gd rucks for ppl taking practicals in the near future~

• fstein

  8 Oct 07, 19:10

  gd rucks~
• TrixCereals

  8 Oct 07, 19:11

  good rucks too.
• kct360

  9 Oct 07, 18:08

  ha. screwed up my physics practical...
• lpx88

  9 Oct 07, 18:17

  Originally posted by kct360:

  ha. screwed up my physics practical...

  yea..supposed 2 be curve...but drew straight line..but some tcher sayin both accepted..k la..1 mark gone for this and 1 mark gone for explanation of the very last question
• Darkness_hacker99

  9 Oct 07, 18:22

  good ruck too..
• lolhahalol

  9 Oct 07, 18:45

  i only had 7 pts for the graph. I think the one without any resistor is another set of value so u will have a total of eight.
  Anyone know how to do the determine pd across ac?
  I put 3V cause i felt it was parallel to the power supply.
• kct360

  9 Oct 07, 18:59

  first thing i screwed up. i measured the emergent ray wrongly.
  2nd, determination of c, critical angle. dont know how to do.
  third, graph of Vbc against R i joined to 0.
  4th. dont know how to do the last part on explanation.
• lpx88

  9 Oct 07, 19:00

  Originally posted by lolhahalol:

  i only had 7 pts for the graph. I think the one without any resistor is another set of value so u will have a total of eight.
  Anyone know how to do the determine pd across ac?
  I put 3V cause i felt it was parallel to the power supply.

  No 1 i heard of used the resistor W leh
  
  i got 2.5....i asked everyone also 2.sth..i think there's some leeway and amrgin for error la
  
  That experiment plan giveaway one..just repeat experiment with different values and plot sin i against sin r. Gradient is n. Critical angle is sin inverse (1/ gradient)
• mrcoconut

  9 Oct 07, 19:13

  physics was easy easy easy
  
  can get close to full marks.
  i hope
• fstein

  10 Oct 07, 21:44

  Originally posted by lpx88:

  yea..supposed 2 be curve...but drew straight line..but some tcher sayin both accepted..k la..1 mark gone for this and 1 mark gone for explanation of the very last question

  same mistake... i ish also draw line
  
  only got 6 pts also... i forgot the combi of all 3 resistors...
• fstein

  10 Oct 07, 21:52

  Originally posted by lolhahalol:

  i only had 7 pts for the graph. I think the one without any resistor is another set of value so u will have a total of eight.
  Anyone know how to do the determine pd across ac?
  I put 3V cause i felt it was parallel to the power supply.

  series....
  
  1.25 x 2.... = 2.50v..
• lpx88

  10 Oct 07, 22:02

  Originally posted by fstein:

  series....
  
  1.25 x 2.... = 2.50v..

  X2.Funny sia.At 1st i blut blur go connect wire to find the potential btw AC
  
  Whoa overshoot the 3V mark on the Voltmeter
• kingkungfu

  10 Oct 07, 23:23

  how to do chemistry extention questions.meaning the last past of the chem practicals.btw i take sub science(chem)
• fstein

  11 Oct 07, 14:51

  Originally posted by kingkungfu:

  how to do chemistry extention questions.meaning the last past of the chem practicals.btw i take sub science(chem)

  read up on all the past practicals you did... gas syringe exothermic all those
  
  today my titration reading 25.8 25.6 25.6
  
  lead (II)
  oxygen
  NO3^-
• lpx88

  11 Oct 07, 15:42

  Chem
  
  20.2cm^3
  
  Titration dam scary sia..at 1st i got 19.sth...then i realised the grey colour is actually not pure..has a magenta tinge...so i redo and got my readings in the 20's range...which is what most got..
  
  Lead
  Iron(I know it's wrong.When i heat solid R nothing jus seem to come out of it)
  NO3-
• lpx88

  11 Oct 07, 15:46

  Originally posted by fstein:

  today my titration reading 25.8 25.6 25.6
  
  

  Whoa y yr reading so much higher than mine
• the Bear

  11 Oct 07, 15:50

  a ruck
  
  
• fstein

  11 Oct 07, 17:58

  Originally posted by lpx88:

  Whoa y yr reading so much higher than mine

  i got a orangey colour
  
  did you add indicator
  
  it's supposed to be red - orangey - yellow
  
  orangey is the neutral point
  
  my molar conc of the hcl is 0.102 mol/dm^3
• kct360

  11 Oct 07, 17:58

  i screwed it up... heated the R for like 20minutes? and nothing happened. wth.
• fstein

  11 Oct 07, 17:59

  Originally posted by lpx88:

  Chem
  
  20.2cm^3
  
  Titration dam scary sia..at 1st i got 19.sth...then i realised the grey colour is actually not pure..has a magenta tinge...so i redo and got my readings in the 20's range...which is what most got..
  
  Lead
  Iron(I know it's wrong.When i heat solid R nothing jus seem to come out of it)
  NO3-

  yah nothing came out for me too.. but my friend got like a mini explosion when he did it
  
  heheheheh it was so obvious
• fstein

  11 Oct 07, 18:13

  Originally posted by kct360:

  i screwed it up... heated the R for like 20minutes? and nothing happened. wth.

  20mins is too long
  
  the gas all liberated within the first minute
• lpx88

  11 Oct 07, 18:15

  Originally posted by fstein:

  i got a orangey colour
  
  did you add indicator
  
  it's supposed to be red - orangey - yellow
  
  orangey is the neutral point
  
  my molar conc of the hcl is 0.102 mol/dm^3

  i use screened methyl orange
  
  tcher say ans shud be ard 19.7
• fstein

  11 Oct 07, 18:22

  Originally posted by lpx88:

  i use screened methyl orange
  
  tcher say ans shud be ard 19.7

  oo
  
  dunno all my friends got at least 25....
• lpx88

  11 Oct 07, 18:25

  Originally posted by fstein:

  oo
  
  dunno all my friends got at least 25....

  i think diff schs use diff chemicals bah..
• fstein

  11 Oct 07, 18:28

  all should be constant
  
  but my sch use methyl and yours is screened. meh.