Chemistry project, help!

2006-11-13 19:23:06

#1

CommieChipmunk: Member; +488|6996|Portland, OR, USA

this is really going out on a limb but i cant find it anywhere else.

How the hell does chrysoberyl (BeAl2O4) form? like its molecular structure? I've tried everything i can think of and can't get it to work. It's a Rhombic bipyramidal shape though...

Help! I'll +1 you forever lol

2006-11-13 19:24:02

#2

cablecopulate: Member; +449|7164|Massachusetts.

When I had chemistry, the teacher was this short little fat lady. A short-round, if you will. She walked in front of me and tripped on my foot and fell. True story.

2006-11-13 19:24:54

#3

Locoloki: I got Mug 222 at Gritty's!!!!; +216|7066|Your moms bedroom

read your chemistry book... noob

2006-11-13 19:25:54

#4

Locoloki: I got Mug 222 at Gritty's!!!!; +216|7066|Your moms bedroom

ask jeeves

2006-11-13 19:26:54

#5

Locoloki: I got Mug 222 at Gritty's!!!!; +216|7066|Your moms bedroom

http://www.kasamba.com/landingpages/stu … Hgodcwb7KQ

2006-11-13 19:26:56

#6

CommieChipmunk: Member; +488|6996|Portland, OR, USA

i've been reading it. i just can't get the electrons right... it like.. doesnt work. This is AP chem btw, so any of you in college chem........

2006-11-13 19:28:09

#7

Locoloki: I got Mug 222 at Gritty's!!!!; +216|7066|Your moms bedroom

http://www.mt-berlin.com/frames_cryst/d … s/alex.htm

2006-11-13 19:31:53

#8

CommieChipmunk: Member; +488|6996|Portland, OR, USA

I've seen that, i'm looking for the molecular shape, like what it actually looks like, how its bonded, etc

2006-11-13 19:34:27

#9

l41e: Member; +677|7075

Apparently it looks like this.

https://www.ill.fr/dif/3D-crystals/images/icons/chrysoberyl-s.gif

Edit: Source.

Last edited by k30dxedle (2006-11-13 19:34:48)

2006-11-13 19:35:20

#10

CommieChipmunk: Member; +488|6996|Portland, OR, USA

yeah i know, i've seen that too, that helps me very little.. thanks for the effort though

2006-11-13 19:35:54

#11

Locoloki: I got Mug 222 at Gritty's!!!!; +216|7066|Your moms bedroom

ehhh covalent bond???

2006-11-13 19:36:33

#12

l41e: Member; +677|7075

When's your project due? Maybe I can find out some more stuff.

2006-11-13 19:37:53

#13

CommieChipmunk: Member; +488|6996|Portland, OR, USA

the Beryllium to Aluminum bond is as covalent as it gets, but either to the oxygen is very ionic.

it's due Wednesday.

Last edited by CommieChipmunk (2006-11-13 19:38:12)

2006-11-13 19:39:03

#14

Locoloki: I got Mug 222 at Gritty's!!!!; +216|7066|Your moms bedroom

Beryl (beryllium Aluminium Silicate) is a mineral, which occurs mainly in greisens, pegmatite and hydrothermal deposits. Chemically the mineral can be expressed as Be3Al2(SiO3)6. It crystallizes in the hexagonal system. Cat ion replacements give rise to various colours and hence varieties or types of the mineral. Most common varieties of beryl in Zimbabwe are: the industrial or common variety which is non transparent and may be green, white, blue or brownish and the gemstones varieties -: emerald (green), aquamarine (blue), heliodor (golden yellow) and goshenite (colourless). Coloured beryl exhibit weak to distinct dichroism. The gemstones varieties are used for adornment in jewellery settings.

2006-11-13 19:42:32

#15

CommieChipmunk: Member; +488|6996|Portland, OR, USA

thats beryl dude, thats called "beryllium aluminum silicate" I'm looking for chrysoberyl aka alexandrite. Chrysoberyl and it is beryllium aluminum oxide. Alexandrite is really a variant where 1 % of the aluminum ions are replaced by chromium...

