Enthalpy Change ∆H Of A Reaction - Reaction Enthalpy
Chapter Name : Thermodynamics |
Sub Topic Code : 102_11_06_04_01 |
Topic Name : Enthalpy Change ∆H Of A Reaction - Reaction Enthalpy |
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Sub Topic Name : Enthalpy Change ∆H Of A Reaction - Reaction Enthalpy |
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Introduction
• This enthalpy change accompanying a chemical reaction is called the reaction enthalpy(?rH). • ?rH = Total enthalpy of products – Total enthalpy of reactants. • Enthalpy change helps find the amount of heat liberated by chemical reactions.
Pre-Requisites:
• Thermodynamic terms • The state of a system • Enthalpy
Activity:
The heat liberated during burning of fuel.
Real Life Question:
How to calculate enthalpy change associated with a chemical reaction?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Enthalpy | It is same as energy at low and moderate pressure. |
| Reaction enthalpy | The enthalpy change accompanying a chemical reaction. |
| Endothermic reaction | Chemical reaction in which heat is consumed or absorbed. ?rH = +ve. |
| Exothermic reaction | Chemical reaction where heat is liberated. ?rH = -ve. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Cars | Cars work on the energy liberated by burning of petrol. |
Real life uses :
Calculating reaction enthalpy helps in finding: - The heating or cooling is required to maintain an industrial chemical reaction or process at constant temperature. - The amount of heat liberated by burning fuels.
Places to visit :
Home.
Practical examples around us
| Examples | Explainations |
|---|---|
| Cars | They are run on using enthalpy change that takes place during burning of petrol. |
What you learn in Theory:
How to calculate reaction enthalpy.
What you learn in Practice:
Uses of calculating reaction enthalpy.