What is produced by the burning of candles, what is produced when a candle is burned?

There are two processes in wax combustion: melting by heat and forming other substances.

1.It is a physical phenomenon that wax melts when heated.

2.Wax combustion to produce water and carbon dioxide is a chemical reaction.

Wax combustion is a chemical reaction that melts after being heated and melted first, and when the flammable temperature is reached, other substances are formed.

The physical properties of paraffin wax are solid at room temperature, insoluble in water, low melting point, easy to melt, and soft. Its chemical properties are: paraffin wax is flammable, emitting light and exothermic when burning.

**EXPERIMENT NAME: On the candle and its burning**.

**Objective: To observe the candle in detail in the three stages before lighting, when it is lit and after it is extinguished, and learn to observe the change process and phenomenon of matter completely.

Laboratory supplies: a new candle, matches, a clean beaker, water, a sink, clarified lime water, a knife.

Experimental Procedures and Methods:

1. Observe the color, shape, state, and hardness of the candle; Smell it.

Phenomenon: Candles are white, soft, cylindrical solids, odorless, and composed of white cotton thread and paraffin wax.

2 Cut off a piece of paraffin wax with a knife and put it in the sink to observe its phenomenon in the water.

Phenomenon: Paraffin wax floats on the surface of the water and is insoluble in water.

Conclusion: Paraffin wax is a solid with a smaller density than water and is insoluble in water.

3 Light the candle and observe its changes and how its flame compares with the temperature of its layers.

Phenomenon: Paraffin wax melts when heated, glows, emits black smoke, and exothermic when the candle burns.

The candle flame is divided into three layers: the outer flame, the inner flame, and the flame center, with the outer flame having the highest temperature and the lowest flame center.

Conclusion: Paraffin wax melts when heated, and carbon black is formed when burned.

4 Place the dry beaker over the candle flame, observe the phenomenon on the wall of the beaker for a moment, remove the beaker and pour in a small amount of lime water. oscillation, observe its phenomenon.

Phenomenon: Many small water droplets appear on the walls of the dry beaker. After removing the beaker, quickly pour in the clarified lime water, shake, and the lime water becomes cloudy.

Conclusion: When the candle is burned, two substances are produced: water and carbon dioxide, which can make lime water turbid.

5 Extinguish the candle and observe its phenomenon, and light the white smoke when it was first extinguished with a match, and observe what happens.

Phenomenon: The molten paraffin wax gradually solidifies, and the white cotton thread candle core turns black and fragile. Use a match to light the white smoke that has just been extinguished, and the candle will burn again.

Conclusion: When the paraffin wax is condensed, carbon black is produced when burned, the cotton thread is carbonized, and the white smoke is composed of fine paraffin particles, which is flammable.

Conclusion: Candles can be burned in the air, and many new substances can be produced during and after the combustion process.

Recent research has found that tiny diamonds are produced, but they are quickly burned and disappear. No one really knows what is burned, water and carbon dioxide are the simplest explanations, and incomplete combustion can also produce carbon monoxide and pure carbon, but it's much more than that.

No matter what, water vapor is just another state of water, the same, it's okay.

Isn't water vapor just gaseous water?

When the candle is burned, it produces: carbon dioxide and water.

Verification: Light the candle, cover a cold and dry beaker over the candle for 5 minutes, quickly invert the beaker, and find that the inner wall of the beaker becomes blurred and water droplets are generated, indicating that the candle burns to produce water.

A small amount of clarified lime water was added to the beaker and shaken, and it was observed that the clarified lime water became turbid, indicating that the candle burned to produce carbon dioxide.

The main component of the candle is carbon oxides, which react with oxygen in the air during combustion to produce water and carbon dioxide. The flame of a candle is divided into three parts, which are divided into the outer flame, the inner flame, and the flame center. The outer flame temperature is the highest, the flame core temperature is the lowest, and the inner flame is the brightest.

Nature of the candle:

The main raw material of candles is paraffin wax (CH) Paraffin wax is prepared from the wax-containing fraction of petroleum by cold pressing or solvent dewaxing, which is a mixture of several high-grade alkanes, mainly n-docosane (C22H46) and n-octadecane (C28H58), containing about 85% carbon and 14% hydrogen. The added excipients are white oil, stearic acid, polyethylene, flavor, etc., among which stearic acid (C17H35COOH) is mainly used to improve softness, and the specific addition depends on what kind of candle is produced.

It is easy to melt, the density is less than that of water, and it is difficult to dissolve in water. It melts into a liquid state when heated, colorless, transparent and slightly volatile when heated, and can smell the unique odor of paraffin. When cold, it solidifies into a white solid form with a slight special odor.

The main raw material of candles is paraffin, which is mainly composed of n-docosane (C22H46) and n-octadecane (C28H58), which produce water and carbon dioxide after combustion.

The candle burning equation is as follows:

The flame of the 2C22H46+67O2=44CO2+46H2O2C28H58+85O2=56CO2+58H2O candle is divided into three parts, which are divided into the outer flame, the inner flame and the flame center. The outer flame temperature is the highest, the flame core temperature is the lowest, and the inner flame is the brightest.

The products of candle burning are carbon dioxide and water.

When a candle burns, the products of combustion are carbon dioxide and water. Its chemical expression is C25H52+O2 (ignition)CO2+H2O. The combustion phenomenon in the oxygen cylinder is that the flame is bright and emits white light, emitting heat, and there is a mist of water on the wall of the cylinder.

A simple proof experiment is as follows:

Light the candle, cover a cold and dry beaker above the candle for 5 minutes, and then quickly invert the beaker, and find that the inner wall of the beaker is blurred and water droplets are formed, indicating that the candle burns to produce water. A small amount of clarified lime water was added to the beaker and shaken, and the clarified lime water was observed to become turbid, indicating that the wax-sensitive candle burned to produce carbon dioxide.

1. The products after the candle is burned are: carbon dioxide (CO2), water (H2O), and a small amount of carbon and hydrocarbons that are not completely burned.

2. The main raw materials of candles:

Paraffin, paraffin, is a candle on a birthday cake made from a waxy fraction of petroleum that is cold-pressed or solvent dewaxed, and is a mixture of several high-grade alkanes.

3. The principle of burning and melting candles:

1) From a macroscopic point of view, any substance has a melting boiling point, that is, any substance will dissolve and then vaporize when heated to a certain temperature.

2) From a molecular point of view, heating can intensify the movement of molecules, so that the range of motion becomes larger, and the space between molecules and molecules becomes larger, so that the solid slowly becomes focal and has the properties of liquid.

1. The product of candle burning is: carbon dioxide.

CO2), water (H2O), and small amounts of unburned intact carbon and hydrocarbons.

2. The main material of the candle is paraffin. Paraffin wax is prepared from the pure fraction of petroleum wax-containing distillation hood by cold pressing or solvent dewaxing, and is several high-grade alkanes.

The mixture of the tomb is melted into a liquid state when heated, colorless and transparent and slightly volatile when heated, and the unique smell of paraffin wax can be smelled, and it solidifies into a white solid form when cold, with a slight special smell.