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Spontaneity
Chapter Name : Thermodynamics
Sub Topic Code : 102_11_06_06_02
Topic Name : Spontaneity
Sub Topic Name : Entropy And Spontaneity
Introduction

• One can think of entropy as a measure of the degree of randomness or disorder in the system. • The greater the disorder in an isolated system, the higher is the entropy. • In a chemical reaction, this entropy change can be seen in the rearrangement of atoms or ions from one pattern in the reactants to another (in the products).

Pre-Requisites:

Enthalpy, reaction

Activity:

Tossing a bag of coins.

Real Life Question:

How do products form when reactants come in contact?

Key Words / FlashCards
Key Words Definitions (pref. in our own words)
Spontaneous reaction • A spontaneous reaction is one which occurs immediately when contact is made between the reactants.
Learning aids / Gadgets
Gadgets How it can be used
Tossing a bag of coins The coins will toss up and then will fall randomly showing disorder
Real life uses :

Tossing a bag of coins.

Places to visit :

Room.

Practical examples around us
Examples Explainations
Tossing a bag of coins There is higher probability that the coins would fall in different ways and not one on top of each other- high disorder.
What you learn in Theory:

• The greater the disorder in an isolated system, the higher is the entropy. • In a chemical reaction, this entropy change can be seen in the rearrangement of atoms or ions from one pattern in the reactants to another (in the products).

What you learn in Practice:

For a given substance, the crystalline solid state is the state of lowest entropy (most ordered), The gaseous state is state of highest entropy.

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