Chapter 19, Problem 130A

Interpretation Introduction

Interpretation : The endothermic process is to be identified.

Concept Introduction : Endothermic process refers to a chemical reaction in which the reactants absorb energy from their environment to create products.

Answer to Problem 130A

The endothermic process are evaporating water (b), melting wax (c), and roasting a marshmallow (d).

Explanation of Solution

Such endothermic reactions absorb heat from the environment, keeping the system where the reaction is occurring colder.

Burning wax is an exothermic process because it involves heating.

Evaporation of water is an endothermic process where heat is absorbed.

Melting wax is an endothermic process since heat is absorbed.

Roasting a marshmallow is an endothermic process since heat is going to the system.