英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字，中文词皆可：

安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • reaction mechanism - Ozone formation - Chemistry Stack Exchange
    I have read about the formation of natural atmospheric ozone on Wikipedia, where it is claiming that the ozone creation step requires an extra molecule in order to conserve momentum and energy: $$\\
  • Work done in Irreversible Isothermal Expansion
    For instance, from Castellan 3rd Edition: "In the isothermal cycle described above, the net work produced in the irreversible cycle was negative, that is, net work was destroyed This is a fundamental characteristic of every irreversible and therefore every real isothermal cyclic transformation If any system is kept at a constant temperature and subjected to a cyclic transformation by
  • Why do most explosives have symmetrical chemical structures?
    Before discussing symmetrical nature of explosives, we might ask, "Why do they contain so many nitro groups?" The answer is in estimation of energetic properties that relies on the empirically derived Kamlet and Jacobs equations 1 In these equations the heat released by the decomposition, the number of moles of gas produced, and the molecular weight of these gases are all critical factors
  • HOMO and LUMO Conjugated System - Chemistry Stack Exchange
    The particle on a ring is a useful model for the motion of electrons around the porphine ring, the conjugated macrocycle that forms the structural basis of the heme group and the chlorophylls We may
  • experimental chemistry - Unexpected results when mixing highly . . .
    In lab students mix about 5 0 g CuCl2 with 40ml water, then add 0 5g of aluminum foil- producing copper and aluminum chloride This produces the expected result However one group used 17g of CuCl
  • electrochemistry - Orientation of external cell when voltage is . . .
    The figures in the OP's post are nicely drawn, as expected in a modern textbook, but figure 3 2 (c) has the external battery reversed, which is incorrect Here is how it works, without the needless complication of the potentiometer First, start with a standard Daniell cell with standard assumptions, i e , negligible internal resistance, unimolar concentrations, and so on Then the open
  • inorganic chemistry - Why is Cu (II) more stable than Cu (I . . .
    I suppose so I meant to ask why the +2 oxidation state for Copper is more common than its +1 I realise there is another question on the same topic, but i didn't understand their answer Yours, I do Is the greater tendency of hydration the only reason for greater stability of Cu+2 compounds? Or is there some rearrangement of energy at the electronic level?
  • electrochemistry - Electrolysis of copper sulphate using copper . . .
    In short, the aim of my experiment is to determine how the concentration of sulphuric acid in solution affects the mass liberated and deposited at copper electrodes, when copper sulphate is electro
  • Does the SDF format have any benefit over SMILES?
    The eMolecules page for example offers a complete dataset containing ~26 million structures They're providing it either as a 300 MB SMILES archive or 6 GB SDF archive (1 5 GB and 50 GB uncompressed





中文字典-英文字典  2005-2009