ezzo

Hahaha.

there is band theory, intrinsic & extrinsic (n/p) semiconductors and semiconductor diodes

Yeah, you too nofing?

Actually, it is more of "took", haha.

Sorry to hear that Cloud, but I reckon it is probably your teacher?

My teacher back in Sec school did introduce my class to the spdf notation and I suspect probably only half the class got it. Hahaha. I mean it is there is no need to know about it and it might just confuse things for some people.

As about the Aufbau Principle, Pauli Exclusion Principle and Hund's Rule of Multiplicity (all being thought in A levels), judging by the syllabus of the O levels, there isn't much that can be applied with those principle, probably will be like overkill. Unlike in A levels where they are used in chemical periodicity.

HMMM. I happen to take the new A levels Physic and IMO, the topic on semi-conductors is pretty lame, seriously. There is only a few pages of notes on it and they do not related much to other topics (just like Nuclear Physics, Quantum Theory, etc etc...). I do not see a need to learn that in A levels.

My all time heart breaker would be:

Unintended by Muse

You can just imagine yourself singing the song, when you and your loved one have parted....TOUCH WOOD!

The vocals by Matt is so smooth and tragic..the lyrics.. Whooo..

Listen to it HERE!

yup. and i remembered seeing something like 2:8:18:2:6 in one of the text books back in secondary. then i asked my teacher why is it 18. she told me this u dun need to know. just know 2:8:8:2. i just went, orh. my mind says (u win liao).

Hahaha. Yeah, that is sufficient for O Levels actually, since we only need to know the 1st 20 elements, which will be up to a Electronic Configuration of 2, 8, 8, 2.

The actual filling up of energy levels are by:

1s

2s 2p

3s 3p 3d

4s 4p 4d 4f

5s 5p 5d 5f

6s 6p 6d 6f

.

..

>with imaginary diagonal lines from the top right corner downwards of order of filling up (Sorry, cant draw out the lines) here.

So, the order will be 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p ...

where the number stands for the shell number and s/p/d/f are the orbital types. A s orbital can hold 2 electrons, p - 6 electrons, d - 10 electrons, f - 14 electrons.

For example, Ca with 20 electrons will have a EC of 1s(2), 2s(2), 2p(6), 3s(2), 3p(6), 4s(2), thus 2, 8, 8, 2.

While Sc, with 21 electrons will have a EC of 1s(2), 2s(2), 2p(6), 3s(2), 3p(6), 4s(2), 3p(1), thus 2, 8, 9, 2.

Okay, this is getting a little off..haha. Just for your info!

Lingerie

Cloud: I see, no wonder you seem pretty pro in Chemistry

As for Oxidation,

Gain in Oxygen as oxidation is due to the fact that oxygen is very electronegative and it basically oxidises everything it reacts with.

It is the opposite for Hydrogen, with a oxidation number of +1 (other than metal hydrides).

For reduction, it is just the other way round.

So it is "kind of" correct but not proper. I learned this in Secondary school and I think they should scrap it man. Haha. It is not in the A levels chemistry, it is just loss/gain of electrons.

Btw, I have seen silk and cotton used as insulation. Anyone have experience with them?

Yeah, I realised its not the "proper" way of calculating oxidation/reduction. Oh wells, secondary school stuff, my apologies.

Mistake.

SCl4(l) + 2H2O(l) --> SO2(g) + 4HCl(g)

SCl4 --> SO2

Gains 2 O, Oxidised

H20 --> HCl

Loses 1 O and loses 1 H, therefore, no oxidation/reduction.

Btw, I don't specialise in Redox equations nor Chemistry, these are just my secondary school Chemistry.

Man, its late, gonna sleep. Nights dude.

Yep, it is a half reaction.

Another one here:

HCl + NaOH -> NaCl + H20

Haha. How about the one you just mentioned?

Na -> Na+ + e-

Or HCl + H20 -> H3O + Cl- ?

Well, not in all reactions.

"the actual transfer of electrons may never occur" is for a redox reaction. A redox reaction is when oxidation and reduction occurs in the same reaction.

