This video lecture from Thermochemistry (F.Sc. Chemistry Book 1) covers the concept of spontaneous reaction, reason why they are carried out on their own, examples, non spontaneous reactions with examples and reasons why only energy change cannot predict the type of reaction and involvement of free energy. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.