Predictions for Chemistry 2014 HSC? (1 Viewer)

[enigma_1]

Any of you doing Shipwrecks and Corrosion as your options topic?

I cannot for the life of me put the equations for rusting to memory

OMGGG FINALLYYYY please help

It's shiprekkting me ((

 

[SuchSmallHands]

As someone who lost 15% on a titration prac worth a quarter of my overall mark for drawing equilibrium arrows on neutralisation reactions (wtf...) I can also attest to titration pracs/pracs in general being shit @enigma and @faisal

 

[QZP]

When chlorine is produced, to test it's presence you put litmus. Because chlorine is a bleaching agent, it will bleach the litmus. I.e, if you put red or blue litmus, the chlorine will make it go white.

where did you learn this (don't say sample answer pls). cus i cant find anything about that in textbooks

 

[QZP]

Guys why is co2(g) <--> co2(aq) a wrong equation!@?!@?!@?!?@!@?!@!@!

 

[SuchSmallHands]

Guys why is co2(g) <--> co2(aq) a wrong equation!@?!@?!@?!?@!@?!@!@!

Because it's not just carbon dioxide floating around in some water, it reacts with the water to give carbonic acid. Water is more than a medium here, it's a reactant.

 

[QZP]

jokes on you its not wrong, if anything more correct because it shows the solubility of CO2

increase pressure results in increase dissolution (note only gaseous on LHS)
increase temp decreases dissolution (since dissolution exothermic)

 

[enigma_1]

Guys why is co2(g) <--> co2(aq) a wrong equation!@?!@?!@?!?@!@?!@!@!

awwwww this is sad (

K coz you gotta show like Co2 reacting with water because of the carbonic acid equilibrium.

K DON'T QUESTIoN PLS ACCEPT IT sozz (

 

[QZP]

jokes on you its not wrong, if anything more correct because it shows the solubility of CO2

increase pressure results in increase dissolution (note only gaseous on LHS)
increase temp decreases dissolution (since dissolution exothermic)

 

[SuchSmallHands]

where did you learn this (don't say sample answer pls). cus i cant find anything about that in textbooks

Hypochlorite ions will bleach litmus paper, regardless of whether it's in textbooks it is true so stress less

 

[enigma_1]

jokes on you its not wrong, if anything more correct because it shows the solubility of CO2

increase pressure results in increase dissolution (note only gaseous on LHS)
increase temp decreases dissolution (since dissolution exothermic)

*facepalm*

 

[Hi there444]

where did you learn this (don't say sample answer pls). cus i cant find anything about that in textbooks

Bro think about it which other gas can you get from the nacl aqueous solution that would be acidic?

_/_/_

 

[SuchSmallHands]

jokes on you its not wrong, if anything more correct because it shows the solubility of CO2

increase pressure results in increase dissolution (note only gaseous on LHS)
increase temp decreases dissolution (since dissolution exothermic)

Ok man, write whatever makes you happy in the HSC. I'm sticking to my equation.

 

[cbaldilocks]

OMGGG FINALLYYYY please help

It's shiprekkting me ((

I am sure you know what you're doing a hell of a lot better than I do. At the moment my long answer replies to the options questions are as basic as "put the artefact in a basic solution and then but clay on it or something and wait 6 years. Corrosion is bad. Paint bridges. The end"

 

[iStudent]

Any of you doing Shipwrecks and Corrosion as your options topic?

I cannot for the life of me put the equations for rusting to memory

Me
I use the standard reduction tables to remember those.

 

[QZP]

Bro think about it which other gas can you get from the nacl aqueous solution that would be acidic?

_/_/_

Cl2 is acidic? what

 

[Hi there444]

Hypochlorite ions will bleach litmus paper, regardless of whether it's in textbooks it is true so stress less

Hypochlorite? Ocl-
? Where in the world does hyppchlorite form?[emoji23]

_/_/_

 

[enigma_1]

I am sure you know what you're doing a hell of a lot better than I do. At the moment my long answer replies to the options questions are as basic as "put the artefact in a basic solution and then but clay on it or something and wait 6 years. Corrosion is bad. Paint bridges. The end"

nahh man

Umm I'll try help you out and stuff, post questions here and I'll answer them if I can )

 

[QZP]

There is way too many people talking at once here

 

[enigma_1]

Hypochlorite? Ocl-
? Where in the world does hyppchlorite form?[emoji23]

_/_/_

idk if this is relevant

Cl2(g) + H2O(l) ----> HCl- (aq) + OCl- (aq) + H+(aq)


that's hypochlorite OCl-

 

[enigma_1]

There is way too many people talking at once here

ahahah it's good though