CH-1245

Energy profile diagrams

Chemistry · Secondary 4 · Hard · Energy profile diagrams

A student draws an energy profile diagram for the combustion of methane, CH

_4

. The reaction is exothermic with an enthalpy change of

-890

kJ/mol.

Which statement about the correct energy profile diagram is true?

Reactants are lower than products and $\Delta H$ is labelled +890 kJ/mol.
Reactants and products are at the same energy level and $\Delta H$ is 0 kJ/mol.
Reactants are higher than products and $\Delta H$ is labelled −890 kJ/mol.
Products are higher than reactants and $\Delta H$ is labelled −890 kJ/mol.

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