A chemical change takes place when new chemical species is/are formed. In case of a car engine, chemical change takes place due to combustion of fuel. Most of the cars run on either gasoline (also known as petrol) or diesel. Both of these are organic fossil fuels. When combustion of these fuels take place, simpler compounds are formed. For example, complete combustion of these fuels will produce carbon dioxide and water. Since the combustion process is not very efficient and fuels also contain some impurities, we end with other products as well. These products may include, carbon monoxide, nitrogenous oxides (or NOx), sulfurous oxides ( or SOx), etc. Thus, combustion of fossil fuels is the cause of chemical changes in a car engine.
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