physics chem c0nfusion

[physics]

 
i need help

physics cathode is (-) and anode is (+)
chem cathode (+)  and anode is (-)
but then in chem when electrolysis occurs cathode (-) and anode (+)

but the fact is that cathode losses electrons and anode gains electrons so we can't really state as a rule that a cathode is (+) and anode is (-) right?

this is confusing 

[Edmund]

In Chemistry, that is galvanic cells etc..., the anode is negative because it gives out electrons.

In Physics, we look at devices such as the Vacuum tube, and this is where the cathode gives out electrons. Therefore in Physics, the cathode is negative.

chem cathode (+)  and anode is (-)
but then in chem when electrolysis occurs cathode (-) and anode (+)

but the fact is that cathode losses electrons and anode gains electrons so we can't really state as a rule that a cathode is (+) and anode is (-) right?

this is confusing 

There is a difference between galvanic and electrolytic cells. I have explained them in this post. Let me know for any clarifications

[vexx]

yeah the anode is negative because it's where oxidation occurs and it has electron loss, therefore a negative charge...(as edmund said)

[stonecold]

just a random question, is electrolysis harder or much different to galvanic cells, besides the reversal of charges on the cathode/anode?

[natty]

i didn't find it any harder or easier, it just involves different concepts. I enjoyed electrolysis more than galvanic cells though, it was more interesting

[stonecold]

^ thanks natty.  i'm still miles away from that anyway haha.

and yeah, galvanic cells are rather boring...

[vexx]

^ thanks natty.  i'm still miles away from that anyway haha.

and yeah, galvanic cells are rather boring...

i flicked through the A+ study notes for galvanic cells before my chem unit 2 exam, and like its exactly the same in unit 4 as unit 2, do we even learn anything new o_O?

[stonecold]

I don't get why chem is so jam packed with stuff.  AoS 1 Unit 3 is virtually a repeat of Unit 2 plus Chromatography/Spectroscopy/Mass Spectrometry.  I'd rather be spending more time on the new stuff than revising mole. 

[vexx]

I don't get why chem is so jam packed with stuff.  AoS 1 Unit 3 is virtually a repeat of Unit 2 plus Chromatography/Spectroscopy/Mass Spectrometry.  I'd rather be spending more time on the new stuff than revising mole. 

yeah same:( we spent like this entire weeek on chapter 2, i'd much prefer to be spending more time on the actual more difficult concepts (spec/chromo) then revising...

luckily i have muep chem to look forward to learning new more exciting things

[kyzoo]

My Physics teacher (vice chief assessor) told us that we are doing Newton's laws for the first 2 weeks, because even though in response to being asked "Do you know Newton's Laws?" students will answer "We did them last year," many students still screw up on Newton's Laws questions in the exam - meaning they didn't learn them properly.

[Mao]

My Physics teacher (vice chief assessor) told us that we are doing Newton's laws for the first 2 weeks, because even though in response to being asked "Do you know Newton's Laws?" students will answer "We did them last year," many students still screw up on Newton's Laws questions in the exam - meaning they didn't learn them properly.

Many students fall into the trap of thinking they know what's going on, when in fact, they don't really understand it. I dare say, I can see evidence of that in this thread, and I must admit I fall down the same rabbit hole on a regular basis.

Until you know everything there is to know about a particular thing, you are not wasting your time redoing it. Your perspective will be completely different the second time you learn something, and you start realising new intrinsic properties you never would have thought of.

[physics]

thannnnnnnks everybody! :3 i undertsand