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@Calgary

My understanding is that all substances has chemical energy. and it can be converted to other forms of energy by different forces or processes.

mikesmith(老猫)
Chemical energy is the energy due to associations of atoms in molecules and various other kinds of aggregrates of matter. It may be defined as a work done by electric forces during re-arrangement of electric charges, electrons and protons, in the process of aggregration. If the chemical energy of a system decreases during a chemical reaction, it is transferred to the surroundings in some form of energy (often heat); on the other hand if the chemical energy of a system increases as a result of a chemical reaction - it is by converting another form of energy from the surroundings.
(#4086690@0)
Last Updated: 2007-11-28
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Replies, comments and Discussions:

  • 枫下家园 / 望子成龙 / Pizza stores chemical engery, yes or not??????????????? -------------help>>>><<< -richardjia(ha); 2007-11-28 {288} (#4086618@0)
    the teacher of my daughter havea question in her testing page, moving car has mechnical enegry, then let they illustmate the chemical enegry,

    my daughter wrote Pizza and Apple, the teacher thought wrong, and at Term1 give her C+,

    I supported my daughter thought, everyone comment??
    • My understanding is that all substances has chemical energy. and it can be converted to other forms of energy by different forces or processes. -mikesmith(老猫); 2007-11-28 {585} (#4086690@0)
      Chemical energy is the energy due to associations of atoms in molecules and various other kinds of aggregrates of matter. It may be defined as a work done by electric forces during re-arrangement of electric charges, electrons and protons, in the process of aggregration. If the chemical energy of a system decreases during a chemical reaction, it is transferred to the surroundings in some form of energy (often heat); on the other hand if the chemical energy of a system increases as a result of a chemical reaction - it is by converting another form of energy from the surroundings.
    • My understanding is that the teacher was expecting answers like: the burning of gas. -qq0785(花椒); 2007-11-28 (#4086721@0)
      • this is a transfermation to thermal energy when the chemical energy of a system decreases during a chemical reaction, not chemical energy itself. -mikesmith(老猫); 2007-11-28 (#4086904@0)
    • Battery has chemical -kevinwng(kevinwang); 2007-11-28 (#4086760@0)
      • actually everything has chemical energy according to its definition. -mikesmith(老猫); 2007-11-28 (#4086906@0)
    • 我觉得老师问的是能量的利用，人吃pizza和苹果是可以把化学能转化成人体运动的机械能，但pizza和苹果本身不是化学能。 -lalam(今日无忧); 2007-11-28 (#4086788@0)
    • Thanking for all above, I will ask her teacher in interview tomorrow morning -richardjia(ha); 2007-11-29 {75} (#4089223@0)
      If we can say food stores chemical enegry then why Pizza and Apple can not?

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