HSC 2012-2015 Chemistry Marathon (archive) (4 Viewers)

[Drsoccerball]

re: HSC Chemistry Marathon Archive

For sucrose, is the reaction in your previous post regarding sucrose? Or is that different reaction?

Its sucrose

 

[BlueGas]

re: HSC Chemistry Marathon Archive

Its sucrose

What would a procedure look like for oxidation of copper and dehydration of ethanol considering safety and justification?

 

[Drsoccerball]

re: HSC Chemistry Marathon Archive

What would a procedure look like for oxidation of copper and dehydration of ethanol considering safety and justification?

Get copper strips/copper shackles and in a fume cabinet put dilute sulfuric acid on it and watch the solution turn blue. Gloves and shiiettt.

Do the same for sucrose or ethanol

 

[BlueGas]

re: HSC Chemistry Marathon Archive

Get copper strips/copper shackles and in a fume cabinet put dilute sulfuric acid on it and watch the solution turn blue. Gloves and shiiettt.

Do the same for sucrose or ethanol

How about this dot point, "describe and explain the exothermic nature of sulfuric acid ionisation" how would you answer this if it was a question?

 

[Drsoccerball]

re: HSC Chemistry Marathon Archive

How about this dot point, "describe and explain the exothermic nature of sulfuric acid ionisation" how would you answer this if it was a question?

Well when water combines with sulfuric acid the heat produced is highly exothermic and can turn the water and shit into mist.

 

[porcupinetree]

re: HSC Chemistry Marathon Archive

How about this dot point, "describe and explain the exothermic nature of sulfuric acid ionisation" how would you answer this if it was a question?

Describe - the ionisation of sulfuric acid is a highly exothermic reaction, and if not performed with greatest care, can cause water in the solution to violently spit, boil, and create a dangerous acidic mist. Explain - concentrated sulfuric acid is virtually 100% molecular; upon ionisation, some of the covalent bonds within the molecule are broken, releasing vast amounts of energy (and thus heat).

 

[Mr_Kap]

re: HSC Chemistry Marathon Archive

Well when water combines with sulfuric acid the heat produced is highly exothermic and can turn the water and shit into mist.

Nice use of scientific terminology!

 

[Librah]

re: HSC Chemistry Marathon Archive

Describe - the ionisation of sulfuric acid is a highly exothermic reaction, and if not performed with greatest care, can cause water in the solution to violently spit, boil, and create a dangerous acidic mist. Explain - concentrated sulfuric acid is virtually 100% molecular; upon ionisation, some of the covalent bonds within the molecule are broken, releasing vast amounts of energy (and thus heat).

Breaking bonds don't release energy.

 

[Ekman]

re: HSC Chemistry Marathon Archive

Breaking bonds don't release energy.

That is quite true, breaking bonds in fact absorb energy (its an endothermic process).

 

[Mr_Kap]

re: HSC Chemistry Marathon Archive

That is quite true, breaking bonds in fact absorb energy (its an endothermic process).

So Can someone fix that response above?

 

[Kaido]

re: HSC Chemistry Marathon Archive

Well when water combines with sulfuric acid the heat produced is highly exothermic and can turn the water and shit into mist.

That's how we roll bro

 

[Kaido]

re: HSC Chemistry Marathon Archive

Breaking bonds don't release energy.

This hippo speaks the truth. This is the troll shit

 

[Kaido]

re: HSC Chemistry Marathon Archive

Alright, I'm interested in who can spit out the best bs:
Why and how do chemists collaborate? Make specific reference to chemical procedures you have investigated and describe, in detail, the roles of three distinct chemists (e.g. analytical, environmental etc.)

 

[sharoooooo]

re: HSC Chemistry Marathon Archive

Alright, I'm interested in who can spit out the best bs:
Why and how do chemists collaborate? Make specific reference to chemical procedures you have investigated and describe, in detail, the roles of three distinct chemists (e.g. analytical, environmental etc.)

Chemists need to collaborate for three main reasons:
-Different chemists specialise in different expertise and roles in order to complete a task. Thus, collaborating in a task such as an oil spill, is beneficial to effectively minimise the waste caused and reduce environmental impacts.
-Collaboration with other chemists ensures improved interpretation of results by reducing the chance of human errors.
-Collaboration improves reliability by repetition of task.

Gas-Liquid Chromatography:
-relies on differing solubility in order to separate mixtures by passing a 'mobile phase' over a 'stationary phase'
-detector at the end measures the amount that has passed through of the column where it is analysed and identified.
-it works as substances that readily dissolve in the stationary phase as it will experience more intermolecular interactions.

Analytical:
-Measure conc and amount of substance
Industrial:
-Monitors efficiency of industrial processes and designing processes to maximise yields and rates
Enviro:
-Analyses how substances interact with ecosystem

 

[porcupinetree]

re: HSC Chemistry Marathon Archive

Alright, I'm interested in who can spit out the best bs:
Why and how do chemists collaborate? Make specific reference to chemical procedures you have investigated and describe, in detail, the roles of three distinct chemists (e.g. analytical, environmental etc.)

Just a question: for the syllabus dot point 9.4.1.1 ("Outline the role of a chemist...and explaining a chemical principle that the chemist uses"), do you guys reckon we need to have a specific chemist (like an actual person), or just a generic description of any chemist working in that particular industry?
Also, in terms of the "chemical principle", do you guys reckon AAS counts as a chemical principle? Given that it's more to do with the quantised orbits of electrons, rather than actual chemical bonding? Thx.

 

[Ekman]

re: HSC Chemistry Marathon Archive

Just a question: for the syllabus dot point 9.4.1.1 ("Outline the role of a chemist...and explaining a chemical principle that the chemist uses"), do you guys reckon we need to have a specific chemist (like an actual person), or just a generic description of any chemist working in that particular industry?
Also, in terms of the "chemical principle", do you guys reckon AAS counts as a chemical principle? Given that it's more to do with the quantised orbits of electrons, rather than actual chemical bonding? Thx.

Although the dot point says to have one specific chemist, meaning you have to find an actual chemist who has to be working. I have heard that you need one male and one female chemist who have different roles.

In terms of the chemical principles, you can say AAS I guess. It got more to do with what kind of knowledge the chemist has when solving an issue. For example: knowledge of acid and base reactions in order to neutralise spills

 

[BlueGas]

re: HSC Chemistry Marathon Archive

Although the dot point says to have one specific chemist, meaning you have to find an actual chemist who has to be working. I have heard that you need one male and one female chemist who have different roles.

In terms of the chemical principles, you can say AAS I guess. It got more to do with what kind of knowledge the chemist has when solving an issue. For example: knowledge of acid and base reactions in order to neutralise spills

I'm sure there isn't going to be a question asking you: Name one "female" scientist...

 

[Ekman]

re: HSC Chemistry Marathon Archive

I'm sure there isn't going to be a question asking you: Name one "female" scientist...

First time for everything buddy

 

[leehuan]

re: HSC Chemistry Marathon Archive

If the exam asks that question I'm throwing out the marks. Or a fake John Smith. Because fact is if they ask that they have to consult all of their sources to know if your chemist is real. Which takes effort. Which makes the question unlikely to be asked.

 

[Mr_Kap]

re: HSC Chemistry Marathon Archive

.