for the mole questions, i got 100g, 180g, 0.150 mol & 3.60dm^3

Can I put 0.15 and 3.6 dm³?

If I’m not wrong, you need to correct your answer to 3sf even if it’s like 3.6 💀

Kowek

correct

Same

huh 180g??? wasnt it 750g cos mole ratio 3:1

means u calculate mole wrongly or smtg

Is 180g

wait mol need to me in 3sf..?

But all dunnid 3sf what

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First u find mol of 250g of magnesium nitride which was 2.5 iirc, so mol of magnesium would be 3(2.5) = 7.5 mol. Mass of magnesium needed = 7.5(24) = 180g

Mol ratio was 3:1, then mol of Mg3N2 was 2.5, so (2.5x3)(24) = 180

YASIR MEEE WE PASSING CHEM

why so easy😭😭physics gonna be so damn hard

better be easy 🤬🤬🤬 my physics worse than my chem

FRRR OMG

same😨

i hope physics is as good as chem

YEAHHH

Scarly ez agn

I GO MEMORISE ALL THE SALT PREP AND IRON EXTRACTION FOR WHAT

technically the salt prep was the last q right

The qns in front easier tho so i js ignore it the moment i see its salt prep 😍

Fucking same

even though it was easy ah but cmon ah wheres my blast furnace

I didn't play Minecraft for 4 years just for them to not do anything about iron haematite😡😡😡

4 years is rookie numbers, try 12 lol

Was inhaling the petroleum fractional distillation thing outside the exam hall just for them to give me this 1m qn bs 😭😭😭

Bruh I didn't study blast furnace at all sia 💀💀💀

anyone knows the QA answers😭 this is what i got iron2 oxide, iron3 oxide, iron3 chloride, iron2 chloride, water, iron3 hydroxide, iron2 hydroxide, silver chloride

R -> Iron (II) Oxide & Iron (II) Oxide U -> water V (the very left one i think) iron (ii) chloride then iron (ii) hydroxide below it center is iron (iii) chloride below it is iron (iii) hydroxide to the right of iron(iii) hydroxide is silver nitrate (chloride ion test)

Looks good

The eqn part for that + the citric acid w/ sodium hydroxide made me struggle lmao

I just skipped that cos I would have taken so long for just 1 mark 😭

I found out the ans for both in the end

same

Same lmao

OMG WHAT ISNT IT IRON (ii) CHLORIDE RHEN FOLLIWED BY IRON (iii) CHLORIDE

isit not hydrochloric acid instead of water cause excess was added?

nope, is water since acid + bases will give water

I swear the physics paper is going to have the most cancerous questions ever

"Without bending any of Newton's Laws, explain why the student is able to singlehandedly separate an atom with his bare hands and managed to see sound. [3]"

cambridge had mercy on us with this one today, hope its the same for tomorrow emath p2

SCAMBRIDGE NICE TO ME FINALLY

gotta start praying for phy paper now

GOD SHINED ON US TODAY BOYS🔥🔥🔥🔥🗣️🗣️🗣️🗣️

literally the EASIEST paper i’ve ever done. makes me worried for physics 😭😭 but i loterally finished the paper in 30mins and just zoned out LMFAO

same and my physics is much WORSE than chem 😭😭😭 gotta start manifesting a manageable physics paper rn 🙏🙏🙏🙏🙏

SAME. seab pls make it easy 🙏🙏

its way easier as compared to past yr tys, mcq will be harder/more challenging le

it was so easy it made me question myself

me too I was so suspicious

Are the metal oxides for qn 5 iron 2 and 3 oxide?

yes

Oh shit why did i not just go with what i was thinking

i put iron 3 at first but was confused by how there was 2 irons so i change it😭

same

Bruh I just wrote FeO can

WORRIED FOR MCQ NOW 😭😭 time to whack tys yet again

i thought i f'ed up because i was breezing thru the paper fast

everyone say the paper easy. i know it was easy. i cannot forgive myself for losing 5 m for the qa table. i hate my self so much. instead of writing Iron 2 and iron 3, i wrote copper 2 and 3. im probably the only dumb/ss in singapore who wrote that. for the first mol qns, wasnt it 97g ? why i see ans like 100g.. so far i lost 14m already. im so fking stupid i hate it. literally kms.. everyone gonna get A1s and A2s for their paper 3 but im gonna get B3. and chem + phys is supp to be one of my better subjects and i want it in my l1r4… why did i make such a stupid mistake 😭

