kin 發問於 科學及數學化學 · 1 十年 前

[AL chem]點解form bond 會放energy?

點解form bond 會放energy?

break bond 要energy就好清楚姐,因為要overcome 個attraction,

但form bond呢?

仲有O(g)+e- ---->O-(g)

點解又會放energy呢?

吸新黎o既electron o既attraction force大過repulsion force 咁又點???

咁net energy 唔係用左黎令electron移向吸佢埋去o既atom 咩?

咁點會release?

唔該各位chem高手指導一下!!!thx!!!!

更新:

re violinist:

如果真係咁,咁點解會熱左(exothermic)?

更新 2:

似唔似人造衛星咁要release o的energy 轉向,入orbital ?

更新 3:

咁form bond 呢?

1 個解答

評分
  • 1 十年 前
    最佳解答

    咁net energy 唔係用左黎令electron移向吸佢埋去o既atom 咩?

    totally correct.

    話release energy, 應該係release potential energy

    而呢啲released左既energy就變左 拉粒electron埋去atom 既work done (or kinetic energy)

    energy 唔會release左就唔見左既,一定係transform其他形式,好似今次就係PE轉KE,

    net POTENTIAL energy係負數, 因為一部分變左electron 既KE

    但係net TOTAL energy( PE + KE)一定係零

    呢個就係CONSERVATION OF (total) ENERGY

    其實你自己已經up左個答案, 明左個concept, 不過比啲TERM fake左姐~

    2008-11-24 11:38:26 補充:

    exothermic process係泛指由 一個system 既PE, 有部分變左work(of electron transfer), w, 之餘

    同時亦有部分變左heat (transfer of energy), Q, 去左surrounding (例如container, neighbouring molecules, air molecules,

    heat 就以thermal energy 既形式 exist. 令surrounding temperature increase.

    其實呢個即係physics既 first law of thermodynamics

    2008-11-24 11:41:51 補充:

    係,同衛星個case一樣

    只係, O + e --> O- involve既係electrical potential energy

    衛星involve 既係gravitational potential energy

    2008-11-25 03:42:02 補充:

    formation of bonding 如果係由一啲reactive 既species

    link埋一齊form 一個more stable既species (contains lower potential energy),

    咁就係exothermic process囉~

    e.g. Br radical + Br radical --> Br2 molecule

    資料來源: , law of conservation of energy
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