Question

Look at the following energy diagram. Select the appropriate description

Cart
CH =
-0.45 kcal
molec
Products
+AH
Enthalpy
Congo
Reactants
Peaction Coordinate
The reaction is endothermic and the products have a higher AH than the reactants
The reaction is exothermic and the products have a lower AH than the reactants
The reaction is endothermic and the products have a lower
than the reactants
The reaction is exothermic and the products have a higher AH than the reactants.

Answer 1

Answer : The correct option is, The reaction is endothermic and the products have a higher AH than the reactants.

Explanation :

Endothermic reaction : It is defined as the chemical reaction in which the energy is absorbed from the surrounding.

In the endothermic reaction, the energy of reactant are less than the energy of product.

Exothermic reaction : It is defined as the chemical reaction in which the energy is released into the surrounding.

In the exothermic reaction, the energy of reactant are more than the energy of product.

Enthalpy change : It is the difference between the energy of product and the reactant. It is represented as
`\Delta H`.

In an endothermic reaction, the energy of products are higher than the reactants energy. Thus, the change in enthalpy is positive.

In an exothermic reaction, the energy of products are lesser than the reactants energy. Thus, the change in enthalpy is negative.

Hence, the correct option is, the reaction is endothermic and the products have a higher AH than the reactants.

Answer 2

The reaction is endothermic and the products have a higher AH than the reactants

Step-by-step explanation:

In an endothermic reaction, heat is absorbed from the surroundings and the surrounding becomes colder at the end of the changes. Here ΔH is assigned a positive sign as the heat energy level of the final state(products) is higher than that of the initial state(reactants).

We see from the curve that the products are at a much higher enthalpy compared with the reactants.