Is carbon dioxide a chemical reaction?

Just carbon dioxide itself... (like from fossil fuels, cars, etc.)

Carbon dioxide, CO2, is not a chemical reaction by itself. However, it is a product of a chemical reaction. When fossil fuels burn or gasoline is used in cars, CO2 is one of the products formed. Usually water, H2O, is formed at the same time CO2 is formed.

Carbon dioxide (CO2) is not a chemical reaction itself, but rather a molecule that is produced as a result of chemical reactions. When substances containing carbon, such as fossil fuels or car exhaust, undergo combustion or metabolism, carbon atoms combine with oxygen from the air to form carbon dioxide.

To understand why carbon dioxide (CO2) is produced, you need to know that carbon (C) readily forms bonds with oxygen (O) atoms. When a carbon-containing substance, such as gasoline or natural gas, undergoes combustion, it reacts with oxygen from the atmosphere. This reaction releases energy and forms carbon dioxide as a byproduct:

C + O2 -> CO2

Similarly, in living organisms, when sugars and carbohydrates are broken down during metabolic processes, carbon atoms combine with oxygen to form carbon dioxide as a waste product.

To summarize, carbon dioxide is not a chemical reaction itself but a molecule that is produced as a result of the chemical reactions involving carbon-based substances and oxygen.