How to Calculate Change in Entropy br br Join our amazing group of charismatic chemistry comrades at br br The Second Law of Thermodynamics says that the universe is moving toward increasing entropy, or disorder. br br 00:10 Second Law of Thermodynamics br 00:30 How to predict the change in entropy br 02:30 Sign of Entropy br 02:55 Predict Sign of Entropy Change Practice br 04:37 How to Calculate Change in Entropy Practice Problem br br In chemistry, we talk about entropy in terms of chemical reactions. Chemical reactions that result in an increase in entropy are thermodynamically favored, whereas those that result in a decrease in entropy are not. In this video, I teach you how to calculate change in entropy in a reaction. br br When you calculate change in entropy, a positive change in entropy means entropy is increasing, and a negative change in entropy means entropy is decreasing. A positive change in entropy is thermodynamically favored.