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WAEC Chemistry 2021 Paper

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Question : 42

Total: 50

Consider the following energy profile diagram and use it to answer the question that follows

The enthalpy change of the reaction is------------

$E _{A}$
$E _{B}$
$E _{C}$
$E _{D}$

Solution:

Concept:

Enthalpy change is the energy difference between the products and the reactants.

Explanation:

In the energy profile diagram, the vertical gap between the product energy level and the reactant energy level represents the enthalpy change of the reaction.

This vertical gap is labelled

E_B

.

Since the products are at a higher energy level than the reactants, the reaction is endothermic.

Answer:

B.

E_B

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