Question

Which of the following is true about endothermic reactions? The change in enthalpy is positive and the reactants contain more energy than the products. The change in enthalpy is negative and the reactants contain more energy than the products. The change in enthalpy is positive and the reactants contain less energy than the products. The change in enthalpy is negative and the reactants contain less energy than the products. The change in enthalpy is positive and the reactants contain as much energy as the products.

Answer 1

Since in endothermic reactions the reactants need heat (positive value):

The change in enthalpy is positive and the reactants contain more energy than the products. (A.)

Answer 2

The change in enthalpy is positive and the reactants contain more energy than the products.

Step-by-step explanation:

Energy is absorbed in an endothermic process and energy is released in an exothermic process. The enthalpy change or delta H is positive in an endothermic reaction and delta H is negative in an endothermic reaction.

In an endothermic reaction as energy is absorbed by the reactants the reactants contain more energy than the products. In an exothermic reaction as energy is released the products contain more energy than the reactants.