Chapter 19.3, Problem 23R

To determine

Todescribe: the reaction which is to be chosen to develop a product that warms people’s hands.

Explanation of Solution

Introduction:

If the reaction is carried by using the external energy is called endothermic reaction. In this reaction, energy absorbs as heat from it surrounding.

The reaction is shown below:

Reactant + Heat $\to$ Product

If heat is realeased in the form of thermal enegy, then the reaction is called exothermic reaction.

Reactant $\to$ Product + Heat

Therefore, the product that warms the people hand means, the reaction is exothermic reaction.

Conclusion:

Hence,exothermic reaction helps to develop a product that warms hand.