Predictions for Chemistry 2014 HSC? (2 Viewers)

[faisalabdul16]

If you are talking about band 6, should aim for 80s (last year says it all to all science)

Yeah 80 will definitely get the 90 but probably would be 91-92

 

[photastic]

Yeah 80 will definitely get the 90 but probably would be 91-92

Or get 90 to guarantee it. You never know.

 

[faisalabdul16]

Or get 90 to guarantee it. You never know.

Unlikely cut off will be that high.

Okay let's get back to asking each other questions so we can critique them and learn from them. I'll start off -

Evaluate ethanol as an alternative source of fuel. - 5 marks.

 

[Queenroot]

With easy papers come anal marking.

.

 

[faisalabdul16]

.

Wot

 

[photastic]

Unlikely cut off will be that high.

Okay let's get back to asking each other questions so we can critique them and learn from them. I'll start off -

Evaluate ethanol as an alternative source of fuel. - 5 marks.

Advantages - More likely undergoes complete combustion (less toxic emission such as CO and C, insert equations), Renewable (made from biomass duh), carbon neutral (Input = output), theres a lot.
Disadvantages - Expensive to produce (fermentation and distillation is rip, insert equations), requires arable land (stinky and wth we don't enough land anyway, can lead to soil erosion), lower heat of combustion (petrol is still better), energy modifications (not really today), blah blah
Judgement - For now, piss off ethanol.

 

[faisalabdul16]

Advantages - More likely undergoes complete combustion (less toxic emission such as CO and C, insert equations), Renewable (made from biomass duh), carbon neutral (Input = output), theres a lot.
Disadvantages - Expensive to produce (fermentation and distillation is rip, insert equations), requires arable land (stinky and wth we don't enough land anyway, can lead to soil erosion), lower heat of combustion (petrol is still better), energy modifications (not really today), blah blah
Judgement - For now, piss off ethanol.

Loving that judgement

 

[Queenroot]

Wot

what

 

[photastic]

Loving that judgement

But it's true, ethanol is not economically viable and also makes the focus area pretty boring tbh.

 

[Queenroot]

Advantages of ethanol - it gets me drunk

 

[faisalabdul16]

Explain why there is a need for constant monitoring of water supplies in catchments.

 

[Queenroot]

Explain why there is a need for constant monitoring of water supplies in catchments.

So no one pees in there

 

[seventhroot]

So no one pees in there

someone please write this in an exam lol

 

[faisalabdul16]

HAHAH okay you guys ask questions so 14ers can answer

 

[Queenroot]

HAHAH okay you guys ask questions so 14ers can answer

Why Spectrometry important to the environment
go

 

[faisalabdul16]

Why Spectrometry important to the environment
go

AAS?

 

[Queenroot]

AAS?

Yes

 

[faisalabdul16]

Yes

Too tired to answer properly

AAS detects metal concentrations up to ppb
- The advent of this technology has unravelled information about trace elements
- Trace elements are those required by organisms and plants in small amounts for survival
- AAS is important to the environment because it allows scientists to know whether plants or animals are lacking an essential trace element (e.g cobalt) so that we can give supplements and so that they can survive

Example = sheep in Western Australia

 

[iStudent]

Also heavy metals (lead and all that)

 

[faisalabdul16]

Also heavy metals (lead and all that)

Yeah it bioaccumulates in organisms once consumed and makes it way up the food chain causing harm. Etc