Enthalpy Change ∆H Of A Reaction - Reaction Enthalpy
Chapter Name : Thermodynamics |
Sub Topic Code : 102_11_06_04_05 |
Topic Name : Enthalpy Change ∆H Of A Reaction - Reaction Enthalpy |
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Sub Topic Name : Thermochemical Equations |
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Introduction
·
Any balanced chemical reaction along with its enthalpy is
called as a thermochemical reaction.
·
The stochiometric
coefficients of a reaction represent the number of moles of each component.
·
The numerical value of ?rH?
depends on the number of moles of substances specified by an equation.
·
When a chemical equation is
reversed, the value of ?rH? is reversed in sign.
Pre-Requisites:
·
Thermodynamic
terms
·
The state of a
system
·
Enthalpy
Activity:
All reactions ex: burning of glucose in our body
during respiration is an exothermic reaction having a specific enthalpy
Real Life Question:
What are the rules
governing standard reaction enthalpy?
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 |
| Thermochemical reactions | Any chemical reaction along with its standard enthalpy is called as a thermochemical reaction. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| The burning of a motor fuel | A motor fuel such as petrol is a reaction which has its enthalpy |
Real life uses :
A thermochemical equation gives the exact idea of how
much reactants are required to give the desired product and whether energy will
be released or absorbed.
Places to visit :
Practical examples around us
| Examples | Explainations |
|---|---|
| Respiration | All reactions ex: burning of glucose in our body during respiration is an exothermic reaction having a specific enthalpy |
What you learn in Theory:
Rules governing the calculation
of standard reaction enthalpy.
What you learn in Practice:
Each reaction has an
enthalpy value.