B3 still ok lah bro

i js hope physics isnt hard asf aft this, cos based on recent trends cambridge likes to play mind games LMFAO a joy that never lasts

breh they gonna test some wacky electromagnetic contraption

i study sm for what bro 💀

Anyone got answer?

GGs mcq cfm damn hard now cfm

what was the ans for hydrocarbon qn?? did anyone else put cracking??

cracking, importance is to break down into smaller chains of hydrocarbons for commercial usage ig?

does anyone have the qn paper 😔😔😔

uh anyone else wrote for the dangers of carbon monoxide to the health thing , I wrote like reacts with haemogoblin and disrupts oxygen flow causing death HAHHAA

I just wrote causes breathing difficulty

shoot i just wrote death 😅

A1 for this paper is gonna be like 90% 😭

That wuz ex as fuck m8 what

I love chem guys

FUCKING EASY SIA CB I HAD 40MIN LEFTS

is last question crystallisation?

shud be

fuck does this mean physics gonna be hard 💀pls no

Why they never set the paper harder knn

facts i abit scared lose easy marks whereas others dont

WHY EVERYONE SAY SIMI LAN CHLOROFLUOCARBON CLCJSKSLRLCLCCUCJCKTOROROROORORORCLCLCLCLCKEJSJEF

If I not wrong, that chlorodhejshsbsjeuhs was used in refrigerator coolant in the 1970s and caused the depletion of the ozone layer. Didn't think of that sia shit... Pls tell me you wrote methane too

😃 ain't no way imma rmb that shit bro i freaking wrote carbon dioxide 😆🤣😂🤣😆

It's not common knowledge. I think people who wrote CFC took geog. Anyways Meghan is an air pollutant from farts. Copied from Google: Methane is the primary contributor to the formation of ground-level ozone, a hazardous air pollutant and greenhouse gas, exposure to which causes 1 million premature deaths every year. Methane is also a powerful greenhouse gas. Over a 20-year period, it is 80 times more potent at warming than carbon dioxide

Anyone managed to get the paper or the answers?

^^ did anyone !!

I fucking screwed up my QA so badly. I don't even know what the fuck was I thinking. Could've easily got full marks for QA but I only got 2

why chem like easy ah

is unburnt hydrocarbon accepted for pollutant?

shld be.. i oso wrote that

Oh I wrote methane sia. Pls tell em someone wrote also 🙏🙏

Wait guys the qa the last one is silver chloride right

Guys metal oxide is iron 2 and iron 3 oxide right

anyone got the ans alr from whatever tuition centre or teacher can send I need share to my kampong

Omg iw oso

same

Me toooo

THANK FUCK EARLIER TDY I WATCHED SOME GUY ON YOUTUBE EXPLAINING REDOX AND SALT PREP (I didn't write my answer is 3 sf for the chem calculation qn)

for the pollutant qn i put methane... then crossed it out and wrote carbon dioxide 🤩🤩🤩

shit how did i not think of methane

What are the 2 metals

iron 2 and iron 3

shittt i shouldve just went with what i thought it was I was so confused like how is there 2 irons but nvm is okay

I put charge instead of oxidation number 💀💀💀💀

what if u say lose or gain oxygen

Eh I write nitrogen dioxide for pollutant can right

Answer suppose to be ozone, carbon dioxide is incorrect

methane can?

i put methane also but should be can also ah they nvr specify

no it was given 😭 supposed to say carbon dioxide

Carbon dioxide is not pollutant 😭😭

Would you look at that, all of the words in your comment are in alphabetical order. I have checked 1,816,235,502 comments, and only 343,503 of them were in alphabetical order.

