HSC 2012-2015 Chemistry Marathon (archive) (1 Viewer)

[Drsoccerball]

re: HSC Chemistry Marathon Archive

Probably wouldn't get full marks tbh. Bit too vague/ambiguous.

Its out of one...What i would of said is: The purpose of a salt bridge is to complete the circuit by allowing a place for the ions to travel.

 

[Librah]

re: HSC Chemistry Marathon Archive

Its out of one...What i would of said is: The purpose of a salt bridge is to complete the circuit by allowing a place for the ions to travel.

That's not the purpose of a salt bridge though lol

 

[Drsoccerball]

re: HSC Chemistry Marathon Archive

Omg yasssss

#nostalgia



Ikr lol

Whoever asked, just use the term "electrical neutrality" and you're good

The answers say : The salt bridge allow ions to move between half-cells to complete the circuit

 

[enigma_1]

re: HSC Chemistry Marathon Archive

The answers say : The salt bridge allow ions to move between half-cells to to prevent the anode from becoming too positive and the cathode from becoming negative by maintaining electrical neutrality

Ftfy

 

[Drsoccerball]

re: HSC Chemistry Marathon Archive

Post some questions guys

 

[enigma_1]

re: HSC Chemistry Marathon Archive

What is a suitable salt bridge and why? (2 marks)

As in like what should the salt bridge consist of and why

 

[Queenroot]

re: HSC Chemistry Marathon Archive

What is a suitable salt bridge and why? (2 marks)

As in like what should the salt bridge consist of and why

salt

 

[Drsoccerball]

re: HSC Chemistry Marathon Archive

What is a suitable salt bridge and why? (2 marks)

As in like what should the salt bridge consist of and why

A suitable salt bridge is one that does not react with the anions or cations. But why ?

 

[Ekman]

re: HSC Chemistry Marathon Archive

What is a suitable salt bridge and why? (2 marks)

As in like what should the salt bridge consist of and why

A suitable salt bridge is a piece of paper soaked in potassium nitrate, which provides a buffer for ion buildup on the electrode as well as replenishing the charge of the electrolytes, plus the K+ ions don't react with the solutions as well. Also the K+ and NO3- ions provide a buffer for neutrality, thus delaying the ion transfer between the two electrodes.

 

[SuchSmallHands]

Chemistry marathon 2015

A suitable salt bridge is a piece of paper soaked in potassium nitrate, which provides a buffer for ion buildup on the electrode as well as replenishing the charge of the electrolytes

What else about KNO3 makes it suitable? There's a factor you've left out you'd probably need to mention for two marks. To give you a hint, what are group one metals and nitrates know for?

 

[Drsoccerball]

re: HSC Chemistry Marathon Archive

What else about KNO3 makes it suitable? There's a factor you've left out you'd probably need to mention for two marks. To give you a hint, what are group one metals and nitrates know for?

The valencys

 

[enigma_1]

re: HSC Chemistry Marathon Archive

salt

lol

A suitable salt bridge is a piece of paper soaked in potassium nitrate, which provides a buffer for ion buildup on the electrode as well as replenishing the charge of the electrolytes, plus the K+ ions don't react with the solutions as well.

Nah something else

Francium due to its explosive properties, thus has the potential to create large amounts of energy.

wat

 

[photastic]

re: HSC Chemistry Marathon Archive

The valencys

Think of solubility.

 

[Drsoccerball]

re: HSC Chemistry Marathon Archive

Think of solubility.

Are they both soluble not sure

 

[SuchSmallHands]

Chemistry marathon 2015

Think of solubility.

Lol I was trying to make them get it themselves, but I think this whole thread is mostly going to be 14ers answering questions and queen and square derailing hard. Basically the same as the last marathon lol

 

[strawberrye]

re: HSC Chemistry Marathon Archive

What else about KNO3 makes it suitable? There's a factor you've left out you'd probably need to mention for two marks. To give you a hint, what are group one metals and nitrates know for?

So tempted to answer this, but I will resist the temptation and leave it to the 2015er's

Will start with a simple question:

Describe and evaluate the procedure you used to compare the heat of combustions of various fuels in your first hand investigations. (5 marks)

 

[SuchSmallHands]

re: HSC Chemistry Marathon Archive

Are they both soluble not sure

You really need to learn the solubility rules.

 

[Drsoccerball]

re: HSC Chemistry Marathon Archive

You really need to learn the solubility rules.

Ive never done any questions or any theory with solubility rules....

 

[SuchSmallHands]

re: HSC Chemistry Marathon Archive

Ive never done any questions or any theory with solubility rules....

It should have been covered in the year 11 course. It is absolutely vital you learn them before the HSC.

 

[Ekman]

re: HSC Chemistry Marathon Archive

Well when the KNO3 ionizes in water, NO3- is always soluble, no matter what ions join with it.