When oxygen combines with another substance (as fuel) and produces fire with heat and light, combustion
occurs. The following are always present in combustion EXCEPT:
A. oxygen B. fuel C. heat D. carbon dioxide
occurs. The following are always present in combustion EXCEPT:
A. oxygen B. fuel C. heat D. carbon dioxide
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Answer:
D. carbon dioxide
Explanation:
Oxygen, heat, and fuel are frequently referred to as the "fire triangle." Add in the fourth element, the chemical reaction, and you actually have a fire "tetrahedron." The important thing to remember is: take any of these four things away, and you will not have a fire or the fire will be extinguished.
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