If you are having problems understating the exothermic reactions then you have come to the right place. You will find that every little change that occurs in nature is actually due to the energy change. Energy is that quantity which takes different forms, and the kind of change is actually triggered by a flow of energy. As a student of chemistry, you will learn about the different kinds of chemical reactions. The chemists have actually found that the exchange of heat is always accompanied by a chemical reaction which can be classified as per the kind of energy or heat change.
The motive force that comes into play in every change that takes place in the universe can be credited to some kind of energy alteration. When you carefully observe the world revolving around you, you will realize that all types of environmental and biological changes that take place can be accredited to the chemical reactions that are powered by the subtle inputs as well as outputs of energy.
Though you may not be clear about the concept of exothermic reaction, you must certainly felt its effect in your day to day life. In simple words, an exothermic reaction is the one that is accompanied with a release of energy. The term 'exo' refers to outside; and 'thermic' means heat. When split in this way, it becomes easier to understand its meaning. The crackling fireplace provides heat, because explosion is an exothermic reaction releasing energy in the type of heat and light.
As you know there are various forms of energy, the emission of energy may make itself evident in the form of heat, light and sound. There are several kinds of chemical reactions in the nature, which are of exothermic character. Each of them is accompanied with a rise in temperature as heat is emitted to the surrounding area.
Since the heat energy is emitted through the chemical reaction, there is a boost to the entropy of the whole system, down with a decline in enthalpy that is associated with it. Nature actually prefers low energy states, and thus the energy release is quite essential in some chemical reactions to achieve stability. Some of the real life examples include combustion of gasoline in the car engines, corrosive reactions such as metal oxidation, burning of any matter in air, rusting of iron and so on. If you are looking for more details then consider hiring a private home tutor.