Persoalan yang belum selesai dalam Sains KIMIA

musang_pulut

• Solvolysis of the norbornyl cation: Why is the norbornyl cation so stable? Is it symmetrical? This problem has been largely settled for the unsubstituted norbornyl cation, but not for the substituted cation.
• What is the electronic structure of the high temperature superconductors at various points on the phase diagram? Can the transition temperature be brought up to room temperature?
• On-water reactions: Why are some organic reactions accelerated at the water-organic interface?
• Better-than perfect enzymes: Why do some enzymes exhibit faster-than-diffusion kinetics? See: Enzyme kinetics.
• Feynmaniums: What are the chemical consequences of having an element (137) whose electrons must travel faster than the speed of light? Problem actually occurs at Element 139 (eka-actinium/dvi-lanthanum), since 揂 complete analysis involving relativity reduces the speed of electrons, therefore allowing stable 1s orbits in the element 138 (Uto).擺*]Protein folding problem: Is it possible to predict the secondary, tertiary and quaternary structure of a polypeptide sequence based solely on the sequence, and environmental information? Inverse protein-folding problem: Is it possible to design a polypeptide sequence which will adopt a given structure under certain environmental conditions?
• What is the origin of homochirality in amino acids and sugars?
• Do sterics (electronic repulsion) or electronics (electronic polarization) have a greater effect on chiral induction in stereospecific and stereoselective chemical reactions?
• How can electromagnetic energy (photons) be efficiently converted to chemical energy? (E.g. splitting of water to H2 and O using solar energy.)
• What are the chemical origins of life? How did non-living chemical compounds generate self-replicating, complex life forms?
• How does the flow of elements, energy, and electrons (oxidation states) drive the structure of local and global ecosystems?
• What is the origin of the bond rotation barrier in ethane, steric hindrance or hyperconjugation?
• Can the macroscopic properties of a substance be explained by forces and energies on the atomic scale? What at the macroscopic scale can be determined by the microscopic?
• What is the nature of bonding in hypervalent molecules?

[ Last edited by  musang_pulut at 30-1-2007 11:16 AM ]

Sephiroth

Someone speak in Plain English please ...

prototaip

Takpe...aku akan tolong terangkan dalam BM sedikit demi sedikit....tunggu ye...

windmill

takder ke orang yg research topics nih?

mana tau dah ada publish kat latest journal

prototaip

1.Solvolysis merupakan sejenis tindakbalas nucleophilic substitution dalam keadaan nucleophile bertindak sebagai molekul pelarut.(Untuk mengetahui apa itu nucleophilic substitution dan nucleophile,bolehlah rujuk mana-mana buku Kimia Organik aka Organic Chemistry).

2.Yang menjadi persoalan,mengapa  norbornyl cation sangat stabil dalam tindakbalas Solvolysis?

Aku yakin student chemistry atau ahli chemistry tahu mengapa kestabilan cation ni dianggap sebagai masalah misteri dalam sains.

aku_EnSeM

musang pulut, are u n xpert in organic chemistry?

musang_pulut

Last paper org aku amik, kimia organik lanjutan 2...lama dah tu

nizamje

aku ada soalan... pasal benda ni.. bahan kimia la... potassium chlorate(kcl03) dan potassium nitrate. soalannya adalah.. kat mana aku leh dapatkan benda tu? sapa leh supply?

aku_EnSeM

mintak tolong org jabatan kimia smuggle bende tu....

nizamje

thanks.... ada sapa2 orang jabatan kimia kat sini??

aku_EnSeM

btw, ko nk wtpe ngan bende tu?

nizamje

buat experiment la bro

mbhcsf

a general one :-

like apa kegunaan tindakbals tu ? boleh bagi tak contoh in daily lives? or in specific processes?

why would that be a question of interest in the target community ( chemist ) ?


kena norbonyl compound tu menarik like in what way it 's being proven to greatly utilized ?

aku_EnSeM

nk buat exsperiment ktne? cari je kt lab2 uni... byk

nizamje

bro ensem leh tolong dapatkan?

metalcomplex

adei.....MC student kimia pun xley jwp...mc xpakar kimia pun
bg mc kimia sgt susah...

dax_wdw

Most of the problem will be much complex to understand for general science follower.
Aku sbg chemical engineer pon tak tau masalah ini. Ini org pure chemistry mesti ade skit2 pengetahuan psl unsolved problems nih.
BTW chemistry mmg best

mbhcsf

so u like chemistry ?

which part - sebba i am not major in chemistry tapi i suka physical chemistry yg calculation tu  and predicting the structure of an atom ....molecules etc ...tu yg cool....oh ya  inorganic pun nice....

dax_wdw

saya lebih ske chemical engineering thermodynamics, material and energy balance. yg ni cuma applied chemistry, bukn pure. tp penting dlm massive scale chemical production

auntie_girl

Originally posted by nizamje at 21-4-2009 23:51
aku ada soalan... pasal benda ni.. bahan kimia la... potassium chlorate(kcl03) dan potassium nitrate. soalannya adalah.. kat mana aku leh dapatkan benda tu? sapa leh supply?

dah dapat lom?

kalo tak dapat lagik, PM saya

<cuba tolong kalau mampu la kan >