
(a)
Interpretation:
Whether the freezing of water is an exothermic or endothermic is to be determined.
Concept introduction:
The internal energy of a process is the summation of the kinetic energy and potential energy associated with the process. In the case of a reaction, the change in internal energy
In the case of a reaction, the change in enthalpy
Here,
Endothermic reactions are the reactions in which energy in the form of the heat or light is absorbed by the reactant for the formation of product.
Exothermic reactions are the reactions in which energy in the form of the heat or light is released with the product.
(a)

Answer to Problem 6.19P
The freezing of water is an exothermic process.
Explanation of Solution
Freezing of water means the conversion of liquid form of water to solid form. The heat is released in the conversion to solid form.
Exothermic reactions are the reactions in which energy in the form of the heat or light is released with the product.
(b)
Interpretation:
Whether the boiling of water is an exothermic or endothermic is to be determined.
Concept introduction:
The internal energy of a process is the summation of the kinetic energy and potential energy associated with the process. In the case of a reaction, the change in internal energy
In the case of a reaction, the change in enthalpy
Here,
Endothermic reactions are the reactions in which energy in the form of the heat or light is absorbed by the reactant for the formation of product.
Exothermic reactions are the reactions in which energy in the form of the heat or light is released with the product.
(b)

Answer to Problem 6.19P
The boiling of water is an endothermic process.
Explanation of Solution
The boiling of water means the conversion of liquid form of water to gaseous form. The heat is absorbed in the conversion to gaseous form.
Endothermic reactions are the reactions in which energy in the form of the heat or light is absorbed by the reactant for the formation of product.
(c)
Interpretation:
Whether the digestion of food is an exothermic or endothermic is to be determined.
Concept introduction:
The internal energy of a process is the summation of the kinetic energy and potential energy associated with the process. In the case of a reaction, the change in internal energy
In the case of a reaction, the change in enthalpy
Here,
Endothermic reactions are the reactions in which energy in the form of the heat or light is absorbed by the reactant for the formation of product.
Exothermic reactions are the reactions in which energy in the form of the heat or light is released with the product.
(c)

Answer to Problem 6.19P
The digestion of food is an exothermic process.
Explanation of Solution
The digestion of food involves breakage of the food by the body. The energy is released in the process of breaking.
Exothermic reactions are the reactions in which energy in the form of the heat or light is released with the product.
(d)
Interpretation:
Whether the running of person is an exothermic or endothermic is to be determined.
Concept introduction:
The internal energy of a process is the summation of the kinetic energy and potential energy associated with the process. In the case of a reaction, the change in internal energy
In the case of a reaction, the change in enthalpy
Here,
Endothermic reactions are the reactions in which energy in the form of the heat or light is absorbed by the reactant for the formation of product.
Exothermic reactions are the reactions in which energy in the form of the heat or light is released with the product.
(d)

Answer to Problem 6.19P
The running of person is an exothermic process.
Explanation of Solution
When a person runs heat is released from the body as the muscles perform work to run.
Exothermic reactions are the reactions in which energy in the form of the heat or light is released with the product.
(e)
Interpretation:
Whether the growing of person is an exothermic or endothermic is to be determined.
Concept introduction:
The internal energy of a process is the summation of the kinetic energy and potential energy associated with the process. In the case of a reaction, the change in internal energy
In the case of a reaction, the change in enthalpy
Here,
Endothermic reactions are the reactions in which energy in the form of the heat or light is absorbed by the reactant for the formation of product.
Exothermic reactions are the reactions in which energy in the form of the heat or light is released with the product.
(e)

Answer to Problem 6.19P
The growing of person is an endothermic process.
Explanation of Solution
When a person grows it consums food to perform functions of body. The food calories is converted to tissues present in body so energy is consumed.
Endothermic reactions are the reactions in which energy in the form of the heat or light is absorbed by the reactant for the formation of product.
(f)
Interpretation:
Whether the chopping of wood is an exothermic or endothermic is to be determined.
Concept introduction:
The internal energy of a process is the summation of the kinetic energy and potential energy associated with the process. In the case of a reaction, the change in internal energy
In the case of a reaction, the change in enthalpy
Here,
Endothermic reactions are the reactions in which energy in the form of the heat or light is absorbed by the reactant for the formation of product.
Exothermic reactions are the reactions in which energy in the form of the heat or light is released with the product.
(f)

Answer to Problem 6.19P
The chopping of wood is an endothermic process.
Explanation of Solution
Chopping of wood requires energy as the work is done to chop the wood. Mechanical work is done in chhoping so theheat is absorbed.
Endothermic reactions are the reactions in which energy in the form of the heat or light is absorbed by the reactant for the formation of product.
(g)
Interpretation:
Whether the heating with a furnace is an exothermic or endothermic is to be determined.
Concept introduction:
The internal energy of a process is the summation of the kinetic energy and potential energy associated with the process. In the case of a reaction, the change in internal energy
In the case of a reaction, the change in enthalpy
Here,
Endothermic reactions are the reactions in which energy in the form of the heat or light is absorbed by the reactant for the formation of product.
Exothermic reactions are the reactions in which energy in the form of the heat or light is released with the product.
(g)

Answer to Problem 6.19P
The heating with a furnace is an exothermic process.
Explanation of Solution
The heating of the furnance release heat as the temperature of the system increases. The temperature increase due to the reaction in furnance releases energy to the surrounding.
Exothermic reactions are the reactions in which energy in the form of the heat or light is released with the product.
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Chapter 6 Solutions
Chemistry: The Molecular Nature of Matter and Change - Standalone book
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