Interpretation:
Whether the conversion of A to B is an exothermic reaction or endothermic reaction should be identified on increase in equilibrium concentration of B.
Concept Introduction:
A chemical equilibrium shifted towards forward direction or backward direction depends on the concentration of both reactant and products.
Exothermic reaction:
A
Endothermic reaction:
A chemical reaction in which energy is added when reactant converted into products known as endothermic reaction.
Temperature effect:
In a reaction, reactant molecule collides with each other and many bonds are break and formed in this process; all this process depend on the kinetic energy of molecules and as we increase the temperature the kinetic energy also increases as a result
Consider and equilibrium reaction:
Here, a, b, c and d are coefficient.
If we add excess concentration of c and d, then the chemical equilibrium will shifted in backward direction.

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Chapter 7 Solutions
EP INTRO.TO GENERAL,ORGANIC...-OWL ACCE
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