Module 3 questions (3 Viewers)

[Wohzazz]

Hehe, i dug up more question working through module 3 that i need answers to

1. Why does oxalic acid written as (H2C2O4.2H2O)? Why isn't hydrochloric acid written like that?
2. When are molecules draw bent in Lewis dot diagrams?(Example being O3)
3. Why does SO2 have a double covalent bond and a coordinate bond rather than two single covalent bonds?
4. What is the octet rule? Isn't that like in music?
5. Why does solubility of gas decrease with rising temperature?

 

[abdooooo!!!]

hahaha.... im not gonna answer any.

 

[Wohzazz]

why do i have a feeling noone's going to answer this

 

[abdooooo!!!]

thats because none of your questions belong to the syllabus... and most 03ers here are rote learners with no knowledge of actual chemistry.

wait for Xayma... im too tired

 

[kimmeh]

Originally posted by Wohzazz
why do i have a feeling noone's going to answer this

"normal" 04ers arent up to module 3 yet as well we've only just finished the first module

 

[Wohzazz]

Originally posted by abdooooo!!!
thats because none of your questions belong to the syllabus... and most 03ers here are rote learners with no knowledge of actual chemistry.

wait for Xayma... im too tired

how can your rote learn all the whole chemistry course without understanding most of it..i'm reading stuff and i'm like how where did this come from? why is it like this?etc.

Originally posted by kimmeh
"normal" 04ers arent up to module 3 yet as well we've only just finished the first module

true, but i just want a head start so i decided to read the text book..it doesn't take a smartass to read and understand 'most' of the HSC topics..plus was kind of hoping 2003ers will help out

 

[abdooooo!!!]

Originally posted by Wohzazz
how can your rote learn all the whole chemistry course without understanding most of it..i'm reading stuff and i'm like how where did this come from? why is it like this?etc.

ahahaha... you newbie.

have you ever seen the hsc chemistry stage 6 syllabus?

edit: haven't you noticed that no one responded to your thread before except for me and Xayma? ...the only threads the 03ers respond to is those one with the syllabus dot point.

 

[Xayma]

Originally posted by Wohzazz
5. Why does solubility of gas decrease with rising temperature?

This one took me a few minutes to find out why? I never bothered to find out but now it makes sense.

2nd Law of Thermodynamics... Heat will flow downhill. The solution will heat up the gases dissolved in them, giving them more energy and hence they are more likely to be in a more disorded state (ie gas) then in an aqueous solution.

This also explains why most solids will increase in solubility since an aqueous state is more disorded then a solid state.

 

[Wohzazz]

Originally posted by abdooooo!!!
ahahaha... you newbie.

have you ever seen the hsc chemistry stage 6 syllabus?

mind you i've answered most of the dot points for the core modules, if i needed help with them, i would of just look at someone's summary or go to the CSU site.....the only reason i'm asking these questions is to because i'm curious of the ideas and stuff presented thrown at me by the text book..that way i can understand and remember stuff easier if it all logical...and i have been taught that chemistry is logical like physics and maths

 

[Xayma]

Originally posted by Wohzazz
4. What is the octet rule? Isn't that like in music?

Lots of breaking of this rule, states that electrons will try to lose or gain electrons to get 8 electrons in its outer shell.

Ill just keep editing the answers in here so it doesnt go over multiple pages.

Originally posted by Wohzazz
2. When are molecules draw bent in Lewis dot diagrams?(Example being O3)

I think this is because its the only way you will show the bonding. Eg O3 can not be shown in a straight line as the molecule is a ringish sort of shape (there is no end to it). Things like benzene etc will have to be shown as rings etc as well. Whereas H2O can be shown in a line as there are ends to the molecule.

Originally posted by Wohzazz
1. Why does oxalic acid written as (H2C2O4.2H2O)? Why isn't hydrochloric acid written like that?

Well for a start you wont find hydrochloric acid like that because it is in an aqueous solution and it isnt hydrated. (Ill find the answer soon).

Stuff it Ill do it in seperate posts because its hard to do it just editing.

 

[kimmeh]

Originally posted by Wohzazz
true, but i just want a head start so i decided to read the text book..it doesn't take a smartass to read and understand 'most' of the HSC topics..plus was kind of hoping 2003ers will help out

ahah your key word was read. not answer questions yeah i said that too. i wanted a head start.. but mehh.. couldnt be bothered

 

[abdooooo!!!]

