An example for endothermic reaction
formation of ammonia
photosynthesis
formation of SO3
formation of water
The reactants used during photosynthesis
H2O & CO2
CO & H2O
O2 & CO2
H2O &H2
Energy required to break one mole of chlorine molecule is
57.8 k cal
55.2 k cal
56 k cal
48 k cal
The value of internal energy depends on
nature of bond
nature of molecules
chemical structure and state of substance
bond energy
A chemical reaction which takeplace with absorption of heat is called
exothermic reactions
endothermic reactions
decomposition reaction
combination
During photosynthesis, plants synthesis one of the following
Carbondioxide
Hydrogen
Starch
Protein
The energy released when a new bond is formed is called
bond enthalpy
bond dissociation energy
bond dissipation
Energy required to break hydrogen molecules is
105 k Cal / mol
104 k Cal / mol
103 k Cal / mol
107 k Cal / mol
For exothermic reaction, ΔH is
Zero
Positive
Negative
One
Formation of NO from N2 and O2 is a
Exothermic
Combustion
Endothermic
Combination