Fool

I get what you mean Heady, but sometimes you cant help it when other people are pretty hostile too yeah?

As for the sulphuric compounds, their reactivity is highly debatable too (whether they will actually react with silver or not). That I have no idea.

Well, changes to oxidation state only occurs when elements are bonded with others to form compounds and that varies for an element bonded to this group or another group.

The oxidation state of an element is usually not represented by the charge on the atom, so I don't think milkpowder is correct.

Welcome.

The noise isolation is another issue here too..

Since when did you take on the role of forum censor? Can I not share knowledge which I have learned from others? Is this not what a forum is for? Anyhow, I'm not sure why you have to speak with such a sarcastic tone.

Did I say I have taken the role of the forum censor? Did I say you cannot share your knowledge with others?

No, I did not.

Moving on to more relevant matters:

Note that I put inert air in quotation marks. Of course I know there is no such thing as inert air. It's part of Nordost's BS marketing literature. I am well aware that even some of the most inert elements (eg gold) can be made into compounds under the right conditions.

About silver oxidising in contact with air, I think it is your own scientific knowledge that has let you down, "dude". If you were so keen on scientific terminology, I'm surprised you didn't pick this one out. Please hear me out. Oxidation can mean an increase in oxidation state so your rash statement about the word "oxidation" hinting at what caused it is partially incorrect. Technically, silver doesn't form oxides in normal atmospheric conditions. What it does form, however, is silver sulfide, Ag2S

 

The reaction can be summarised as such:

2 Ag + H2S => Ag2S + H2

 

The oxidation number of silver on the left hand side is 0 as it is in elemental form. After reacting with H2S in the air, its oxidation number is now +1. An increase in oxidation number equals an oxidation reaction. Technically, this is a red(uction)ox(idation) reaction because hydrogen goes from being in +1 oxidative state to 0. Sulfur's oxidation state remains constant at -2.

 

I hope that justifies what I've said. Peace.

Inert air, you can say it is marketing (literature??), think about it and you will see it is more of their incompetence in basic chemistry.

Btw, it was not my rash statement that made me say "oxidation" to hint you, it was merely to hint to you if you don't get it. Oxidation = related to oxygen??? Lol. There isn't anything scientific to it, don't write into it so much.

About oxidation, it is not a gain in oxidation state. Oxidation states do not change.

Oxidation is the loss of electrons in simple.

If you want to talk about tarnishing of silver by sulphur, there is no significant sources of sulphur in the environment we live in (unless you are a miner or what so ever), and don't even talk about it around silver cables. The main issue here is really oxidation.

p.s. Using the word Peace does not justify your personal attacks like,"I think it is your own scientific knowledge that has let you down, "dude" " - its lame.

Chill yeah? There isn't much about what I say that you have to read so much into it

Well, I have heard the D2000 briefly.

Starters, the bass extension is awesome, way better than a DT990/DT880 2005ed, both which I heard after the D2000. The soundstage is great for a closed headphone but you will still get the feeling it is a Closed headphone, significantly different from Open headphones.

Bass: There is really loww bass, unlike Grados where there is basically only mid-bass, IMO though.

As for the others, it was too noisy and short for me to listen critically, but the bass that gave me the "wow" factor. I listened to the DT880/DT990 (for the first time) after the D2000 and I was not impressed at all, maybe it is just me, correctly me if you don't agree with me

Btw, I think this thread is in the wrong section, I don't see how you might want to bring a D2000 out. Haha.

I will be receiving the D2000 very soon, you guys can hold on or head to Head-fi, there is this longg thread on the D2000.

p.s. Head-fi is still down at the time of this post

yeah talk about it. mac platforms cant run flac for nuts. at least to a noob like me.

Yeah, there are many free media players/codec packs out there that will allow Flac to be played on your mac.

Just do a search

Like you said, it is impossible to keep the silver wire suspended in the middle of the insulator on its own. However, with the help of an additional spiral of filament around the conductor, this is definitely possible. Just look at Nordost's higher-end cables. They all boast mono-filament or dual-mono-filament technology, most recently patented and developed by 3M in 2005 (US patent no 6,849,799). The helically wound spacer (or filament) creates air voids, suspending the central conductor in air - the best dielectric 2nd only to a vacuum - and effectively lowering the dielectric constant of the cable. As a result, propagation speed increases.

