CHEMISTRY PAPER 34 On 31st MAY

[fardeen721000]

someone can confirm no titration would be nice tbh other than h202 or starch

 

[darks]

Ok so no one wants to reply me regarding the error thing, i totally understand, its the last day but please confirm this.
2 d.p balance uncertainty = +-0.01 g
measuring cylinder = +- 0.5 cm3
burette = +-0.05 cm3
thermometer = +-0.5 *C
we multiply this by number of readings divided by our reading then x 100, to find % error. Correct? That's all i need to know regarding errors and uncertainties?

 

[Error Syntax]

Ok so no one wants to reply me regarding the error thing, i totally understand, its the last day but please confirm this.
2 d.p balance uncertainty = +-0.01 g
measuring cylinder = +- 0.5 cm3
burette = +-0.05 cm3
thermometer = +-0.5 *C
we multiply this by number of readings divided by our reading then x 100, to find % error. Correct? That's all i need to know regarding errors and uncertainties?

dude firstly they will give the the error with you most of the time , while sometimes you have to find it yourself which is the least count and if you have take two values such as a tritrate which requires the subtraction of inital and final volumes then you need to multiply the least count by 2.

 

[darks]

dude firstly they will give the the error with you most of the time , while sometimes you have to find it yourself which is the least count and if you have take two values such as a tritrate which requires the subtraction of inital and final volumes then you need to multiply the least count by 2.

Thanks Alot! Can you confirm if my uncertainties are correct.. I am confused about the 2d.p balance.. is it 0.01 or 0.005?

 

[Error Syntax]

Thanks Alot! Can you confirm if my uncertainties are correct.. I am confused about the 2d.p balance.. is it 0.01 or 0.005?

No its 0.01

 

[Thisansa]

No. You will get H2O2 rates of reaction using the starch indicator. Anywayz, I can confirm one practical that might come, but will I get banned if i TELL IT?

Please tell us

 

[fardeen721000]

Please tell us

he did mention similar types of questions below

 

[Dukula Jayasinghe]

Please tell us

I cannot. Its illegal. Only thing confirmed is H2O2. Al3+ and Mn2+ ions are not present 99% chance. NOT PRESENT

 

[Error Syntax]

I cannot. Its illegal. Only thing confirmed is H2O2. Al3+ and Mn2+ ions are not present 99% chance. NOT PRESENT

Just tell us this , Is tritration coming? or is the rate of reaction coming? or is it the enthalpy change coming?

 

[darks]

I cannot. Its illegal. Only thing confirmed is H2O2. Al3+ and Mn2+ ions are not present 99% chance. NOT PRESENT

Man HOW THE HELL DO YOU THINK IT'S ILLEGAL!? It is totally not! if you do not want to post here, please please Private message us.

 

[DeadbeatCIE]

HERE IS THE PREDICTION

1) Rates using H2O2 and Starch And KI
2) Enthalpy between Mg and acid
3) Qualitative analysis (Salts unknown/disputed)
maybe 3 cations and anions

 

[darks]

HERE IS THE PREDICTION

1) Rates using H2O2 and Starch And KI
2) Enthalpy between Mg and acid
3) Qualitative analysis (Salts unknown/disputed)

if those are the first 2 q's then salts must be sodium carbonate and copper sulfate. But... where will be sodium thiosulfate be used then?

 

[Error Syntax]

if those are the first 2 q's then salts must be sodium carbonate and copper sulfate. But... where will be sodium thiosulfate be used then?

I think its also going to be used for rate of reaction.

 

[DeadbeatCIE]

I think its also going to be used for rate of reaction.

That's right

 

[ErosKuikel]

So any last moment tips? Anything to declare?ANyone?

 

[darks]

so we are expecting this reaction to come

so, when timing, do we have to take multiple readings, then average. Or one reading only?

 

[fardeen721000]

I cannot. Its illegal. Only thing confirmed is H2O2. Al3+ and Mn2+ ions are not present 99% chance. NOT PRESENT

BE OUR SAVIOUR btw homie the papers arent leaked so these are all guesses hence its perfectly fine . and tell us all the ions not present that way youre not telling the answer xD

 

[Dukula Jayasinghe]

Ok guyz. According to Hassan's picture posted,
sir said 60% chance of rates , 40% chance of titration.
Tyoe iodometric with CuSo4 in google
Also small enthalpy might come if it is rate, but a bigger one might come if it is titration.
Qualitative Analysis Notes : Mn2+ or Al3+ wont be present it seems (not reliable)

 

[Hassan (SHT)]

BE OUR SAVIOUR btw homie the papers arent leaked so these are all guesses hence its perfectly fine . and tell us all the ions not present that way youre not telling the answer xD

haha, you nailed it

 

[fardeen721000]

Ok guyz. According to Hassan's picture posted,
sir said 60% chance of rates , 40% chance of titration.
Tyoe iodometric with CuSo4 in google
Also small enthalpy might come if it is rate, but a bigger one might come if it is titration.
Qualitative Analysis Notes : Mn2+ or Al3+ wont be present it seems (not reliable)

what about the one question you knew xD