VCE Chemistry Question Thread

[Elizawei]

Hi,
Just wondering what catalysts we should know for organic reaction pathways. There are some in the textbook, but it also leaves many out. 

Thanks

-   H2 (hydrogenation) needs Nickle
-   adding H2O needs Phosphoric acid (H3PO4)
-   Halogens e.g Cl2 needs UV light
-   Converting alcohol to carboxylic acid  MnO4- or Cr2O72-  and  H+
-   Esterification needs Sulphuric acid (H2SO4)

[Rumena]

Hey I was just wondering if we are required to know about heart attacks and prostate cancer? Or just the key information about proteins as markers for disease?

[Swagadaktal]

Hey I was just wondering if we are required to know about heart attacks and prostate cancer? Or just the key information about proteins as markers for disease?

na u dont fam

[Mhysa]

Hi,
Just wondering what catalysts we should know for organic reaction pathways. There are some in the textbook, but it also leaves many out. 

Thanks

Not all these are catalysts but they are required in the reaction (when constructing reaction pathways, place them above or below the arrow). Catalysts
Alkene to Alkane - H2(g), Ni or Pt
Alkene to Chloroalkane - HCl, catalyst
Alkene to Alkanol - H20(g), H3PO4 at 400 Degrees
Alkane to Chloroalkane - Cl2(g), under the influence of UV light
Alkane to Alkanol - OH-
Alkanol to Carboxylic acid - H+ (aq), MnO4-(aq) or Cr2O7-(aq)
To form esters - H2SO4 (l)
Alkanol to Alkanamine - NH3(g), Alumina at 300 Degrees
Alkane to Alkanamine - NH3(g)
When forming Polymers, for VCE you do not need to write down the name of catalyst just "catalyst" on top of arrow

[SJS]

Thank you! 

[jyce]

I would just like to note to you guys that the only catalyst in organic reaction pathways that VCAA has ever asked for is H₂SO₄, which is a catalyst for esterification reactions. You do not need to know about any other catalysts (e.g. nickel, phosphoric acid). There are, however, other non-catalytic reagents you need to know such as Cl₂, MnO₄^- and Cr₂O₇^2-.

[knightrider]

What are the functional groups of acetic anhydride?

[Swagadaktal]

Which exams are still relevant to this study design (same as last years one)?
And does anyone have a list of recommendations of which exams to do?

[Rumena]

Hey is electrophoresis and PCR out of the study design? Because my teacher told us not to read that part in our textbook

[JellyBeanz]

Hey is electrophoresis and PCR out of the study design? Because my teacher told us not to read that part in our textbook

Neither electrophoresis nor PCR is mentioned in the study design for units 3/4 but knowing the simple steps would best work in your favour if you can.

[Adequace]

Hey guys, I need help for a question http://imgur.com/GmIef5a

For b, why is this a polar molecule even though it seems symmetrical?

[Swagadaktal]

Hey guys, I need help for a question http://imgur.com/GmIef5a

For b, why is this a polar molecule even though it seems symmetrical?

Coz molecules are 3-D, and 2 of the outer elements are different from the other one (2 white 1 red with a black in the centre). If it were 3 white outside then it would be non-polar, but because the third element has a different electronegativity, it's not perfectly symmetrical.
Yahoo answers usually have random crap about angles so ima assume the diff in electronegativity changes the shape of the thing
not sure if this helped lol

[jyce]

Which exams are still relevant to this study design (same as last years one)?
And does anyone have a list of recommendations of which exams to do?

The 2013, 2014 and 2015 VCAA exams are the only ones that follow the exact structure of the 2016 exam. As there are only three of these I highly recommend not touching them until towards the end of the year. For now, do the VCAA 2008-2012 exams. These are half exams (i.e. are divided into Units 3 and Units 4) but basically contain all of the same content. The only differences are in Unit 3 you no longer need to know the instrumentation of chromatographic and spectroscopic techniques, fractional distillation, proteins as markers of disease and DNA profiling, and in Unit 4 you will no longer be assessed in the exam on the industrial production of a selected chemical.

[Swagadaktal]

The 2013, 2014 and 2015 VCAA exams are the only ones that follow the exact structure of the 2016 exam. As there are only three of these I highly recommend not touching them until towards the end of the year. For now, do the VCAA 2008-2012 exams. These are half exams (i.e. are divided into Units 3 and Units 4) but basically contain all of the same content. The only differences are in Unit 3 you no longer need to know the instrumentation of chromatographic and spectroscopic techniques, fractional distillation, proteins as markers of disease and DNA profiling, and in Unit 4 you will no longer be assessed in the exam on the industrial production of a selected chemical.

thanks for the response, should I not touch any of the exams pre 2008?
And if someone hypothetically had a hypothetical stash of exams on a dropbox could they please hypothetically message me.
hypothetically.

[jyce]

thanks for the response, should I not touch any of the exams pre 2008?

You can definitely take a look at the VCAA exams prior to 2008. They just stray quite a bit from the current study design. For example, pre-2008 Unit 3 exams contain what is now a mixture of Units 3 and 4 material. There's also content in pre-2008 Unit 4 exams that is now taught in Unit 1, etc.