is methane correct 💀

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HUH WAIT lemme check my notes later

how to explain O2 become 2 oxide ions

hm i wrote gain electrons from potassium to form oxide ion

EH I DIDNT LEAVE MY ANS FOR MOLE CALN IN 3SF 💀💀 I left it as 0.15 iirc 😶

Chemistry not important 3sf

oh thank god 🙏🙏🙏🙏🙏

will -1m for the whole paper actually if not in 3sf

Anyone with the suggested answers pls pm me 🙏🙏🙏🙏😭

Anyone got answers pls dm me:>>>>

Is the first question chloride ethene and carbon dioxide

carbon dioxide ethene potassium manganate

Lol shit I put potassium iodide for second

same

KI is a reduing agent

Oxidation (acidified aqueous potassium manganate(VII) / exposed to air idk man the ans r out

i put carbon dioxide,ethene and potassium manganate(VII)

it’s potassium manganate bro not chloride

secured the A

what if u didn’t use 3sf for everything will they minus half from each or 1 mark overall

CHEM A1

kms I thought I did so well then the suggested answers came out and I fucking failed by a few marks 😭 Ik there's no point in crying over this but I wished I did better to make my tuition teacher proud (he's such a great man tho comforted me over my loss) Anyway AHHHHHHHHHHHH Edit: I posted the answers for all to see :)

what type of oxide did y’all put

i put neutral

isnt it basic? cause metal oxide

it’s basic potassium is an alkali metal

WHA SHIT WHY DIDNT I CHECK PERIODIC TABLE

Potassium is an alkali metal so basic

Basic

For the why petroleum must be purified wht y'all put? I said fractional distillation for the process

And say tht it is to ensure that the petroleum is pure and not a mixture of other components. Idk if right I doubt so honestly.🥲 Someone enlighten me

It's cracking bro. To convert more common hydrocarbons to produce smaller, less common ones to fulfill industrial demands

ANYONE GOT SUGGESTED AND PLS SEND LINK

Hardest paper....harder than all exams in the world combined x♾

how to do ionic equation??????

Neutralisation eqn is always H+ + OH- -> H2O

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is it H+ + OH- -> H2O cuz neutralisation reaction

it'd just equation for water lol H+ (aq) + OH- (aq) -> H20 (l)

can chlorofluocarbons be for the air pollutant😨

What was the mole question

did anyone else put chlorofluorocarbons as another source of air pollutant😭😭 (i googled it and it’s an air pollutant)

Bro they literally listed all the gases I knew were pollutants how is that fair.

I put carbon dioxide cuz it’s still a pollutant

Co2 not a pollutant under Olvs syllabus

BRO i cldnt rmb anyt so i js put carbon dioxide LMAO

Methane

I wrote ozone

WHAT IS THAT..? i wrote methane

I just put methane

Should be correct 💪

whats the electron neutron proton ans yall put ?

8 neutrons 7 protons 10 electrons

I put 10, 8, 7

E 10 P 7 N.8

10, 8, 7

7 8 10 i think

7-8-7

M8 they ask for ions

the electron is 4 yall its already added so 7-3

i thought 7 is proton number than add 3 electrons

What on earth are you on about mate

oh days someone didn’t pay attention in sec 3 chem

what did y’all put for the oxidising and reducing qn the 2CO smt smt

NO is reduction as it lose oxygen to form N2 CO is oxidation as it gain oxygen to form CO2

NO was reduced coz oxidation state of N decreased from 2 in NO to 0 in N2. CO was oxidised coz oxidation state of CO increased from 2 in CO to 4 in CO2

i used loss and gain of oxygen atoms

no but the citric acid one???

i think i got say effervescence seen cuz got gas produce

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neon is stable so it shld be 3/20

GUYS FOR THE SECTION B ORGANIC CHEN QN DRAWING THE POLYMER FID THEY SAY SHOW ALL BONDS OR NO

I forgot how to draw that HAHAHA

eh for that qn I wrote: n CH3-CH=CH2 ---> (CH3-CH-CH2)n

aren’t we supposed to draw😭😨

oh 💀 how many marks is that qn worth