A student draws an energy level diagram for the combustion of methane. The energy level of the products is lower than the energy level of the reactants.

Which statement about this reaction is correct?

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Question

A student draws an energy level diagram for the combustion of methane. The energy level of the products is lower than the energy level of the reactants.

Which statement about this reaction is correct?

Accepted Answer

The reaction is exothermic and ΔH is negative — Award 1 mark for correctly identifying that when products are at a lower energy level than reactants, the reaction is exothermic with a negative ΔH value. A is incorrect — endothermic reactions have products at higher energy levels. B is incorrect — endothermic reactions have positive ΔH values. C is incorrect — exothermic reactions have negative, not positive, ΔH values.

Answer

The reaction is exothermic and ΔH is positive

Answer

The reaction is endothermic and ΔH is positive

Answer

The reaction is endothermic and ΔH is negative

Answer

The reaction is exothermic and ΔH is negative

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