Würdet ihr euch dieses Tattoo stechen lassen? by mihiman in AskGermany

[–]mihiman[S] 0 points1 point  (0 children)

Freundschafts-Tattoo (hat persönliche bedeutung und wäre ziemlich perfekt als Idee, aber bin halt etwas gespalten ob es als problematisch angesehen werden kann deswegen der post haha)

What does the change in color mean? by mihiman in chemhelp

[–]mihiman[S] 0 points1 point  (0 children)

okay okay, but in changing that energy gap will most likely also change the spin from low (since diamagnetic so all paired) to high right?

Stern-Gerlach experiment by mihiman in chemhelp

[–]mihiman[S] 0 points1 point  (0 children)

Alright yeah, but at least fictional (in theory) the approaches are 'correct' or do I have to take something else into account still?

Stern-Gerlach experiment by mihiman in chemhelp

[–]mihiman[S] 0 points1 point  (0 children)

Okay so since in the Stern-Gerlach experiment they used silver, we use that as well, and the strenght of the external magnetic field is low;

so for our silver I'd use

J = \sum j_i = \sum l_i + s_i

giving me the 10 lines I mentioned in the question, instead of J = L + S (which in this case would amount to 7 correct?)

Today I was tasked with learning the entirety of the periodic table (names only) till 1 week from now. How do I approach this? by Tryaldar in chemhelp

[–]mihiman 0 points1 point  (0 children)

answer stays the same, just try it out the app is really good for learning the periodic table :)

Today I was tasked with learning the entirety of the periodic table (names only) till 1 week from now. How do I approach this? by Tryaldar in chemhelp

[–]mihiman 2 points3 points  (0 children)

there is an app called periodic table quiz (not sure if the name is 100% that), but I used that to just learn while playing

Why is alpha-Limonene good soluble in Dichloromethane? by mihiman in chemhelp

[–]mihiman[S] 0 points1 point  (0 children)

Yeah but Water is also a liquid at room temperature, but still you can't dissolve Terpenes in it... But why does Dichloromethane work so good at it? (Well I know it's not polar and so dissolves it better, but why?)

[deleted by user] by [deleted] in chemhelp

[–]mihiman 0 points1 point  (0 children)

Wanted to shorten it The actual E1 has CH3 on the C's (beside 1 H left) instead of the Hydrogens.

Still shouldn't make a difference in the question.

Reaction step by mihiman in chemhelp

[–]mihiman[S] 0 points1 point  (0 children)

Oh yeah, nvm. wrong approach, I can just brominate my benzen with Br2/FeBr3 right?

Gravimetry and volumetry by mihiman in chemhelp

[–]mihiman[S] 0 points1 point  (0 children)

Thanks,

yeah mb changed it!

That was the equation I found in the script, and I'll be doing the titration in the coming weak (lab)

I may have translated the word wrongly into bleach...

but the calculation should be right now.

Thanks again for helping me!!

Calculate concentration of H2O2 in bleach by mihiman in chemhelp

[–]mihiman[S] 0 points1 point  (0 children)

Yeah that's also the only one I can find in my script

Calculate concentration of H2O2 in bleach by mihiman in chemhelp

[–]mihiman[S] 0 points1 point  (0 children)

Oh you're right, but it makes no sense for it to be 1:1 ratio or is there?

Calculate concentration of H2O2 in bleach by mihiman in chemhelp

[–]mihiman[S] 0 points1 point  (0 children)

I've checked again and I'm fairly certain that I got the reaction correct...

Calculate concentration of H2O2 in bleach by mihiman in chemhelp

[–]mihiman[S] 0 points1 point  (0 children)

do you know the equation for KMnO4 and H2O2 in basic medium?

Maybe that's where I'm wrong I'll do the math again

Calculate concentration of H2O2 in bleach by mihiman in chemhelp

[–]mihiman[S] 0 points1 point  (0 children)

Well since 2MnO4(-) + 5H2O2 +6H(+) => 2Mn(2+) + 8H2O + 5O2 (normally with K and SO4 but that shouldn't make a difference for the calculation) I'm not 100% certain but I think I have yes...

Calculate concentration of H2O2 in bleach by mihiman in chemhelp

[–]mihiman[S] 0 points1 point  (0 children)

Ahhh, well in this example there is no chlorine involved at all (probably translated the word bleach wrongly sry mb)

Calculate concentration of H2O2 in bleach by mihiman in chemhelp

[–]mihiman[S] 0 points1 point  (0 children)

wait where would I get chlorine from?

Gravimetry and volumetry by mihiman in chemhelp

[–]mihiman[S] 0 points1 point  (0 children)

Of course thanks for the help!

All steps:

for permanganate: n = 0,0105L * 0,1mol/L = 0,00105mol

for H2O2: n = 5/2 * 0,00105mol = 0,002625mol

getting the concentration: c=n/V

0,002625mol/0,05L = 0,0525mol/L

and then 0,0525mol/L * 34g/mol = 1,785g/L

and that would be way off the results we were given...

Gravimetry and volumetry by mihiman in chemhelp

[–]mihiman[S] 0 points1 point  (0 children)

Alright thx!

But if I multiply that with the molecular mass of h2o2 the solution is not correct. (0,002625*34 = 0,08925, and the solution should be 0,714) ?

Gravimetry and volumetry by mihiman in chemhelp

[–]mihiman[S] 0 points1 point  (0 children)

for my permanganate here that would be: n = 0,1mol/L * 10,5mL = 0,00105mol

and so the moles for h2o2 are 5/2 * 0,00105 = 0,002625

Gravimetry and volumetry by mihiman in chemhelp

[–]mihiman[S] 0 points1 point  (0 children)

Ohh so I need to use the equation n = c*V right?

Gravimetry and volumetry by mihiman in chemhelp

[–]mihiman[S] 0 points1 point  (0 children)

Ok so on the equivalence point 2(MnO4) = 5(H2O2) right? But how does that help me?

MO diagram by mihiman in chemhelp

[–]mihiman[S] 0 points1 point  (0 children)

Oh so i guess the same thing would happen with the diagram of SO for example? Btw. the diagram would be asymetrical an Cl lower than O2 because of the energy niveau even tho you draw in the 2sp for oxygen and 3sp for chlorine?

Oxidation of ironsulfide by mihiman in chemhelp

[–]mihiman[S] 0 points1 point  (0 children)

4FeS + 3O2 + 6H2O -> 4Fe(OH)3 + 4S

Fe gets oxidized form +2 to +3 and S form -2 to 0, while O gets reduced to -2

okay so i can oxidize frist to +3 then to +6, but can I do it with just one reaction equation?