Science Practical Olvl

PwnYou SG

So what is the correct answer?

Mine was completely screwed up, i did the chem part twice but still couldnt get answer.. I wrote ammonium sulphate Embarassed

The bio part was difficult for me as well Crying or Very sad

Y_Shun SG

my curbe only touch 2 points!

aiya neh mind, got smooth curve can liaoz!

LordIcarus SG

i just remembered, i forgot to label my graph. LOL. Laughing

Y_Shun SG

graph of x/cm aganist angle of incidence/degree

x/cm(y-axis)
i/degree(x-axis)

Mervyn>_< SG

Been a while since I done this kind of experiment Very Happy

lpx88 SG

Izzit use pins and view through a glass block??

Coz pure phy has that as well

Got curve as well too wtf man

2 way to improve exp...uh..repeat whole exp and widen range? Laughing

Sienx SG

to be honest i think the bio part this year more on theory work lehs…~~

kenizaton SG

i wrote calcium sia..kns..and for physics..i only used 1 piece of paper to draw the ray..haiz..supposed to use 1 paper for 1 angle de..didnt read the qn properly..lots of ppl committed the same mistake as me too..zzzzz..

Sienx SG

wa.. Crying or Very sad

hoseh liao...u mean u nvr use the rest of the pieces to draw the other degrees ?

felirox SG

oh asyte. me too. i was rushing for time! oh man..deduct 1 mark right??

Darkness_hacker99 SG

Yar.. Then slowly in cooperate theory into the Practical for bio liao.

Darkness_hacker99 SG

My sister also forget to label her graph.. Laughing

felirox SG

the drawing of the glass block used up alot of my time! the graph 5 marks leh! alot leh.

Kohler~* SG

i wrote zinc chloride too,

but my teacher told me its zinc carbonate Crying or Very sad

Darkness_hacker99 SG

/pat pat..

Sienx SG

Heng i not chem...or i woudl hav died.... i from sec 1 till 4 cant understand what is chem like LOLS... btw the phyiscs...the 2 ways to improve what u guys wrote Rolling Eyes

TrixCereals SG

I didn't have time and wrote repeat the experiment and using more pins for better alignment of the ray. Laughing

Screwed-up.

abyone SG

I tested for carbonate... carbonate present... carbon dioxide gas present... effervescence shown

Then, I tested for Chlorine... ALSO Present?!?! White ppt formed

Lastly, Zinc present too...

Due to lack of time to think, I left my salt as Zinc Chloride
Haizz,,, i heard later on from my sci teacher, it was zinc carbonate...

So how many marks will I be deducted?!?! I left all present ... and salt as Zinc Chloride...

I suspect Chlorine was present in my test due to my improper cleaning of test tube ... T.T

S2pid Physics used up so much of my time...
I drew a best fitting line T.T coz 1 of my points went out of the curve shape...

Darkness_hacker99 SG

Did you test the gas with limewater? Did you write something like "lime water turns chalky; carbon dioxide is produced." kinda of things?

Effervescence itself can't tell whether is it CO2 anot.

Test for chlorine gas is use blue litmus paper. It'll bleach it.

Take 2 marks for each answer.

TrixCereals SG

The first part they asked you to heat the solid and actually told you to test the gas with limewater.

Another part is ask you add nitric acid den note down observations etc. I bubble through limewater but nth happen. But can see effervescence. I see the QA table if add nitric acid is test for carbonate den i just write Zinc Carbonate. Laughing

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