Idkwhattoput
Member
- Joined
- Mar 14, 2018
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- HSC
- 2019
- Uni Grad
- 2024
Yeah. Surprising it hasn't been leaked early yetHey guys, does anyone seem to have the Chem paper? I can't find it anywhere!
Yeah. Surprising it hasn't been leaked early yetHey guys, does anyone seem to have the Chem paper? I can't find it anywhere!
Reagents and reactants are mostly used interchangeably, however, reactants more specifically are used up in the reactionBut identifying the reagents didny mean the
I thought identifying reagents was what was needed for the reaction to occur?? Is that not right?
You or someone else previously mentioned that they 'forgot' to talk about how esterification produces water when it was mentioned that reagents need to be stated. So, do we actually need to state what was produced as a byproduct?Reagents and reactants are mostly used interchangeably, however, reactants more specifically are used up in the reaction
That wasn’t me, I almost forgot. But yeah, I’d assume you’d have to mention by products since it asks to describe the processYou or someone else previously mentioned that they 'forgot' to talk about how esterification produces water when it was mentioned that reagents need to be stated. So, do we actually need to state what was produced as a byproduct?
Fair enough. I thought they were implying you're supposed to because it says to mention the reagents.That wasn’t me, I almost forgot. But yeah, I’d assume you’d have to mention by products since it asks to describe the process
Well reagents mean reactants, the by products are useless so they aren’t really used in the next step as reactantsFair enough. I thought they were implying you're supposed to because it says to mention the reagents.
i don't have answers so i can't check for strong acids and bases basically it was one of the last four right? i was desperate so when i was up, signed and walking out (please don't begrudge me lmao i was literally leaving) i just chucked a glance at the smart girl's sheet before me - only had time to look at the last four questions - and i mean all were same but last so fingers crossed. i got a lot of Ds lmao idkI lost like 3 marks in MC - the strong acid strong base, radioactive one and q20...
Though I did well in short answer so yeah... Honestly found MC to be the hardest part of the test
the strong acid/base one was q18, think i got A...? not sure though, literally can't remember the equationi don't have answers so i can't check for strong acids and bases basically it was one of the last four right?
sorry haha i was the reactant/reagent person. was probably a little cooked last night - i think it's allg, u only needed to talk about reactants. and yes, that is correct - it was in my notes so i'm assuming i got it from either tutoring or one of my textbooks. you need the acid bc otherwise substitution w water is too slow.I'm as surprised as you. I always thought reagents was synonymous with reactants. Also, for that last question (chloroethane to ethanol), is water and sulfuric acid catalyst correct?? I wrote that but I assumed it was wrong because I can't seem to find them anywhere???
I got D strongest acid HF and strongest base CH3COO-the strong acid/base one was q18, think i got A...? not sure though, literally can't remember the equation
The strongest acid was CF3COOH, and the strongest base was F-.I got D strongest acid HF and strongest base CH3COO-
it's okay, now when i think about it i answered part 1 of that AAS question really badly. all i said was they form precipitates, i didn't even talk about how one metal has a higher ksp than the other etc. etc.
yep, i'll defs need to stop thinking now. it's just that i don't have any exams left so i kinda have nothing to do but think about it HAHA this is harder than i thought it would b
omg wait i think it's because i mistook CF3COOH for acetic acid? OMG AKSKSKS THAT'S SO SAD I'M SO BLIND WTFThe strongest acid was CF3COOH, and the strongest base was F-.
Tbf i only knew that because after a 10h binge of Breaking Bad i decided to look up about hydroflouric acid, and saw that it was weak but corrosive,
IIRC i looked it up after the exam and CF3COOH has a pKa of like -0.25, so it is very strong, hence its conjugate base is weak.
wait so do we need to write what the compounds were because i didn't do that i just assumed that reagents meant what was needed for the reaction like sulfuric acid, heat, etc. but for cholorethane to ethanol, you needed NaOH and heat im pretty sure? some say reflux not heat thoI'm as surprised as you. I always thought reagents was synonymous with reactants. Also, for that last question (chloroethane to ethanol), is water and sulfuric acid catalyst correct?? I wrote that but I assumed it was wrong because I can't seem to find them anywhere???
huh what? is this question 18? where's the acetic acid coming from lolcan someone please explain why it was possible for the equilibrium constant to be 3 if the other acid was stronger? it lied to the right, i.e. concentration of products greater, and i thought that meant HF ionised to a greater degree than the other way around, because the other acid was on the right and if it were relatively stronger i don't understand why there wouldn't be a lot more CF3COO- or whatever in the solution so the equilibrium constant would've indicated a reaction lying to the left
not to mention if HF were a weaker acid, more of it would be in its molecular form and that would mean even more molecules on the left
EDIT: aksksksk yeah it's acetic acid CH3COOH hence i was right SORRY FR GETTING UP IN ARMS
do you remember which option this was? sounds like A - but i'm not 100% certain.The strongest acid was CF3COOH, and the strongest base was F-.
I forgot, but my friend put down A and had the same answer. So i would say its A.do you remember which option this was? sounds like A - but i'm not 100% certain.
I think we just need the paper. I’m totally blind (I do remember a higher than 1 constant tho) and I asked two of my friends and they got the same thing, so I thought it was acetic. You guys know your stuff though and both of you got something else, so we could’ve just all misread the question at my school HAHAhuh what? is this question 18? where's the acetic acid coming from lol
also wasn't the equilibrium constant way smaller than 1? i also don't remember the reaction equation...smh, where is the paper?!
i think i got the same thing as dotwingz tho
edit: yeah, i just searched up their respective pka values, cf3cooh is stronger than hf
do you remember which option this was? sounds like A - but i'm not 100% certain.
oh nah i don't think it was acetic, the acids in the reaction were hf and cf3cooh. i just can't remember which one was ionising on the LHS or the value of Keq so can't figure out the full answer rn.I think we just need the paper. I’m totally blind (I do remember a higher than 1 constant tho) and I asked two of my friends and they got the same thing, so I thought it was acetic. You guys know your stuff though and both of you got something else, so we could’ve just all misread the question at my school HAHA
Me expecting my IPT from two years ago to count in HAHAoh nah it's defs not acetic, the acids in the reaction were hf and cf3cooh. i just can't remember which one was ionising on the LHS or the value of Keq so can't figure out the full answer rn.
i'm just procrastinating on phys hahaha (since it hasn't counted for me in my past atar estimates ;-; i'm still trying though!!!)
now ur seriously making me doubt my memory HAHA, can the paper pls be released ;-; nesa will probs release it next mon.Me expecting my IPT from two years ago to count in HAHA
This just means both me and all my friends misread OMG embarrassment! I concede defeat. I do remember the equation tho - equilibrium with HF on the right, other acid on left. Idk why I remember the constant was 3, maybe that’s just placebo too? I based my entire answer off it being bigger than 1, but at this point I’m going to consider it a warped memory.