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The burning of natural gas, CH4 + 2O2 -> CO2 + 2H2O, is an example of which type of reaction?

Question
The burning of natural gas, CH4 + 2O2 -> CO2 + 2H2O, is an example of which type of reaction?
An endothermic decomposition reaction
An exothermic combination reaction
A displacement reaction
A double displacement reaction
Answer
An exothermic combination reaction
Detailed Explanation
Methane combines with oxygen to release heat, making this both a combination reaction and an exothermic reaction.
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