 

This technology has actually existed since April 1936 (US patent no 2,038,973) invented by Jesse F Wentz of Bell Telephone Laboratories. Wentz used a dual filament of acetylated cotton around a copper conductor, which was then wrapped in iron tape and encased in a lead sheath.

Erm, thanks for telling everyone that?

I was referring to the Slinkylinks cable know... It was not stated on their website about how they do it, or perhaps I missed it, either way, it does not matter now.

It's sulfur in atmospheric air that causes the 'oxidation' or 'tarnishing' of silver. During the manufacture of a cable, I'm sure it is possible (don't quote me on this ) to purify the air in a way that all the potentially reactive components are removed, hence leaving you with "inert air".

Please, don't quote the "inert air" from Aron yeah?

There is no such a thing as inert air for God's sake.

Air is made up of many different kinds of gases. There are gases called inert gases and none of them exist in the "Air" in significant amounts.

Frankly, using such a term as "Air" or "Inert Air" just shows you how good they are. Maybe they are writing for "everyone" to read but "Inert Air" IS a joke.

As for the sulfur in the air, I have no idea.

I thought the word "oxidation" itself would give you a hint of what caused it, its oxygen dude.

Yeah, small matter.

Since nofing have removed his posts, I have done the same to my replies (to him).

Edit: I have removed the rest of the post. Let bygones be bygones.

removed

removed

Removed

Ha ha. We are so OT.

 

I happen to have a degree in a scientific profession, so I do know my metals cos we need to study their characteristics in our work. So, do lighten up, don't take it so seriously.

 

Re: the slinkylinks. If you read the info on the website, it will tell you that at regular intervals the silver wire is supported by the insulator which is probably made like the inside of bamboo. So their claim is considering the overall length of wire. I for one don't believe in their marketing. But it makes really good reading, just for laughs.

Haha. Okay la.

Heady, I am guessing you are a dentist, but anyway I wasn't aiming at you so yeah.

I was aiming the other person, all of what I wrote was "for his knowledge" anyway.

Ah, okay, I was asking that for that.

Yeah, using the term "air" probably just shows how good they are

BTW, Aron, I left it out, "Lol" stands for Laugh Out Loud, not laughing out loud...

LMAO

I hope you understand we are here posting to help and not proving we're smarter by picking gammer or being critical like Jenhwa mentioned. Some things here have to be taking in with your common sense if not you would have to start typing "laughing out loud" instead of "lol".

 

So tell me, when you commented that "oxidation affects all metals", should I say, "I never knew oxidation affects ALL metals, LOL, haven't you heard of stainless steel?"

It was just a simple remark, don't take it too hard

Wow, another one. You should read more about stainless steel too dude, right HERE.

I am just correcting you here, take it or leave it man.

Well, I still have no idea how slinkylinks does it.

I am more of a scientific person, not just the sound quality. As for sound quality, sometimes it is hard to tell if it is REALLY better or it is a placebo.

I can say what Slinkylinks claim to do is impossible! (without the silver wire touching the tube here and there and here and....)

I am 100% sure that gold is a metal and it is not affected by oxidation. Now stainless steel.....I am not so sure. I use a lot of stainless steel instruments in my previous profession and after some time, they can undergo some oxidation (rust lah.. )

Stainless steel has different types in the industry, regular stainless steel with nickel added to iron is resistant to oxidation under certain condition and temperature whereas stainless steel with carbon added to iron is stronger and extremely resistant to oxidation. Most cases where the steel is not scratched or cracked they should be ok I guess. Read this from the internet.

 

Sorry for going off track.

 

Well, rust is actually term for iron oxide.

For the rest of the metal, it is oxidation. The fact is that gold oxidises, just SUPER slowly due to its structure, to gold oxide.

As for stainless steel, lets not talk about it, most people will know it does oxidise. Or should I get more scientific... Haha. no more