Some Chemistry TYS MCQ Questions

Garrick_3658 SG

can say both diamond and carbon are allotropes of carbon right?

Well if your first carbon is supposed to be graphite then yes.

Btw UltimaOnline do you wanna explain to us why GRAPHITE is the more stable allotrope of carbon when compared to DIAMOND? I know this fact just don't know the reason behind it.

SBS2601D SG

You're totally welcome, [e].Le-V!

(All you Sec 4 graduating folks, if you're going JC next year and would like 'A' level Chem tuition, you know where to contact me...

Pssst. It's really true that how you see and approach JC Chemistry, really makes a BIG difference whether you'll enjoy JC Chemistry or not. I help the students to see that Chemistry's really actually enjoyable, where JCs make it (falsely) seem a boring torture.)

Was a torture leh.....but not a boring torture.....kinda being more of the thousand-cuts execution type.....especially organic chem. Laughing

UltimaOnline SG

Well if your first carbon is supposed to be graphite then yes.

Btw UltimaOnline do you wanna explain to us why GRAPHITE is the more stable allotrope of carbon when compared to DIAMOND? I know this fact just don't know the reason behind it.

That's 'A' level stuff. You can google or wikipedia or answer.com about it if you're interested. But briefly, it depends on the temperature and pressure. At a certain temperature and pressure, graphite is more stable. An another temperature and pressure, diamond is more stable.

UltimaOnline SG

Was a torture leh.....but not a boring torture.....kinda being more of the thousand-cuts execution type.....especially organic chem. Laughing

Organic Chem is actually the most fun part of JC Chemistry, if you had attended my tuition, honestly. Coz I teach my students to UNDERSTAND while JCs force you to MEMORIZE BLINDLY. My students love mechanisms once I show them how mechanisms are soooo fun, and they now can draw all mechanisms without memorizing anything!

SBS2601D, now that you've graduated, wanna become an MOE teacher yourself? It may not pay as much, but at least it's more stable than the banking and finance industry. Choose your future carefully.

UltimaOnline SG

K, going out for dinner/supper liao. By the time I'm back, y'all koon liao. So make sure u guys have enough sleep, wake up refreshed for tmrw's exam paper, and makan enough breakfast so ur brain got glucose and can perform during the exam. Have fun!

wishboy SG

My doubt's on D. Why 1 mole? So we don't include the N in nitrate?

the question is
"All ammonium salts on heating with sodium hydroxide produce ammonia gas. From which ammonium salt can the greatest mass of ammonia be obtained?"

since it is asking for the mass of ammonia (NH3), we do not include the nitrate

SBS2601D SG

SBS2601D, now that you've graduated, wanna become an MOE teacher yourself? It may not pay as much, but at least it's more stable than the banking and finance industry. Choose your future carefully.

Wow.

How the heck you know where I'm headed to?

Honestly I never considered any of the subjects I took a bore. But chemistry certainly gave me one heck of a headache. Stuff like electrochemistry require me to put 110% effort in understanding before I could get anywhere.

And no. I don't memorise. As a result, I usually lose some marks here and there predominantly in those "define this and that" type of questions. Stuff people would say are "give-aways". Laughing

If you ask me, I would prefer studying physical chemistry. Now that's fun. Laughing

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