Combustion Formula: Definition, Examples, Formulas, Applications (2022)

Combustion reaction results in the production of fire. At a high temperature, combustion takes place. The main element in the combustion process is oxygen, and combustion cannot take place without it. Combustion is divided into two types. They are complete combustion and incomplete combustion. The entire combustion process is hydrocarbon oxidation, which produces solely CO2 and H2O. For instance, consider the clean combustion of candle wax. We will discuss more about combustion in this article.

Table of Content

  1. Combustion
  2. Combustion Reaction Examples
  3. Combustion Reaction Types
  4. The Formula of Combustion reaction
  5. Combustion Reaction Harmful effects
  6. Things to remember
  7. Sample Questions

Key Terms: Combustion, Combustion Reaction, Redox Reactions, Carbon Dioxide, Oxygen

Combustion

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A combustion reaction results in the production of fire. At a high temperature, combustion takes place. It is a redox chemical reaction in which heat is released (exothermic) and usually happens between a fuel and an oxidising agent (mostly oxygen of the atmosphere). The expelled products are frequently gaseous, and the resulting combination is commonly referred to as smoke. Oxides are the byproducts of combustion.

Combustion Formula: Definition, Examples, Formulas, Applications (1)

Combustion Reaction

Combustion Reactions Examples:

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  • CH4(g) combines with 2 molecules of O2(g) to produce CO2 (g) and 2 molecules of H2O during methane combustion (g).
  • C10H8 interacts with 12 molecules of O2 during the naphthalene burning process to produces:

10 CO2 + 4 H2O

  • The reaction between 2 C2H6 and 7 O2 in ethane combustion produces

4 CO2 + 6 H2O as the outcome

  • The process of butane combustion is widely seen in lighters. When 2C4H10(g) combines with 13O2(g), the resulting is

8CO2(g) +10H2O(g) following combustion

(Video) Introduction to Combustion Analysis, Empirical Formula & Molecular Formula Problems

  • Propane is burned in grills, fireplaces, and other appliances. After the combustion of

2C3H8(g) and 7O2, 6CO2(g) + 8H2O(g) is generated (g)

  • The main element in the combustion process is oxygen, and combustion cannot take place without it.

Combustion Formula: Definition, Examples, Formulas, Applications (2)

Combustion Reaction Examples

Combustion Reactions Types

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Complete Combustion: When a fuel burns fully to produce carbon dioxide and heat with an adequate supply of oxygen, it is called complete combustion.

Incomplete Combustion: When there is a limited or partial supply of oxygen the fuel burns inefficiently, resulting in the production of carbon monoxide rather than carbon dioxide.

Formula for Combustion

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The heat produced during combustion is equal to the product formation heat minus the reactant formation heat.

The entire combustion process is hydrocarbon oxidation, which produces solely CO2 and H2O. For instance, consider the clean combustion of candle wax.

Incomplete combustion is the oxidation of hydrocarbons that results in the production of carbon monoxide (CO) in addition to CO2. Consider coal burning, which produces a lot of soot and carbon monoxide.

Combustion's Harmful effects

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The chemical energy held in fuel is transformed to heat and light during combustion. Combustion is used to move trains, vehicles, and industrial machines, among other things. The smoke produced by burning pollutes the environment.

The number of industries is growing all the time. As a result, the constant burning of fuels, as well as the production of smoke from chimneys and vehicle exhausts, contribute to the increase in carbon dioxide in the atmosphere, causing it to change its original composition.

(Video) Balancing Combustion Reactions

Carbon dioxide and other combustion products act as greenhouse gases, trapping solar radiation and raising the earth's temperature, resulting in a significant problem known as global warming. When combustion isn't done properly, hazardous chemicals including carbon monoxide and particulate matter are generated.

Sulphur dioxide, nitrogen dioxide, and other organic molecules combine to generate ozone and smog at ground level. The most significant source of air pollution is the combustion of fossil fuels. Installing catalytic converters can improve the efficiency of internal combustion engines.

Electrostatic precipitators should be installed in chimneys so that the emitted smoke does not pollute the environment as much as it would otherwise.

Things to Remember

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A combustion reaction results in the production of fire. At a high temperature, combustion takes place. It is a redox chemical reaction in which heat is released (exothermic) and usually happens between a fuel and an oxidising agent (mostly oxygen of the atmosphere).

CH4(g) combines with 2 molecules of O2(g) to produce CO2 (g) and 2 molecules of H2O during methane combustion (g).

C10H8 interacts with 12 molecules of O2 during the naphthalene burning process to produce 10 CO2 + 4 H2O.

Propane is burned in grills, fireplaces, and other appliances. After the combustion of 2C3H8(g) and 7O2, 6CO2(g) + 8H2O(g) is generated (g).

Carbon dioxide and other combustion products act as greenhouse gases, trapping solar radiation and raising the earth's temperature, resulting in a significant problem known as global warming. When combustion isn't done properly, hazardous chemicals including carbon monoxide and particulate matter are generated.

Electrostatic precipitators should be installed in chimneys so that the emitted smoke does not pollute the environment as much as it would otherwise.

Sample Questions

Ques. Write the Methane Combustion Formula. ( 1 Marks)

Ans. Methane combustion is a multi-step reaction that can be summarised as follows: CH4 + 2 O2 → CO2 + 2 H2O (at standard circumstances, ΔH = -891 k J/mol)

(Video) What is combustion?

Ques. Write the ethane combustion formula. ( 1 Marks)

Ans. C2H6+5O2→2CO2+3H2O Heat is the balanced equation for complete ethane combustion.

