Predictions for Chemistry 2014 HSC? (4 Viewers)

[Queenroot]

Does anyone know if one gets marked down for having extra info (info not required)

Yeah that's why I told you not to write things that aren't relevant to the question

 

[photastic]

Oo I'm a little rusty with Solvay but i'll bite (without looking through my notes!)

The Solvay Process describes the industrial conversion of the raw materials ammonia, limestone and brine into sodium carbonate over a series of steps. The net chemical reaction that occurs is;
NaCl + CaCO3 --> Na2CO3 + CaCl2

While there is some market for the calcium chloride byproduct, the supply exceeds the demand. This is an issue as if it is dumped into rivers and waterways it can significantly increase the level of TDS, hence reducing water quality and negatively affecting the natural ecosystem. This issue is addressed through delivering the calcium chloride waste into a 'settling pond' where it does not affect local water systems. The water used during the formation of NaHCO3 in the Solvay process is heated to high temperatures, and can cause thermal pollution if dumped in rivers and waterways, resulting in decreased oxygen solubility and threatening aquatic life. Hence, the water used in the process must be sufficiently cooled before being discharged into the environment. The Solvay process is efficient in the sense that the majority of the raw materials (such as ammonia) are recycled and thus resource depletion is kept to a minimum (?)

Guys I feel like I know most of the Chem concepts but my articulation is terrible. I really don't want to lose marks cos of how I phrase things I need your help, plz gib more practice questions

Unbalanced equation so no band 6

 

[emilios]

Unbalanced equation so no band 6

OH SHIT i actually would've got that wrong lol wtf.

 

[faisalabdul16]

Yeah that's why I told you not to write things that aren't relevant to the question

Weird marking criterias for simple question

 

[photastic]

Weird marking criterias for simple question

Explains why its hard to get high raw marks in science.

 

[emilios]

Actual picture taken from the HSC Chemistry Marking Panel.

 

[Queenroot]

Weird marking criterias for simple question

Simplest questions is usually where most marks are lost. Be on point.

 

[seventhroot]

Actual picture taken from the HSC Chemistry Marking Panel.

View attachment 30961

only when you do exams

 

[emilios]

only when you do exams

y the h8 square < /3

 

[photastic]

y the h8 square < /3

NaCl + CaCO3 --> Na2CO3 + CaCl2

.

 

[emilios]

.

y u bein so salty

huehuehuehuehuehu

 

[seventhroot]

y the h8 square < /3

that's so rood. i wouldn't refuse advice cos you didn't get a B6.

I would refuse advice cos you're square.

you started it

I had no problem

 

[emilios]

you started it

I had no problem

not my fault your banter is lacking...

 

[Queenroot]

you started it

I had no problem

check your fb

and stop derailing

 

[seventhroot]

check your fb

and stop derailing

soz boss

square out yo

 

[faisalabdul16]

Explains why its hard to get high raw marks in science.

Very true! Chem has been 72-76 generally.

Simplest questions is usually where most marks are lost. Be on point.

Yeah true!


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Stop derailing guys

 

[photastic]

Very true! Chem has been 72-76 generally.

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

 

[emilios]

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

Last year was remarkably easier than other years though. B6 Cutoff is usually 72

 

[photastic]

Last year was remarkably easier than other years though. B6 Cutoff is usually 72

Is there a way to determine the difficulty of exams???

 

[faisalabdul16]

With easy papers come anal marking.