomposition of the electrolyte for eg ..
electrolysis of molten Leadbromide

at cathode
tiny silver beads  (Pb)

at anode
orange/brown gas (Br)

safer : wear gloves, lab glasses, lab coat
well ventilated room or fume cupboard
 

[Vin]

What do you do with the prediction temperature questions and the difference?

Thanks!

see of the volume of the solution doubled .. temp halved
volume of solution halved .. temp doubled

post any particular paper u'll understand better

[Vin]

?n exothermic reactions, the temperature in the beaker should decrease, since it is giving out some heat, but in the mark scheme it says that temp increases. im really confused. can u pls help ?

exothermic reactions "give out" heat .. remember exo- outside
endothermic reactios "use up" heat .. remember endo - inside

[Deniz]

exothermic reactions "give out" heat .. remember exo- outside
endothermic reactios "use up" heat .. remember endo - inside

as u said it gives out heat, so the temp in the beaker where the exhothermic rxn takes place should decrease right?

[guMnam]

u forgot to attach it right ?? =P happens ..

yes

[guMnam]

as u said it gives out heat, so the temp in the beaker where the exhothermic rxn takes place should decrease right?

the temp in the beaker will increase

[Deniz]

the temp in the beaker will increase

hmm. ok when I thought deeply, i realesed that it should increase. Thanks.

[Vin]

as u said it gives out heat, so the temp in the beaker where the exhothermic rxn takes place should decrease right?

whoa whoa clear ur concepts =S .. i'll try to think something practical for u .. try this .. pour some hot water in a drinking glass imagine the hot water is a result of an exothermic reaction .. what do u feel when u touch the glass ??

[NidZ- Hero]

hey can any1 help me wid hw 2 demonstrate the solvent extraction of chorophyll

[Deniz]

whoa whoa clear ur concepts =S .. i'll try to think something practical for u .. try this .. pour some hot water in a drinking glass imagine the hot water is a result of an exothermic reaction .. what do u feel when u touch the glass ??

of course it will be hot. yes it clear enough for now. thx in advice.