Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692



Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 9, Problem 11E
Textbook Problem

Define each of the following terms:

a. heat

b. energy

c. work

d. system

e. surroundings

f. exothermic reaction

g. endothermic reaction

h. enthalpy of reaction

i. kinetic energy

j. potential energy

Interpretation Introduction


Each of the given terms is to be defined.

Concept Introduction:

Thermodynamic property is a type of property that is defined as a point function. It is the state of a system. Thermodynamic properties do not depend on the path followed.

They are of two types: intensive thermodynamic property, which does not depend on the mass of the system, and intensive thermodynamic property, which depends on the mass of the system.

Explanation of Solution

a) Heat

The shift of tiny particle known as atoms, liquid and gases is responsible for heat energy generation. It can be trasferred from one body to another. Therefore, the movement of substances due to the difference in temperature between two bodies is called heat.

b) Energy

The power generated by utilizing chemical or physical resources for providing heat and light or for carrying out various processes is known as energy. The SI unit of energy is joule. According to the law of conservation of energy, energy can neither be created nor be destroyed, it can be converted to other forms.

c) Work

The force due to which an object moves is known as work. The displacement of an object is also called work. It is scalar product of force, which acts on an object and causes displacement.

d) System

The area in which a reaction occurs is known as a system. The bonds which form or break in the reaction are also part of the system. The system is of two types, closed and open.

e) Surroundings

The area around a reaction is known as the surroundings. It is the area other than the system. The system and surroundings together are known as the universe. The separation of a system from its surroundings is done by a boundary, which can be real or imaginary.

f) Exothermic reaction

An exothermic reaction is a reaction in which energy is released from a chemical reaction in the form of heat...

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Chapter 9 Solutions

Chemistry In Focus
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