Predictions for Chemistry 2014 HSC? (10 Viewers)

[emilios]

Anything that hasn't yet been asked? I'm feeling a couple of those obscure pracs that no one ever does coming up.

 

[Queenroot]

inb4allpredictionsarewrong

 

[seventhroot]

imo; I think they will ask something on titration this year

 

[faisalabdul16]

For the long response, i reckon probably something to do with ethylene or a biopolymer.

Hopefully the test is straightforward.

 

[Queenroot]

imo; I think they will ask something on titration this year

inb4notitrationquestions

 

[seventhroot]

inb4notitrationquestions

inb4Ididn'tevendoHSCchemistry

 

[dan964]

Ozone

 

[FireRunning]

Seven Marker on Solvay Process.

 

[screwuhsc]

Fritz haber. Don't think bromine test iTs just too common

 

[Kurosaki]

WHAT IS THIS

where in the course is this from

shit I've never come across this. Is this just like an extra out-of-syllabus thing that textbooks put in or something

It's not your option topic , don't worry haha.

 

[enigma_1]

yeah lol realised after I posted. I always forget option topics exist LOL

LOL omg same

 

[photastic]

Combine Haber's impact of his time and today's actions when dealing with chemistry in the environment/society.

 

[faisalabdul16]

Ozone

Nah last year they asked ozone 5+ marks I think

 

[the wobbulator]

i'll predict a lot of esters questions or those pracs in eutrophication/water quality questions

 

[emilios]

i'll predict a lot of esters questions or those pracs in eutrophication/water quality questions

idk refluxing made up like 6 marks of last years paper, doubt it'll be on esterification pracs.

agreed on the eutrophication/water quality prac questions, which is unfortunate since i was away when we did them in class haha just my luck

 

[faisalabdul16]

idk refluxing made up like 6 marks of last years paper, doubt it'll be on esterification pracs.

agreed on the eutrophication/water quality prac questions, which is unfortunate since i was away when we did them in class haha just my luck

The pracs are simple. Most take like 2 seconds.

You have to elaborate on what i've written below, but in simple terms.

Water Hardness - chuck soap flakes in soft water and hard water. Soft water = froth, Hard water = small powder (scum aka calcium stearate) at bottom of test tube. Titration with EDTA (also not done by most schools, just got to know the ratio is 1:1, ratio of Calcium ions to EDTA ions
Turbidity - using a turbidity column, pour water in until you cannot see the "X" at the bottom, read of measurement on the column.
pH - pH meter or pH probe attached to a data logger.
Ions - precipitation
BOD - Gather water, measure the dissolved oxygen concentration. Place in brown blag, place in the dark for 5 days. Measure DO again, difference in DO levels = BOD.
Total Dissolved Solids - using a conductivity meter or evaporation of water sample.
DO - using oxygen sensitive electrode or Winkler titration (titration which you do not do at school, too long and complex)

 

[screwuhsc]

yea ikr ahha hoping theres not too much on water

 

[Queenroot]

yea ikr ahha hoping theres not too much on water

Wat is the molecular stucture of water
go

 

[faisalabdul16]

Wat is the molecular stucture of water
go

so hard

 

[iStudent]

The pracs are simple. Most take like 2 seconds.

You have to elaborate on what i've written below, but in simple terms.

Water Hardness - chuck soap flakes in soft water and hard water. Soft water = froth, Hard water = small powder (scum aka calcium stearate) at bottom of test tube. Titration with EDTA (also not done by most schools, just got to know the ratio is 1:1, ratio of Calcium ions to EDTA ions
Turbidity - using a turbidity column, pour water in until you cannot see the "X" at the bottom, read of measurement on the column.
pH - pH meter or pH probe attached to a data logger.
Ions - precipitation
BOD - Gather water, measure the dissolved oxygen concentration. Place in brown blag, place in the dark for 5 days. Measure DO again, difference in DO levels = BOD.
Total Dissolved Solids - using a conductivity meter or evaporation of water sample.
DO - using oxygen sensitive electrode or Winkler titration (titration which you do not do at school, too long and complex)

My school actually ended up doing both of those titrations (edta+Winkler). But teacher said we don't have to know them.