The phenomenon of wood chip burning and charcoal burning is more detailed

Comparison of wood chips and charcoal burning.

Charcoal burning: aReddish light, exothermic aReddish glow, exothermic.

Wood chips burned: bThere is a flame, which is exothermic and produces a small amount of black smoke bThere is a flame, which is heat-emitting, producing a small amount of black smoke.

Cover a small cold and dry beaker above the flame, find that there is no water mist on the beaker wall above the red hot charcoal, turn the beaker upside down, quickly pour a small amount of clarified lime water into the beaker, shake, lime water becomes turbid.

It means that charcoal burning does not produce water, but carbon dioxide. The beaker covered with the flame of the wood chips has a mist of water, which is reversed, and a small amount of clarified lime water is poured into the beaker, and the lime water becomes turbid when it is shaken.

Explaining that the burning of wood chips produces both water and carbon dioxide, it is concluded that the composition of wood chips and charcoal is different (fill in "same" or "different").

Comparison of wood chips and charcoal burning.

Difference Between Wood Chips and Charcoal Burning:

Wood chips: easy to ignite, there is a flame when burning, and black smoke is emitted.

Charcoal: not easy to ignite, burns without flame (or with a blue flame).

The main reason why charcoal is different from wood chips is that the water and volatile flammable substances (grease, hydrocarbons, etc.) inside the charcoal have been disposed of before ignition. So when burning, it just reddens and does not smoke. Sometimes you see a blue flame when charcoal burns because the red-hot charcoal meets CO2 to produce CO, and CO burns with a blue flame.

Flames are produced by the combustion of flammable gases or vapors. Charcoal is solid and has a high melting point, so it will not be c-vapor combustion when burned, and there should be no flame. Charcoal is commonly burned with flames for two main reasons:

First, charcoal contains flammable wood tar, which is gasified and burned to produce flames; Second, in the process of charcoal combustion, at high temperature, a part of CO2 is reduced to CO by C, and CO combustion produces flames. In the second case, piles of charcoal need to be burned.

<> characteristics are different, the combustion effect is different, and the function is different.

1. Different characteristics: Wood is the product of forest owners, which plays a great supporting role in human life, and people use them in different ways according to the different properties and characteristics of wood. Wild burning forest charcoal is a dark brown or black porous solid fuel left over from incomplete combustion of wood or wood raw materials or pyrolysis under the condition of air isolation.

2. The combustion effect is different: when the charcoal is burned, there will be no raging flames and smoke, there will be no choking smell, and the harmful substances produced by the acres are much less than those of burning firewood. And when wood is burned, it produces a lot of smoke and a choking smell.

3. The function is different: wood is burned directly, and the same wood is made into charcoal and then burned (the quality of charcoal will be much smaller), and the burning time will not be longer than wood. Charcoal is made of carbon disulfide.

The charcoal used to make carbon disulfide should be hard, heavy in volume and ash.

and low moisture content and high fixed carbon content.

The phenomenon of charcoal burning in the air is that charcoal can burn violently in oxygen, emit dazzling white light, release a large amount of heat, and generate a gas that makes the clarified lime water turbid.

Charcoal is the name of a fuel. It is a dark brown or black porous solid fuel left over from incomplete combustion of wood or wood raw materials or pyrolysis under the condition of insulating air. The phenomenon of charcoal burning in oxygen is that charcoal can burn violently in oxygen, emit dazzling white light, release a large amount of heat, and generate gas that makes the clarified lime water turbid.

The literal expression for charcoal burning is: carbon + oxygen = ignition = carbon dioxide.

The chemical expression of charcoal burning is: C + O2 = Ignition = CO2.

The main component of charcoal is carbon, the ash content is very low, the calorific value is about megajoules, in addition to hydrogen, oxygen, nitrogen and a small amount of other elements, the content of which has little to do with the tree species, mainly depends on the final temperature of carbonization. Charcoal is a hydrophobic substance, the ash content is within 6%, the pores account for more than 7% of the charcoal volume, the specific gravity is generally, the calorific value depends on the carbonization conditions, generally about 8000 kcal kg, the reducing capacity of charcoal is greater than that of coke. Charcoal has a large number of micropores and transition pores, so that it not only has a high specific surface area, but also has good adsorption properties after the tar substances in the pores are excluded.

Complete combustion with oxygen produces carbon dioxide, and incomplete combustion produces the toxic gas carbon monoxide. Relatively loose.

The burning of charcoal belongs to ().

a.Smoldering (correct answer).

b.Evaporative combustion.

c.Surface burning.

d.Decompose combustion.

Answer analysis: According to page 53 of "Basic Knowledge", "the combustion of charcoal, charcoal, iron, copper and other substances is typical surface combustion". Combined with the meaning of the topic, this question should be selected as "surface burning".