2006-11-13 19:54:43

#16

Pizdets_Velikiy: Member; +8|6829

I'm thinking something like this (hope it comes out):

Al---Al
\ /
O
|
O--Be--O
|
O

Keep in mind that it will form a crystal lattice, so my understanding is that you won't end up having naked electrons.

2006-11-13 20:04:37

#17

Pizdets_Velikiy: Member; +8|6829

Pizdets_Velikiy wrote:
I'm thinking something like this (hope it comes out):

Al---Al
\ /
O
|
O--Be--O
|
O

Keep in mind that it will form a crystal lattice, so my understanding is that you won't end up having naked electrons.

Oh hmm disregard that, because I just realized that beryllium is bivalent, so a single unit looking like that is probably not reasonable. I for some reason thought OH IT'S LIKE PHOSPHATE and stuck four oxygens on it. Don't ask why.

How about this:

O--Al--Be--Al--O
| |
O O

Seems to work for valences, though some dipole moments will be questionable. May work out with lattice formation.

2006-11-13 20:07:02

#18

CommieChipmunk: Member; +488|6996|Portland, OR, USA

Pizdets_Velikiy wrote:
Pizdets_Velikiy wrote:
I'm thinking something like this (hope it comes out):

Al---Al
\ /
O
|
O--Be--O
|
O

Keep in mind that it will form a crystal lattice, so my understanding is that you won't end up having naked electrons.
Oh hmm disregard that, because I just realized that beryllium is bivalent, so a single unit looking like that is probably not reasonable. I for some reason thought OH IT'S LIKE PHOSPHATE and stuck four oxygens on it. Don't ask why.

How about this:

O--Al--Be--Al--O
| |
O O

Seems to work for valences, though some dipole moments will be questionable. May work out with lattice formation.

wait, how do the Als make double bonds to Be O and O and they only have 3 electrons?

2006-11-13 20:14:46

#19

Pizdets_Velikiy: Member; +8|6829

I have no text book next to me at the moment, and it's been a while since I touched chemistry that isn't organic chemistry, but as far as I remember aluminum has a valence of 3, which means it can bond to three other atoms. It does have 3 electrons in the valence shell, but it will share each one with another one from another atom, forming a covalent bond.

In other words, 2 electrons = covalent bond, but only one of the pair comes from the aluminum. So in my structure, it will yoink two from the oxygens and one from the beryllium. The first structure was wrong because beryllium only has 2, so it could not form three bonds.

This one is of course hypothetical, I can't vouch for it, but it seems SORT of reasonable....

2006-11-13 20:15:30

#20

[TUF]Whiskey_Oktober: mmmm...Toasty!; +91|7148|Oregon

they are not dbl bonds...just no way to make a line like that without the double hyphens. i too am in AP chem this year, and i tried it: 32 val e-, that lewis structure is correct...throw lone-pairs where there is not a bond, and boom, 32 e-.

2006-11-13 20:19:32

#21

Pizdets_Velikiy: Member; +8|6829

Thank you I forgot to mention that they're not double bonds... ---- stood for a single bond. Are you saying my second one was correct? Because I'm pretty sure the first one isn't.

2006-11-13 20:20:44

#22

CommieChipmunk: Member; +488|6996|Portland, OR, USA

there are only 30 valence electrons, but there are no double bonds? Does it not follow the octet rule or am i not thinking right?

If the oxygen and Al only make a single bond, then there is an unpaired electron on the oxygen? what does that do?

Last edited by CommieChipmunk (2006-11-13 20:21:46)

2006-11-13 20:21:40

#23

[TUF]Whiskey_Oktober: mmmm...Toasty!; +91|7148|Oregon

yes, the second one is right....with the 2 Al's bonded to the Be.

2006-11-13 20:23:29

#24

[TUF]Whiskey_Oktober: mmmm...Toasty!; +91|7148|Oregon

32 val e-....

Al ...2x3= 6

Be ...1x2= 2

O ...4x6= 24

Total: 32 val e-

2006-11-13 20:24:20

#25

CommieChipmunk: Member; +488|6996|Portland, OR, USA

whoa bad math, my bad... shit

BF2S Forums Chemistry project, help!

Pizdets_Velikiy wrote:

Pizdets_Velikiy wrote:

Pizdets_Velikiy wrote:

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