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Predictions for Chemistry 2014 HSC? (1 Viewer)

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Cut down on why CFC's are used, unnecessary. You didn't define what Ozone depletion is. I would give it 4/6.
hahaha if it's 6 marks you have to explain everything.

Tbh i don't think a mark is awarded to defining what ozone depletion is, the answer is within the two words.

you're not going to so ozone depletion is the deterioration of ozone concentration because the "depletion" tells you that it is reducing.

If it were 6 marks -

1 mark - stating what a chlorofluorocarbon is
1 mark - providing why it was used (you don't mention a compound without stating why it was used)
1 mark - all necessary equations
1 mark - why chlorofluorocarbons break down in the stratosphere and not tropo
1 mark - why is ozone depletion harmful (which i did not write about because i wasn't aware of your lucrative and secreting marking scheme)
1 mark - how it is removed
 
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seventhroot

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hahaha if it's 6 marks you have to explain everything.

Tbh i don't think a mark is awarded to defining what ozone depletion is, the answer is within the two words.
r u questioning the chem god m9?

outb4hellrainsdownonyou
 

Queenroot

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hahaha if it's 6 marks you have to explain everything.

Tbh i don't think a mark is awarded to defining what ozone depletion is, the answer is within the two words.

you're not going to so ozone depletion is the deterioration of ozone concentration because the "depletion" tells you that it is reducing.
If you were going to explain everything then you might as well have explained the effects of Ozone depletion too and why it is a problem. You don't because that's not what the question asked for.

r u questioning the chem god m9?

outb4hellrainsdownonyou
.
 
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hahaha if it's 6 marks you have to explain everything.

Tbh i don't think a mark is awarded to defining what ozone depletion is, the answer is within the two words.

you're not going to so ozone depletion is the deterioration of ozone concentration because the "depletion" tells you that it is reducing.

If it were 6 marks -

1 mark - stating what a chlorofluorocarbon is
1 mark - providing why it was used (you don't mention a compound without stating why it was used)
1 mark - all necessary equations
1 mark - why chlorofluorocarbons break down in the stratosphere and not tropo
1 mark - why is ozone depletion harmful (which i did not write about because i wasn't aware of your lucrative and secreting marking scheme)
1 mark - how it is removed
.
If you were going to explain everything then you might as well have explained the effects of Ozone depletion too and why it is a problem. You don't because that's not what the question asked for.
If i knew it was 6 marks, i would have.

.
 

seventhroot

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HSC 2012 - Question 33 | (6 marks)

"Chemists can assist in reversing or minimising the environmental problems caused by technology and the human demand for products and services"

With reference to this statement, assess the need for chemists to collaborate when monitoring the environmental impact of a named electrochemical cell.
 

Queenroot

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And for everyone else, Yes I didn't get a Band 6, but a whole extra year of Chemistry has done me well. My advice is still relevant and valuable.
 

Queenroot

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HSC 2012 - Question 33 | (6 marks)

"Chemists can assist in reversing or minimising the environmental problems caused by technology and the human demand for products and services"

With reference to this statement, assess the need for chemists to collaborate when monitoring the environmental impact of a named electrochemical cell.
inb4AD
 

seventhroot

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And for everyone else, Yes I didn't get a Band 6, but a whole extra year of Chemistry has done me well. My advice is still relevant and valuable.
this; some people on the forums blatantly say [paraphrasing] "you didn't get a band 6 in physics; your help is not worthwhile" and I'm like ._.

so fk y'all 2014ers and take all the help you can get
 
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HSC 2012 - Question 33 | (6 marks)

"Chemists can assist in reversing or minimising the environmental problems caused by technology and the human demand for products and services"

With reference to this statement, assess the need for chemists to collaborate when monitoring the environmental impact of a named electrochemical cell.
Very ugly question.

Through collaboration, chemists can assist in reversing or minimising environmental problems caused by technology and the human demand for products and services. Collaboration in general, provides the expertise of different branches of Chemistry and results in either better products, or an increase in the safety of humans and the environment while using the particular product. The growth of the car industry has prompted efficient and cheaper batteries to be used that last a long time and an example of an electrochemical cell (battery) which is used is the lead-acid cell battery.
Anode - Pb ions + sulfate ions ----> lead sulfate and 2 electrons
Cathode - Lead oxide + 4 hydrogen ions + sulfate ion + 2 electrons ----> lead sulfate + 2 water.
Electrolyte - sulfuric acid.

The lead acid cell is widely used worldwide as car batteries and there is a need for chemists to collaborate when monitoring the “dumping” of these batteries due to the contents inside that can pose a threat to not only the environment but also humans. The collaboration between an environmental chemist and an analytical chemist can assist in minimising the environmental problems caused by this electrochemical cell. An environmental chemist can monitor the levels of sulfuric acid in the soil levels of particular dumping sites and judge whether the levels are too high and if action must be taken. If sulfuric acid enters waterways through runoffs, an environmental chemist can identify that this has occurred through the decrease in pH of water, through the death of fish who are unable to live in acidic environments. An analytical chemist, monitors the pollution of lead in the environment through a meticulous machine known as atomic absorption spectroscopy which measures the concentration of metal ions up to parts per billion in water, soil or air samples. Lead is a toxic heavy metal which bioaccumulates in organsims and in the human body, causing significant brain damage, and in young children mental retardation. Thus the collaboration between an environmental chemist and an analytical chemist can result in new plans and methods of disposing these electrochemical cells which are less harmful to the environment and can still be used by individuals without being removed. Collaboration allows for quicker and stronger forms of safety precautions

I gave up at the end, i don't like this question hahahaha
 

emilios

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this; some people on the forums blatantly say [paraphrasing] "you didn't get a band 6 in physics; your help is not worthwhile" and I'm like ._.

so fk y'all 2014ers and take all the help you can get
that's so rood. i wouldn't refuse advice cos you didn't get a B6.

I would refuse advice cos you're square.
 

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