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The graph represents the change in that occurs when food is cooked over a charcoal grill. Which statement correctly explains the graph?A. The reactants are unlit charcoal that has already released its energy, and the products are charcoal that has already burned.B. The reactants are charcoal that has already burned and released its energy, and the products are unlit charcoal.C. The reactants are unlit charcoal, and the products are charcoal that has already burned and released its energy.D. The reactants are charcoal that has already burned, and the products are unlit charcoal that has already released its energy.

The graph represents the change in that occurs when food is cooked over a charcoal-example-1
User Carelinkz
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The answer is C.

The reactants are charcoal that is unlit + oxygen and the products are the burnt charcoal + energy.


C_xH_y+O_{2\text{ }}\rightarrow CO_2+H_2O\text{ + heat}

So for every combustion reaction like this one, CxHy is the wood. So before you light the wood, it is actally a reactant together with oxygen, because without oxygen the wood will not burn. So under the influence of heat, wood produces substances like carbon dioxide and heat, the moment you see wood burning it it already producing products, CO2 and heat (which is the fire). This is a combustion reaction.

Combustion reaction is exothermic because it releases energy.

User MrJaeger
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