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When fuels burn, a combustion reaction is observed. This means that the fuel, which is made predominantly from carbon and hydrogen is heated in the presence of oxygen. If there is sufficient oxygen, you will have carbon dioxide and water produced. This is called complete combustion. When there is insufficient amounts of oxygen, the fuel cannot burn to completion, so you will get carbon dioxide, carbon, and/or carbon monoxide; and of course, water. This is called incomplete combustion.

So to sum up your answer, when burnt with enough oxygen present, the gas that is formed will be carbon dioxide. If there is insufficient oxygen, then you will get carbon dioxide and carbon monoxide. Carbon is not included as it is a solid, not a gas. This is a chemical change and it happens because the reactants (fuel and oxygen) become excited when reacted with each other and the atoms rearrange themselves to form a new product.

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What harmful gas is being released when engines burn fossil fuels?

Carbon monoxide is released.


Why some fuels burn completely in air and others do not?

Some fuels burn completely in air due to their chemical composition and the availability of oxygen for combustion. Fuels with a higher hydrogen-to-carbon ratio, such as natural gas, tend to burn more completely because they produce more water vapor and less soot. Conversely, fuels with complex structures or higher carbon content, like coal or heavy oils, may not burn completely, leading to incomplete combustion and the production of carbon monoxide, soot, and other pollutants. Additionally, factors such as temperature, pressure, and mixing efficiency with air also influence the completeness of combustion.


What is the chemical name for fossil fuels?

Fossil fuels are non renewable source of energy. They are formed by the decomposition of wastes of plants and animals which were buried underneath the earth million years ago. ex: coal,oil, wood etc.


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Methane, natural gas, liquefied petroleum gas (LPG), butane, propane, acetylene, ethylene are gases that can be used as fuels.


What are fossil fuels which non-renewable energy resources are fossil fuels?

Fossil fuels are natural energy resources formed from the decomposed remains of ancient plants and animals, subjected to heat and pressure over millions of years. The main types of fossil fuels include coal, oil, and natural gas. These resources are considered non-renewable because they take millions of years to form and are being consumed much faster than they can be replaced. Their extraction and use contribute significantly to greenhouse gas emissions and climate change.