Which of the figures proves that paired electrons within covalent bonds of molec

Question

Which of the figures proves that paired electrons within covalent bonds of molecules are the source of molecular energy that powers your cells, although some of the energy is unused? Using heat to do work. A, Boiling water on an open campfire. B, Coal-powered electrical plant uses steam to generate electricity. C, Spinning magnets produce electron flow in copper wires ATP is an energy rich molecule held together by covalent bonds When the bond between the second and last phosphate molecule is broken energy is released. The by products are then recycled and reconverted into ATP to be used once more. Energy is only released when bonds form.

Explanation / Answer

In Fig. A, water is boiled in open campfire. Campfire uses basically wood. Wood is a form of carbon. So, in this process, carbon is being burnt to produce heat and light. The C combines with oxygen molecules and produce CO2.

C + O2 ----> CO2 + heat

The covalent linkage between O-O in O2 is broken and this breaking produces energy. The process is an exothermic reaction, so heat produced is more than heat used in process. So, the breaking of covalent molecules is a source of molecular energy. Similarly, in Fig. B, coal is burnt to produce electricity. Here also same reaction happens. The heat produced is further used in producing electricity.

But in Fig. c, there is no breaking of bonds.

So, Fig. A and B shows breaking of covalent molecules is a source of molecular energy.

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