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atste Look around in your house and in your neighborhood if there are some cut/broken/teared materials and identify whether it is beneficial or not beneficial. Write at least 10 answers on the table provided. Check (V) for beneficial and (x ) for not beneficial. Solid Materials 1. Firewood Beneficial Not Beneficial 2. 3. 4. 5. 6. 1: 8. 9. 10.​

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Answer:

Many materials in our environment, including wood products, burn “indirectly” in the sense that the materials do not actually burn, but combustion takes place as a reaction between oxygen and the gases released from a material (an exception from this rule is the glowing combustion of charred wood where oxygen reacts directly with carbon). Under the influence of heat, wood produces easily substances that react eagerly with oxygen, leading to the high propensity of wood to ignite and burn.

Ignition and combustion of wood is mainly based on the pyrolysis (i.e. thermal decomposition) of cellulose and the reactions of pyrolysis products with each other and with gases in the air, mainly oxygen. When temperature increases, cellulose starts to pyrolyse. The decomposition products either remain inside the material or are released as gases. Gaseous substances react with each other and oxygen, releasing a large amount of heat that further induces pyrolysis and combustion reactions. Pyrolysis and burning processes are illustrated in Figure 1.

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