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alinc:
sekedar info saja yah  ;)
nanti untuk bahasan bisa melalui topik yang akan dibuat


Unsolved problems in chemistry

Unsolved problems in chemistry tend to be questions of the kind "Can we make the X chemical compound?" and are solved rather quickly, but here are some persistent questions with deep implications:

    * 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.
    * 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.
    * Feynmanium: 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 “A complete analysis involving relativity reduces the speed of electrons, therefore allowing stable 1s orbits in the element 138 (Uto).”
    * 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?

mr.zero:

--- Kutip dari: alinc pada Januari 26, 2007, 02:43:30 AM ---
    * Feynmanium: 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 “A complete analysis involving relativity reduces the speed of electrons, therefore allowing stable 1s orbits in the element 138 (Uto).”

--- Akhir Kutipan ---
whaaa yg ini baru denger yang ini aja yg di post yah  ::)

alinc:
@mimin
hehehe tq tq .

@mr.zero
sesuai permintaan itu yang pertama bro

astronomsableng:

--- Kutip dari: alinc pada Januari 26, 2007, 02:43:30 AM ---Unsolved problems in chemistry

Unsolved problems in chemistry tend to be questions of the kind "Can we make the X chemical compound?" and are solved rather quickly, but here are some persistent questions with deep implications:

--- Akhir Kutipan ---

Bagaimana membedakan problem2 ini dengan problem2 dalam fisika nuklir/zat padat? Kayaknya kok mirip2 pertanyaan fisika ya  ???

peregrin:

--- Kutip dari: astronomsableng pada Januari 24, 2008, 06:52:12 PM ---Kayaknya kok mirip2 pertanyaan fisika ya  ???


--- Akhir Kutipan ---

lho katanya katanya Feynmann: "All theoretical chemistry is really physics; and all theoretical chemists know it." .... hehhehe  ;D

sotoy gw  ;D

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