Predictions for Chemistry 2014 HSC? (1 Viewer)

[enigma_1]

hahaha RIP engima. Wed, Thu and Friday you have exams!

Biology and 4u


It wasn't bad

im gonna fking dieee

5 exams in the space of 7 days

and yeah coz you do 4 unit, that's barely fair (((((((

 

[Queenroot]

im gonna fking dieee

5 exams in the space of 7 days

and yeah coz you do 4 unit, that's barely fair (((((((

You'll be fine.

 

[seventhroot]

I have a pretty good exam timetable

 

[IR]

Mostly correct stuff but the setting out should be improved on. The question starts by asking about the differences in structure so that's what you should begin with.

Oxygen is a non-polar molecule with a linear structure, with one double O=O covalent bond.
Ozone is a polar molecule which gives it its bent structure. It contains a coordinate covalent bond (O=O-O you should draw the molecules).

Then it asks for two differences in their properties:

Ozone's higher molar mass (3 Oxygen molecules instead of 2), means it has increased dispersion forces acting on it which gives it higher boiling and melting points than Oxygen.
Since Ozone is polar, it also has strong dipole-dipole forces between molecules , which makes it more soluble in water (also a polar molecule) than oxygen which is non-polar.

Other properties you could include:
Ozone is more reactive and is a stronger oxidising agent, which is due to its unstable structure.
Ozone is more easily decomposed than oxygen which is very stable. This is also due to ozone's unstable structure.

Hope this helps
Someone please correct me if I made any mistakes.

No you are right. I should structure. Thanks.

 

[Queenroot]

No you are right. I should structure. Thanks.

Make sure you structure well, sometimes a lot of marks are dependent purely on how you structured your answer.

 

[IR]

Make sure you structure well, sometimes a lot of marks are dependent purely on how you structured your answer.

Yes Thanks.

 

[faisalabdul16]

im gonna fking dieee

5 exams in the space of 7 days

and yeah coz you do 4 unit, that's barely fair (((((((

hahah that is not something I would like! You'll be fine!

The beauty of doing 4u maths, 2 other units are english leaving you with 4 more units (2 subjects).

All i have left is bio, chem and math exams hahahah

 

[enigma_1]

You'll be fine.

hahah that is not something I would like! You'll be fine!

The beauty of doing 4u maths, 2 other units are english leaving you with 4 more units (2 subjects).

All i have left is bio, chem and math exams hahahah

Thanks!! Ikr lol but then again, 2u maffs and business are barely subjects hahah!

I wish I did 10 units with 4u maths, my lyf would have been so much better.

Good luck with the rest of your exams!

 

[Zadss]

haha that 11 year old is gonna beat us all

is it true that a 75 raw mark scales you up to 90?

 

[strawberrye]

7 marker? What's it going to be guys?

A combination question which tests on the integration of knowledge across different modules

 

[QZP]

why do we use fume cupboard in bromine experiment?
not sure if because bromine toxic + release vapours or if cyclohexene/ane toxic + release vapours or both :/

 

[faisalabdul16]

why do we use fume cupboard in bromine experiment?
not sure if because bromine toxic + release vapours or if cyclohexene/ane toxic + release vapours or both :/

All chemicals used in the experiment are toxic

 

[faisalabdul16]

A combination question which tests on the integration of knowledge across different modules

ooo

What do you think the question would focus on?

 

[enigma_1]

why do we use fume cupboard in bromine experiment?
not sure if because bromine toxic + release vapours or if cyclohexene/ane toxic + release vapours or both :/

cyclohexane/ene release toxic fumes

 

[QZP]

All chemicals used in the experiment are toxic

what about vapour?

 

[QZP]

cyclohexane/ene release toxic fumes

what about bromine?

 

[i--N]

what about bromine?

what about vapour?

cyclohexane/ene release toxic fumes

All chemicals used in the experiment are toxic

.

 

[Crisium]

what about bromine?

Yes the cyclohexene, cyclohexane and bromine water solution are all toxic if they were to be inhaled and may cause irritation/burns when coming in contact with the skin.

On top of that some fume cupboards are fitted so that there is no natural light as the presence of U.V. Light will constitute a substitution reaction

 

[QZP]

yup no one answered my q yet

 

[Queenroot]

yup no one answered my q yet

which one