Energy required to break hydrogen molecules is
105 k Cal / mol
104 k Cal / mol
103 k Cal / mol
107 k Cal / mol
Every substance is associated with a definite amount of energy called
Bond energy
Internal energy
Enthalpy
Entropy
An example for endothermic reaction
formation of ammonia
photosynthesis
formation of SO3
formation of water
The energy required to break a bond is called
bond energy
bond dissociation energy
bond dissipation
bond enthalpy
Formation of ammonia is a
exothermic
endothermic
combustion
displacement reaction
The energy released when a new bond is formed is called
For exothermic reaction, ΔH is
Zero
Positive
Negative
One
Molecules react with oxygen in air to provide heat, light and smoke. This reaction is
Exothermic
Endothermic
Combustion
Displacement
A chemical reaction in which heat is liberated is called
exothermic reactions
endothermic reactions
decomposition
combination
The value of internal energy depends on
nature of bond
nature of molecules
chemical structure and state of substance
