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Siken

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241

Sunday, June 7th 2009, 10:21pm

Hmm...Lehrerin meinte lediglich das wir die Reaktionsgleichung aufstellen sollen.
Also gleichen sich die beiden sozusagen aus:
K2SO4 +Wasser ---> 2K+(aq) + SO42-(aq)

Auf sowas wäre ich nie gekommen.
Ich weiß gar nicht woher man diese Informationen nehmen sol =/
Siken bezeichnet Userin als "Hure".

grilled

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242

Sunday, June 7th 2009, 10:23pm

Quoted

Original von Siken
Hmm...Lehrerin meinte lediglich das wir die Reaktionsgleichung aufstellen sollen.
Also gleichen sich die beiden sozusagen aus:
K2SO4 +Wasser ---> 2K+(aq) + SO42-(aq)


so ist es

walker

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243

Sunday, June 7th 2009, 10:23pm

Hallo Siken,
also so wie du das da aufgeschrieben hast, sieht das für mich nach der Rückreaktion von

2KOH + H2SO4 ----> K2SO4 + 2H2O
aus (also einfach die von mir geschriebene Reaktion "rückwärts" lesen)

aber damit hättest du eine Starke Säure und eine recht starke Base in einer wässrigen Lösung zusammen, was ziemlich ungünstig wäre.

was genauso gut gemeint sein könnte, wäre die hydratation (quasi das lösen in wasser) von dem feststoff K2SO4 nach folgender gleichung:

H2O + 2-
K2SO4 ------> 2K (aq.) + SO4 (aq.)

Hasta Luego
Hannes


EDIT: naja war ich wohl deutlich zu langsam;)

This post has been edited 1 times, last edit by "walker" (Jun 7th 2009, 10:24pm)


Siken

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244

Sunday, June 7th 2009, 10:26pm

Hydratation war gemeint ;)
Danke euch beiden.

Wobei ich immer noch nicht versteh warum es so ist...
Siken bezeichnet Userin als "Hure".

grilled

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245

Sunday, June 7th 2009, 10:40pm

Wenn man von einer starken Säure oder Base spricht, so bedeutet das eigentlich nur, dass der Stoff zu fast 100% dissoziiert ist. Beispiel Kaliumhydroxid und Schwefelsäure:
KOH + H2O --> K+ + OH-
H2SO4 + H2O --> 2H+ + SO42-

Jetzt passieren beide Reaktionen aber direkt nebeneinander, was bedeutet, dass sich die Protonen und die Hydroxidionen sofortz zu Wasser neutalisieren... übrig bleiben also nur K+ und SO42-.

Deshalb reagieren die stoffe eben nicht wie folgt:
K2SO4 + 2H2O --> 2KOH + H2SO4

da die Produkte sich anschließend noch neutralisieren:
2KOH + H2SO4 --> 2K+ + SO42- + 2H2O

man vereinfacht also:
K2SO4 + 2H2O ---> 2K+(aq) + SO42-(aq) +2H2O
(das wasser kannst du auf beiden Seiten rauskürzen, und über den Reaktionspfeil schreiben).

Seeed

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246

Monday, June 15th 2009, 4:42pm

Hat zufällig jemand was spanisches über Bolivische Bodenschätze oder kann mir jemand was übersetzen? :schäm:
Mein Homer ist kein Kommunist. Er ist vielleicht ein Lügner, Schwein, Idiot oder ein Kommunist, aber er ist sicherlich kein Pornostar.

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auntey

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247

Monday, June 15th 2009, 10:15pm

jop kann ich machen wenn du mir den text schickst... ist sowieso ne gute übung wir haben nächste woche klausur...

p.s.: spanisch kann ich ganz gut, bin bester im LK ;)
„Wer kämpft, kann verlieren. Wer nicht kämpft, hat schon verloren.“

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248

Monday, June 15th 2009, 10:16pm

wie geht nochmal kovareanz bzw korrelation!
ich kapier es nichtmehr.
wikipedia hilft nicht weiter

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Mit Shisha aufgehört. Trotzdem noch Aktiv in der Com. Problem damit? :D

Seeed

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249

Monday, June 15th 2009, 11:32pm

Quoted

Original von auntey
jop kann ich machen wenn du mir den text schickst... ist sowieso ne gute übung wir haben nächste woche klausur...

p.s.: spanisch kann ich ganz gut, bin bester im LK ;)

hat sich schon erledigt, trotzdem danke :kiss:
Mein Homer ist kein Kommunist. Er ist vielleicht ein Lügner, Schwein, Idiot oder ein Kommunist, aber er ist sicherlich kein Pornostar.

Grandpa Simpson

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250

Monday, June 15th 2009, 11:45pm

Quoted

Original von KiLLaH S04
wie geht nochmal kovareanz bzw korrelation!
ich kapier es nichtmehr.
wikipedia hilft nicht weiter


kovareanzformel ist ganz einfach: s= 1/n mal (summe aus i=1 bis n) (x, - x*)x(y, - y*)
x* ist das arithmetische mittel vom merkmal x

die kovareanz brauchst du um die korrelation auszurechnen:

r= s(also die kovareanz) /
Wurzel aus dem produkt von der summe (x, - x*)² x summe (y, - y*)²


mit diesen formeln kannst du alles ganz einfach berechnen
.... Drittens und jetzt kommen wir zur absoluten Hauptsache. Man verdient nur dann Respekt als Arzt, nein, Respekt als Mensch wenn man eine Insel ist. Man wird allein geboren und man stirbt auch verdammt allein. Der Punkt ist und das solltest du dir vielleicht Notieren. Hilfe brauchen nur die Schwachen." Perry Cox

Gaz

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  • "Gaz" has been banned

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251

Tuesday, June 16th 2009, 9:47pm

Wurde bei euch auch nach der 6 Stunde zwangsweise eine Pause eingeführt?
bei uns ist das so, das heisst dass die 8 stunde um viertel vor 4 endet.


