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Combustion Reactions are always reacted with Oxygen gas in this case if you had C3H8+O2 you will ALWAYS get H2O+CO2 it does not matter if you have C100H54+O2 you will still get H2O+CO2 this is why combustion reactions are considered exceptions to the rules of a product or chemical reaction.

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Q: Why are combustion reactions considered exceptions to the rules of chemical reactions?
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Why are combustion reactions considered exceptions to the rules?

Combustion reactions always include O2 (Oxygen Gas) and a hydrocarbon (hydrogen and carbon) and the products are always CO2 and H2O. So, for example, you have C200H108 + O2 then the products will still be CO2 and H2O. It is considered an exception because normally, in chemical equations, the amount of reactants have to equal the amount of products.


What chemical element is needed for combustion reactions?

oxygen


What chemical reactions happen when a firework is lit?

combustion...


What chemical reactions do both ethane and ethene undergo?

Combustion.


Is nitrogen a combustion reaction?

Nitrogen is not a reaction, it is a chemical element. It is not normally involved in combustion reactions.


What process that converts chemical energy to thermal energy?

Combustion! and chemical reactions to pizza


Ways in which chemical reactions can be identified?

Well there are double and single displacement reactions, combustion and decomposition.


Chemical reaction that produces heat?

Chemical reactions that produce heat (or energy) are known as Exothermic Reactions. (Example: combustion of fuels)


What Kinds of chemical changes?

Exothermic reactions. E.g. combustion, oxidation


Is fireworks a physical change?

No. Fireworks are an example of a chemical change called combustion.


Is combustion a physio-chemical reaction?

Combustion or burning is the sequence of exothermic chemical reactions between a fuel and an oxidant accompanied by the production of heat and conversion of chemical species.


What comes out of chemical reactions?

4 useful chemical reactions are: fermentation, smelting combustion and electrolysis