Shipwrecks (1 Viewer)

[bayan92]

Discuss answers here.

 

[GUSSSSSSSSSSSSS]

lol this isnt so much of an answer but:

first question: WTF!! lolol

 

[annabackwards]

lol this isnt so much of an answer but:

first question: WTF!! lolol

Yeah, i got part 1 as aluminium but for the 2nd part i made up stuff :/

For the silver plating, did you guys just make an electrolytic cell with the spoon as the cathode and Silver Nitrate electrolyte?

 

[Marina89]

Yeah I did that but I didn't know what anode to use.. what did you use?

 

[bayan92]

Yer...

Platinum (anode) - graphite/stainless steel
Artifact (cathode)
Silver nitrate - electrolyte

 

[GUSSSSSSSSSSSSS]

Yeah I did that but I didn't know what anode to use.. what did you use?

any inert metal =S i just used stainless steel like the stimulus piece given above

Yeah, i got part 1 as aluminium but for the 2nd part i made up stuff :/

For the silver plating, did you guys just make an electrolytic cell with the spoon as the cathode and Silver Nitrate electrolyte?

hahaha yea first part was nice n easy,,,,but in the second i was WTF?!?!?!?! and just described uses of: more suitable metals, coating with less reactive metals, and painting as methods of protection =S

 

[annabackwards]

I just said an inert graphite electrode was used as the anode.

And then i have equations showing Ag+ getting reduced and water being oxidised.

I'm hoping i'm right, made it up on the spot XD

hahaha yea first part was nice n easy,,,,but in the second i was WTF?!?!?!?! and just described uses of: more suitable metals, coating with less reactive metals, and painting as methods of protection =S

I compared it to aluminium and the inside of aluminium cans has to coated in something else as well because otherwise it'd react with acids in soft drinks etc etc... gah such a dodgy answer lol

 

[bayan92]

My friend said that he wrote now the Laws of Electrolysis by Faraday. Was this necessary do you think?

 

[sam5]

FUCK

I put the negative wire to the inert thing and the positive wire to the spoon (shoulda had other way round).

How many marks would i lose for doin that?

 

[bayan92]

FUCK

I put the negative wire to the inert thing and the positive wire to the spoon (shoulda had other way round).

How many marks would i lose for doin that?

Out of 3. So you will probably get 1 for having the right idea?

 

[Dr. Zoidberg]

lols, i wrote about molten silver for electrolysis with the spoon and a platinum electrode

 

[osamaelias]

7 Marker was easily predictable this year , in 2008 nothing from focus area 1-4 was included , yeh nothing.

So 100% it would have been from there as i expected , and it did.

As for the question asked about silver , it is an exact question ripped from conquering chemistry , have a look at it.

Make the spoon, anode , and thus the silver gets electrons from it , therfore plating on it.

Goodluck

 

[GUSSSSSSSSSSSSS]

7 Marker was easily predictable this year

actually i really struggled to include equations in the 7 mark question on the scientists

included like maybe 4 at most

makin me a bit nervous lol

 

[kwokie]

Reduction occurs at cathode, so shouldnt u make the spoon cathode so Ag ions get reduced there to form ag solid. but this paper was fucking hard i had no idea

 

[study-freak]

actually i really struggled to include equations in the 7 mark question on the scientists

included like maybe 4 at most

makin me a bit nervous lol

no need to include equations for that question

 

[mitchwong650]

Man i pumped this section. i loved the 7 marker on the scientists haha.

although i agree, a part II was dodgy for me, but the rest of it was totally fine.

 

[jess6]

i used the stainless steel electrode for the electroplatting question

 

[xFusion]

LOL omg wtf was I thinking. I didnt even know what silver plating meant and I wrote some shit about dipping the spoon into the solution and drying it:rofl:

 

[dekimasu]

Yer...

Platinum (anode) - not silver as it is in a SCHOOL laboratory
Artifact (cathode)
Silver nitrate - electrolyte

haha. platinum costs over 100 times silver per gram. what type of school do you go to? i put graphite rod.

 

[mitchwong650]

haha. platinum costs over 100 times silver per gram. what type of school do you go to? i put graphite rod.

i lol'd at that too. nice sig

and uhhh yes. i just used something that wouldnt react in place of Ag+ ions