Hookah - Connecting People

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252

Tuesday, June 16th 2009, 10:05pm

Quoted

Original von Diplomat

Quoted

Original von KiLLaH S04
wie geht nochmal kovareanz bzw korrelation!
ich kapier es nichtmehr.
wikipedia hilft nicht weiter


kovareanzformel ist ganz einfach: s= 1/n mal (summe aus i=1 bis n) (x, - x*)x(y, - y*)
x* ist das arithmetische mittel vom merkmal x

die kovareanz brauchst du um die korrelation auszurechnen:

r= s(also die kovareanz) /
Wurzel aus dem produkt von der summe (x, - x*)² x summe (y, - y*)²


mit diesen formeln kannst du alles ganz einfach berechnen


hätt ich gestern nochmal reingeguckt.
total vergessen :D
naja hab ja trotzdem bestanden, auch wenn es mit der schlecht möglichsten note war.
trotzdem danke!

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FunGun

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253

Tuesday, June 16th 2009, 10:50pm

@Gaz, ja es war bei mir immer so, allerdings war ich teilweise erst um 4 durch, da die 6te bis Punkt 2 ging. Danach ne halbe Stunde Pause oder so... ekelig sowas.

Rattig

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254

Wednesday, June 17th 2009, 10:50am

Quoted

Original von Gaz
Wurde bei euch auch nach der 6 Stunde zwangsweise eine Pause eingeführt?
bei uns ist das so, das heisst dass die 8 stunde um viertel vor 4 endet.


Jo, ist glaube ich so vereinbart, damit die Lehrer und Schüler ín Ruhe essen können etc.
Bei uns wurde die Regelung vereinbart, dass man nur eine halbe Stunde Pause macht (sonst eine ganze Stunde).
"I found freedom. Loosing all hope was freedom!" - Jack (Fight Club)

Kret

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255

Wednesday, June 17th 2009, 3:40pm

Huhu,

Muss morgen ein kleines Referat halten in Bio.

Wollte fragen ob jemand infos zu meinem Thema hat:

Verdopplung der DNA in der Interphase!

Danke schonmal.

Mfg, Kret
Erstaunlich wie verwirrt Menschen plötzlich sind, wenn ein Satz anders endet als man es Kartoffel.



VietPride

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256

Wednesday, June 17th 2009, 7:22pm

Bisschen spät, aber bei Wikipedia steht doch der Ablauf in der Interphase:
http://de.wikipedia.org/wiki/Interphase

Ich finde diese Animation hier total gut:
http://www.wiley.com/college/pratt/04713…tion/index.html

Ist aber leider auf Englisch =)

Falls du Fragen zur DNA-Replikation hast, frag einfach =P




Achja falls jemand Probleme in Mathe hat.
Es gibt da so ne Seite im Netz, die verschiedene Mathethemen behandelt.
Ist total gut erklärt und macht Spaß dem Typ beim Erklären zuzuhören.
Mathe wird da in Videos leicht und verständlich erklärt.

www.oberprima.com

This post has been edited 2 times, last edit by "VietPride" (Jun 17th 2009, 7:23pm)


Kret

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257

Wednesday, June 17th 2009, 8:33pm

Quoted

Original von VietPride
Bisschen spät, aber bei Wikipedia steht doch der Ablauf in der Interphase:
http://de.wikipedia.org/wiki/Interphase

Ich finde diese Animation hier total gut:
http://www.wiley.com/college/pratt/04713…tion/index.html

Ist aber leider auf Englisch =)

Falls du Fragen zur DNA-Replikation hast, frag einfach =P




Achja falls jemand Probleme in Mathe hat.
Es gibt da so ne Seite im Netz, die verschiedene Mathethemen behandelt.
Ist total gut erklärt und macht Spaß dem Typ beim Erklären zuzuhören.
Mathe wird da in Videos leicht und verständlich erklärt.

www.oberprima.com


Das Prob ist halt, dass ich keine Details zur Interphase brauche sondern zur Verdopplung der Dna!

Ich kann beim Referat nicht ankommen und sagen, joa das geschieht in der Synthese Phase, der Interphase ^^
Erstaunlich wie verwirrt Menschen plötzlich sind, wenn ein Satz anders endet als man es Kartoffel.



VietPride

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258

Wednesday, June 17th 2009, 8:41pm

Dann musst du unter "DNA-Replikation" nachschauen.
http://de.wikipedia.org/wiki/Replikation

Außerdem:
http://www.u-helmich.de/bio/gen/reihe2/22/karte223-s.html

auntey

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259

Thursday, June 18th 2009, 8:20am

kann mir jemand vielleicht bei dieser gleichung helfen? ist für einen freund, aber ich komme auch nicht weiter ;)

danke :tu:
„Wer kämpft, kann verlieren. Wer nicht kämpft, hat schon verloren.“

Bertolt Brecht

This post has been edited 1 times, last edit by "auntey" (Jun 18th 2009, 8:20am)


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260

Thursday, June 18th 2009, 11:17am

Ja, und was ist mit der? Soll man ein x finden, dass es stimmt oder wie? Das wäre dann x = 1 :D

This post has been edited 1 times, last edit by "KetchupBrötchen" (Jun 18th 2009, 11:17am)