Ques. What is the definition of spontaneous combustion? What does spontaneous combustion look like in practice? ( 2 Marks)

Ans. Spontaneous combustion is a reaction that occurs without the assistance of any external heat source. Because some compounds, such as phosphorus and sulphur, have a low ignition temperature, this occurs. When the temperature rises in the summer, many chemicals only attain their ignition temperature at room temperature. As a result, they begin to burn spontaneously without the introduction of heat.

Ques. The majority of elements react with oxygen, but why aren't all of these events termed combustion? ( 2 Marks)

Ans. The majority of elements do, in fact, experience a reaction with oxygen. These reactions, however, are referred to as oxidation rather than combustion. The release of heat, light, and energy are all necessary for combustion to occur. Because of the heat emitted during this process, the reaction is highly intense, and it must be regulated in a timely manner to prevent a dangerous fire from forming. Combustion is distinguished from oxidation by its violent character.

As a result, while combustion is fundamentally oxidation, not all oxidations are combustions.

Ques. What's the difference between combustion that's complete and combustion that's incomplete? ( 2 Marks)

Ans. Complete combustion occurs when there is enough oxygen available, whereas incomplete combustion occurs when there is not enough oxygen available.

The hydrocarbon fuel burns with a blue flame during a complete combustion reaction, while the hydrocarbon fuel burns with a yellow sooty flame during an incomplete combustion reaction.

Ques. Which types of combustion are dangerous? ( 2 Marks)

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Ans. Both total and incomplete combustion are extremely harmful if carried out in excess. Global warming is caused by excessive burning. Because of the amount of carbon dioxide generated during the reaction, this is the case. Excessive incomplete combustion pollutes the air (due to the production of carbon monoxide, which can also cause lung diseases). Apart from that, both reactions produce water as a by-product, which has an impact on the environment and raises humidity levels.

Ques. Why is ethanol combustion exothermic? ( 2 Marks)

Ans. As a flammable fuel, ethanol is employed. The net reaction that occurs during the burning of ethanol is seen in the animation below. It should be emphasised that the combustion of ethanol necessitates the presence of oxygen.

An alcohol combustion reaction is an exothermic event that releases heat energy.

Ques. What is a combustion reaction? ( 2 Marks)

Ans. Redox reactions include combustion processes. An illustration of a combustion reaction with oxygen as the oxidant. A molecule of C and H reacts with O2 to generate CO2 and H2O in the traditional chemistry class combustion reaction. Other elements, such as O, S, or N, may be present in the reactant.

Ques. What is a complete combustion reaction? ( 2 Marks)

Ans. Complete combustion reactions, sometimes referred to as clean combustion reactions, involve the complete oxidation of the fuel (usually a hydrocarbon). Such reactions often liberate only water and carbon dioxide as the products. A common example of a clean combustion reaction is the combustion undergone by wax candles. Wax is a hydrocarbon which undergoes clean combustion to yield only carbon dioxide and small amounts of water as the product. It can also be noted that no ash/byproducts are left behind when the entire candle is burnt out.

Ques. Is combustion exothermic or endothermic? ( 1 Marks)

Ans. Overall, combustion is an exothermic reaction given off or exiting , which means that energy is released. Usually, heat and light are released during a combustion reaction.

Read Also:

Decomposition Reaction Displacement Reaction Metals and Non-metals
Corrosion Rancidity Dinitrogen
Oxides of Nitrogen Oxides of Phosphorus Emulsions
Phosphine Aqua Regia Phosphine
Colloids Nitric Acid Brown Ring Test
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FAQs

What is an example of combustion formula? ›

The products of a complete combustion reaction include carbon dioxide (CO2) and water vapor (H2O). The reaction typically gives off heat and light as well. The general equation for a complete combustion reaction is: Fuel + O2 → CO2 + H2O.

What are 5 examples of combustion reactions? ›

What are the applications of combustion? ›

Combustion processes occur in many modern technologies, such as: power production, heating, automotive and aircraft engines and even explosion research. The application areas range from fuel injection and mixing and flow velocity information, to measurements of combustion species and soot concentration.

What is combustion example? ›

A familiar example of a combustion reaction is a lighted match. When a match is struck, friction heats the head to a temperature at which the chemicals react and generate more heat than can escape into the air, and they burn with a flame.

What are the types of combustion? ›

They are:
  • Rapid Combustion,
  • Spontaneous Combustion, and.
  • Explosive Combustion.
Mar 10, 2022

Which example is a combustion reaction? ›

Examples of Combustion Reactions

Imagine the wood burning in a fireplace. The wood is fuel which continuously reacts with oxygen in the air in a combustion reaction. The fire produced is energy being released in a long exothermic reaction, while the smoke you see is carbon dioxide.

What is combustion answer? ›

Combustion is a chemical process or a reaction between Fuel (Hydrocarbon) and Oxygen. When fuel and oxygen react it releases the heat and light energy. Heat and light energy then result in the flame. So, the formula for Combustion reaction is Hydrobcarbon + Oxygen = Heat energy.

What is combustion example class 10? ›

A combustion reaction will always occur when a substance reacts with oxygen to release energy. For example, when methane burns in oxygen, it releases carbon dioxide and water. The formation of carbon dioxide shows the carbon present in the methane has undergone oxidation.

What is combustion process? ›

Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. The original substance is called the fuel, and the source of oxygen is called the oxidizer. The fuel can be a solid, liquid, or gas, although for airplane propulsion the fuel is usually a liquid.

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