What is physical and chemical change?
Everything around us undergoes some change or the other. Change is called the order of nature. Some changes happened that can be noticed by normal eyes. However there are few changes that happen due to the chemical reactions that takes place. So, we often come across two kinds of changes, one is physical change and the other is chemical change.
Every element in this environment is made up of matter. So anything or everything that occupies some space and has some mass often tends to undergo certain changes. Usually these types of changes are harmless.
The process where we can notice that the matter havechanged its observable properties is known as a physical change. It can range from anything like change of state of matter, change in color, solubility etc.
In the process of a physical change, neither the composition nor the chemical nature of the matter gets affected. In this kind of a change, the molecules tend to rearrange themselves without affecting the internal composition of the matter. It does not have any effect on the chemical properties of the matter.
Examples: ice Turing into water under normal temperature, melting of the chocolate
This process is defined as the change in the material into another. This often leads to the formation of a new material with completely different properties. This change in the metal can lead to formation of one or more new materials.
This type of a change often occurs when a substance combines with other substances to form a new substance. This often happens with the application of synthesis or decomposition. One of the common examples is the oxidation process.
These kinds of reactions are generally irreversible. Few other examples are chemical reaction that develops the dye in the color and creates a chemical change in the hair. There are primarily three types of chemical changes namely organic, inorganic and the biochemical change.
Chemical changes always happen around us all the time and it is not only a phenomenon in the chemistry lab. Few of the chemical change examples in our everyday life are mentioned below.
- Burning of paper and burning of log
- Digestion process of food.
- Boiling of egg
- Battery use
- Bakingof a cake
- Milk turning sour
- The different types of metabolic reaction taking place in the cell
- Rotting of fruits
There aremany differences that can be pointed out between the physical and chemical changes. So, this is important that we should understand both the process clearly. A very brief comparison between the two is given below that will help the students gather the basic differences between the two processes.
Differences between Physical and Chemical Change
|Physical Change||Chemical Change|
|When a substance undergoes a physical change, the composition of the material remains the same despite the fact thatthe molecules getrearranged.||When a substance undergoes a chemical change, the molecular composition gets changed entirely. This process often involves the formation of new substances.|
|Physical change can often be refined as a temporary change.||A chemical change is a permanent one and often irreversible change.|
|When there is a Physical change that affects only physical properties for example shape, size, etc.||When there is a Chemical change both physical and chemical properties of the substance change. It includes both the physical properties and the chemical ones.|
|When there is a physical changethey may be a little to no absorption of energy.||During a chemical reaction, there is a huge absorption and evolution of energy thattake place.|
|Few of the examples of physical change are freezing of water, melting of chocolate , boiling of water, etc.||Coming to a few examples of chemical change, it includes digestion of food, rusting of iron, rotting of fruits , etc.|
|In general during a physicalthere is negligible production of energy||In this case, chemical changes usually involve the production of energy. There can be different forms of energy that get transmitted during this change.|
|In a physical change, there is no formation of a new substance.||In a chemical change since one substance reacts with the other, there is always a formation of a new substance.|
|Physical change is an easily reversible process that means the original substance can be recovered.||Chemical changes are irreversible since new substances are formed so there is no scope to revive the original substance.|
Both these changes are however important for the environment because they bring in the required balance. The chemical change however is commonly used in the formation of new substance and also in the production of energy.