CSSA Chemistry (1 Viewer)

[chels777]

i hope it is on the haber process or on ethanol i know them well

 

[Dylanamali]

Know your pracs well, each one of them if you.

Know how to do your calculations e.g. dilution, titrations, weight by weight percentages, etc.

Be familiar with your radioisotopes both in medicine and industry

Haber process

Basic acidic environment stuff e.g. pH calc, ionisation, conjugates, acidic/basic/neutral salts etc

Know your battery/cell

Know coordinate covalent bonds, ozone stuff, also how to test water samples

 

[mangoz]

Know your pracs well, each one of them if you.

Know how to do your calculations e.g. dilution, titrations, weight by weight percentages, etc.

Be familiar with your radioisotopes both in medicine and industry

Haber process

Basic acidic environment stuff e.g. pH calc, ionisation, conjugates, acidic/basic/neutral salts etc

Know your battery/cell

Know coordinate covalent bonds, ozone stuff, also how to test water samples

+1
Come on you lazy people, learn the stuff. Obviously the guy's trolling, the CSSA papers are sat on specific days for every school. If you don't sit the paper on that day, you're obviously not doing a CSSA one.

 

[Dylanamali]

+1
Come on you lazy people, learn the stuff. Obviously the guy's trolling, the CSSA papers are sat on specific days for every school. If you don't sit the paper on that day, you're obviously not doing a CSSA one.

Mangoz i don't claim to know the paper, I'm sitting it tmorow like everyone else... but my teacher did provide us a sheet with dot points. I'm just listing a few general things, by no means just study these.. make sure you know the whole syllabus, I'm just providing any help that I can.

 

[mangoz]

Mangoz i don't claim to know the paper, I'm sitting it tmorow like everyone else... but my teacher did provide us a sheet with dot points. I'm just listing a few general things, by no means just study these.. make sure you know the whole syllabus, I'm just providing any help that I can.

I was talking about magnificent. I gave you a +1 <- which generally means i'm supporting you LOL

 

[Dylanamali]

ahh right, my bad =O , missed that haha, cheers.

 

[chels777]

if the conjugate base what the acid turns into after it donates?

 

[Dylanamali]

if the conjugate base what the acid turns into after it donates?

HCl + H2O -> Cl- + H3O+

HCl is the acid, Cl- is its conj base
Similarly, H2O in this eq. is the base, and the hydronium ion is its conjugate acid

So yes, your kind of right, but be careful with your wording.

 

[chels777]

ok i shall thanks

 

[adz1098]

R there biopolymers

 

[Dylanamali]

R there biopolymers

mm not sure.. but it is quite a common 3 marker, so just make sure you know the general basics..

E.g. polyhydroxybutonate (PHB) formed using the bacteria Alcaligenes Eutrophes - similar properties to that of polyethylene, used for disposable cups, disposable razers, disposable sutures/stitches in surgery ----> biodegradable and biocompatible. =)

 

[adz1098]

thnks,

 

[adz1098]

Chromate and dichromate ions form an equilibrium according to the following equation.
2CrO4 ^2−(aq) + 2H+(aq)< ------>Cr2O7^2−(aq) + H2O(l)
Which solution would increase the concentration of the chromate ion (CrO4
2−) when
added to the equilibrium mixture?
(A) Sodium nitrate
(B) Sodium chloride
(C) Sodium acetate
(D) Ammonium chloride

 

[umz93]

Chromate and dichromate ions form an equilibrium according to the following equation.
2CrO4 ^2−(aq) + 2H+(aq)< ------>Cr2O7^2−(aq) + H2O(l)
Which solution would increase the concentration of the chromate ion (CrO4
2−) when
added to the equilibrium mixture?
(A) Sodium nitrate
(B) Sodium chloride
(C) Sodium acetate
(D) Ammonium chloride

...................

 

[Dylanamali]

Chromate and dichromate ions form an equilibrium according to the following equation.
2CrO4 ^2−(aq) + 2H+(aq)< ------>Cr2O7^2−(aq) + H2O(l)
Which solution would increase the concentration of the chromate ion (CrO4
2−) when
added to the equilibrium mixture?
(A) Sodium nitrate
(B) Sodium chloride
(C) Sodium acetate
(D) Ammonium chloride

hmm that is a bit difficult...
firstly, all the answer options are salts..

My first train of thought is that the increase would be caused by a decrease in the H+ concentration. Thus a reaction between an OH- with the H+, decreasing the H+ concentration. So I'm looking for a basic salt which would produce OH- ions.

a) sodium nitrate is a neutral salt, made from NaOH and HNO3
b) sodium chloride is also neutral, made from NaOH and HCl
c) sodium acetate is basic, made from NaOH and CH3COOH
d) ammonium chloride is acidic, made from NH3 and HCl

Thus the answer is C - sodium acetate..

Is that correct?

 

[adz1098]

............

 

[adz1098]

1 se

 

[Dylanamali]

1 se

do you have the answer adz?

 

[adz1098]

the answer is C

 

[adz1098]

lol ur preey good, r u sitting ur test 2moz