Originally posted by Wohzazz
mind you i've answered most of the dot points for the core modules, if i needed help with them, i would of just look at someone's summary or go to the CSU site.....the only reason i'm asking these questions is to because i'm curious of the ideas and stuff presented thrown at me by the text book..that way i can understand and remember stuff easier if it all logical...and i have been taught that chemistry is logical like physics and maths

nah... im not saying chem is not logical man... i love chem, phy, math. its just that if you don't want to do any chem or science related degrees in uni... don't bother studying chem. you find knowing more is actually bad for your hsc. thats what i've found out after being through hsc chem once.

edit: bio is more logical... its the best

 

[kimmeh]

Originally posted by abdooooo!!!
knowing more is actually bad for your hsc. thats what i've found out after being through hsc chem once.

i dont know whether that applies for maths.. but you are allowed to apply 4 unit knowlegde for your 3 unit exam. though i wouldnt waste my time. i'd just stick to what i'd need to know and work really hard on that, making sure i'd get the marks

 

[Wohzazz]

Originally posted by abdooooo!!!
nah... im not saying chem is not logical man... i love chem, phy, math. its just that if you don't want to do any chem or science related degrees in uni... don't bother studying chem. you find knowing more is actually bad for your hsc. thats what i've found out after being through hsc chem once.

sorry..why is knowing more bad? is it because you might get tempted to include it in your answers thus wasting time with irrelevant information (well not necessary to get the marks anyway)

 

[Wohzazz]

Originally posted by kimmeh
i dont know whether that applies for maths.. but you are allowed to apply 4 unit knowlegde for your 3 unit exam. though i wouldnt waste my time. i'd just stick to what i'd need to know and work really hard on that, making sure i'd get the marks

i find myself doing implicit differientation for stuff like finding tangents and in parametrics, duh!

 

[abdooooo!!!]

Originally posted by kimmeh
i dont know whether that applies for maths.. but you are allowed to apply 4 unit knowlegde for your 3 unit exam. though i wouldnt waste my time. i'd just stick to what i'd need to know and work really hard on that, making sure i'd get the marks

i don't think so kim... hsc math is different to hsc chem. but i've heard stories where students was deducted marks in math because their workings was too advanced for the markers.

 

[kimmeh]

Originally posted by Wohzazz
i find myself doing implicit differientation for stuff like finding tangents and in parametrics, duh!

*thumbs up*

Originally posted by abdooooo!!!
i don't think so kim... hsc math is different to hsc chem. but i've heard stories where students was deducted marks in math because their workings was too advanced for the markers.

i have no idea..some teachers have told em that i can be penalised for using 4 unit methods for 3 unit.. others say you wont .. so...mehh i dunnooe... i think it depends on your school and how they decide to mark things. but i think the actual HSC exam, it doesnt matter. but remeber, the ext 1 and ext 2 course is totally different

 

[Wohzazz]

Originally posted by Xayma
Lots of breaking of this rule, states that electrons will try to lose or gain electrons to get 8 electrons in its outer shell.

{/B]

oh, so achieving noble gas config

Originally posted by Xayma

I think this is because its the only way you will show the bonding. Eg O3 can not be shown in a straight line as the molecule is a ringish sort of shape (there is no end to it). Things like benzene etc will have to be shown as rings etc as well. Whereas H2O can be shown in a line as there are ends to the molecule.

hmm don't really get it, you can always draw O3 in a straight line

 

[kimmeh]

Originally posted by Wohzazz
oh, so achieving noble gas config

:uhhuh: this was kind of in prelim stuff so much for reading ahead.. looks like you've left a fair bit out

 

[abdooooo!!!]

Originally posted by Wohzazz
sorry..why is knowing more bad? is it because you might get tempted to include it in your answers thus wasting time with irrelevant information (well not necessary to get the marks anyway)

tempted... you want to so badly... like they ask you a question on the haber process... you think they want something hardcore but the marking guideline just wants you to the know the most basic thing, like its: exothermic, 1 mark, its in a equilibrium, 1mark, mole on one side outweighs the other, 1mark... etc. as i said no need to understand.

edit: when i answer a question i try to explain actually why this happens and stuff and forget to write the keywords of death like: "exothermic"