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Paper is mostly cellulose, like wood, from which it is made.

It is composed of atoms of carbon and hydrogen and oxygen. When heated, the molecules combine to form carbon dioxide, water, and other oxidized elements (such as calcium and potassium oxides), which form the wood ash. The oxidation is an exothermic reaction as the carbon-hydrogen bonds contain substantial chemical energy.

As with food oxidation (carbohydrates), the energy was stored in the wood by the growth of the plants (trees).

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10y ago
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13y ago

Paper is mostly cellulose strands since it is made from wood or cotton most of the time. Cellulose is a long polymer of glucose, a sugar, that is composed of carbon, oxygen and hydrogen. The exothermic chemical reaction, fire, releases the carbon in up to three forms: elemental carbon, carbon dioxide and carbon monoxide. Meanwhile, the hydrogen combines with any available alcohol group (OH) from the sugar to form water (dihydro-monoxide), a very stable compound. Of course, this perfect picture is complicated by any print or colored inks on that paper which may contain sulfur and by the nitrogen-rich medium in which the chemical reactions happen: air. Here stable nitrogen-oxygen and to a lesser extent nitrogen-hydrogen compounds of nitrogen oxide(NO2 and NO) and ammonia(NH4) respectively may form.

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11y ago

Even though wood is mostly composed of two chemicals, cellulose and lignin, it is a complex product of biological processes and it contains many different chemicals. Some chemicals, when they are burned, produce only gas products, usually carbon dioxide and water vapor. Others produce solid products known as ash.

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10y ago

Ash is a incombustible residue, formed generally from oxides.

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8y ago

because when paper burn it burns some of the mass with it

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Q: When paper is burned why is the mass of the remaining ash less the the mass of the original paper?
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