Matric IEB Chemistry: Energy Rates and Rate of Reactions

, Exothermic and Endothermic reactions


Thermodynamics study of
energy or heat transfer
during chemical recutions .




* Chemical the th
reactions are classified as exothermic or endothermic on
grounds of
energy changes
occur
during the reaction.
Increase temperature of the
surroundings
Exothermic Reaction ·




* SAGS

Reactions which transform chemical potential energy into thermal
energy.
a
Dcercase temperature
o



Endothermic Reaction :
* SAGS

Reactions which transform thermal into chemical
potential energy
energy


The
*
Enthalpy chemical
total amount of chemical potential energy
in a
system .




Energyduring demical reaction iseither abobed
a or releasee



Emeatants
Enthalpy Eproducts
The Heat of a reaction It is
* SAGS
the not chemical potential
·


change of
energy
of the .
system

H g ·
Enclothermic Reaction

Ho ·
Exothermic Reaction


Breaking and forming of bonds
During chemical reactions existing ,
bonds in reactants are broken and new bonds are formed to
create products.
be the form
Energy absorbed can in of heat,
light or electrical
energy.
Endobhermic

To Break Bonds) Attractive forces between particles must be and is absorbed
overcome
energy
Fi Bonds/
To
Energy is release


Bond
Energy/ Energy necessary
to break one mol of molecules of a
compound into
separate atores