One of the basic concepts of science we have studied is changes in matter. There are two types of changes, physical and chemical changes. The preliminary chapters help students understand the basic difference between these two changes. In this section, we will understand what are chemical changes and their characteristics. This concept page defining the examples of chemical change has been formatted by the experts of Vedantu for the benefit of the students. Here, you will find the best definition of chemical change along with 20 examples of chemical changes. In a chemical change, the chemical nature of the reactants totally changes to form new substances developing new chemical and physical traits. The composition and decomposition of substances in a chemical change will be properly defined so that the students of all merit levels can easily grab the concept and carry on studying the chapter without any hassle.
We observe different changes in the form of substances in nature. Not all changes are permanent. The temporary changes where the chemical properties of a substance do not change are called physical changes. Now let us move to the part of chemical changes.
A chemical change is where the reactants are chemically altered to form new substances at the end of a reaction. Let us take a quick look at the characteristics of a chemical change before we head to the 20 examples of chemical changes.
The molecular composition of the changes in the reactant(s) as they form new substances that are totally different from the parent compounds.
A change in temperature is also noticed in a chemical reaction as the molecules break into atoms or groups of atoms to form new compounds. Either energy is released or absorbed in a chemical change. When energy is released, it is called an exothermic chemical reaction. When energy is absorbed, it is called an endothermic reaction.
A chemical change is permanent. It means that the newly formed substances cannot be easily changed back to the parent compounds by simply changing the physical conditions of a reaction. Hence, a chemical change is irreversible or permanent.
There is a change in the mass of the reactants in a chemical change. Either mass is subtracted or added to form new substances with new properties.
Now that you have understood what a chemical change is and its specific properties, you can easily identify the changes in an example. When ice melts to form water, it is a physical change as the chemical properties of water are not altered. In fact, water can be cooled down to form ice again very easily. When water reacts with an alkaline metal, it forms a base, and hydrogen is released. You can see that the reactants, water, and alkaline metal, do not exist in the product. The products, on the other hand, are entirely new substances that vary from the reactants.
Once you study 5 examples of chemical change in an elaborate way, you can easily find out the differences between physical and chemical change. In fact, you will also be able to relate to the properties of a chemical change mentioned above. Follow this page to understand this concept properly and use it to develop your basic knowledge of chemical reactions.
Let us consider a few more examples of chemical change in the next section.
Once you have understood what is the definition of chemical change, you can proceed to the example section. This section will help you find out 20 examples of chemical change.
Rusting of iron in presence of moisture and oxygen
Burning of wood
Milk becoming curd
Formation of caramel from sugar by heating
Baking of cookies and cakes
Cooking any food
Digestion of food
Boiling an egg
Ripening of fruits
Rotting of food
Lighting a matchstick
Formation of cheese from milk
Burning of candles
The chemical changes involving inorganic compounds show distinct changes in the constituency of the final products in terms of state, colour, etc. The chemical nature of the products will be entirely different from that of the reactants. You will learn these features elaborately in the related chapter.
1. What is the difference between a physical and chemical change?
Physical changes do not produce new chemically-different products whereas chemical changes result in newly formed substances. If you give an example of chemical change and a physical change, you will easily understand.
2. Why should I study 10 examples of a chemical change?
In this concept, you will find multiple examples of chemical changes. If you study these examples, you will easily understand the properties of a chemical change. These examples also come as questions in the exams.
3. Do chemical changes occur in organic compounds?
Yes. You will find a plethora of examples related to chemical changes involving organic compounds on this concept page. You will also find many examples in the chapters in the textbook. Find out how organic compounds react and form new substances.