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Chemical energy
Form of potential energy
This potential energy lies within chemical
bonds
The chemical bonds are the forces of attraction
that bind together atoms within a compound
When bonds are broken, energy is needed
When bonds are formed, energy is released
In chemical reactions, therefore, the chemical
energy of the atoms change…read more

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Enthalpy
This is the heat content stored in a chemical
system
Impossible to measure directly
However, it is possible to measure the energy
that is exchange with the surrounding during a
chemical reaction
This energy can vary from heat, light, sound etc…read more

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Conservation of energy
Energy is conserved ­ it is never destroyed
This means that the heat that is lost from a
chemical system is the same amount as the
energy that is gained by the surroundings i.e.
The energy is just transferred, but not lost
This is the law of conservation of energy…read more

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Enthalpy change
In some reactions, the products have more
chemical energy than the reactants, whilst in
other reactions, the reactants have more
energy than the products
Enthalpy change is:
The heat that is exchanged with the
surroundings during a chemical reaction at a
constant pressure
The difference between the enthalpy of the
products and the enthalpy of the reactants…read more

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Enthalpy change
When the enthalpy of the reactants is greater
than the enthalpy of the products, heat is
gained by the surroundings, and so the
reaction is EXOTHERMIC
When the enthalpy of the reactants is smaller
than the enthalpy of the products, heat is
gained to the chemical system from the
surroundings, and so the reaction is
ENDOTHERMIC…read more

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