Physical Change And Chemical Change

 

Physical and Chemical Changes

A matter is anything that has mass and occupies space. It is made up of tiny particles and has physical and chemical properties. Physical properties of matter include its appearance and observable properties. Some physical properties are color, odor, taste, solubility, rigidity, fluidity, melting and boiling points, etc. A chemical property is a property exhibited during a chemical reaction. This includes pH, reactivity, inflammability, etc. Let’s learn about Physical and Chemical Changes, how they are related to physical and chemical properties.

Everything around us undergoes certain changes. Changes can be either physical or chemical.

Physical change

When matter changes it observable properties, we can say it has undergone a physical change.  Physical change is a type of change where the physical properties of matter change. A change of state of matter, change in color, odor, solubility, etc. all are examples of physical change.  During a physical change, neither the composition nor the chemical nature of matter is changed.  During this change, molecules rearrange themselves without affecting the internal composition. A physical change doesn’t affect the chemical property.

A common example of physical change is the conversion of states of water.  Ice, water, and steam are the three physical states of water. But all the three forms contain H2O. Other examples are whipping egg albumin, crushing of tomato, breaking of a bar magnet, etc.

Physical and Chemical Changes

Chemical change

Different substances have different chemical property. According to this property, substances show variation in their reactivity.

Chemical change is a type of change where the chemical properties of matter change. It is commonly called a chemical reaction. A chemical reaction results in a new product. During a chemical change, bonds between the molecules break and the composition of the substance change. In other words, chemical change leads to the breaking and making of bonds. Combustion, rusting, fermentation, etc. are few examples of chemical change.

Chemical Change

The following table shows major differences between a physical and chemical change.

PHYSICAL CHANGE CHEMICAL CHANGE
Change in physical property Change in physical and chemical property
Reversible process Irreversible process
Energy is neither absorbed nor evolved Energy is either absorbed or evolved
No new product formation New product is formed

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Practise This Question

We observe that some portion of wax (in candle) melts and other portion of it is used in producing heat and light.
Statement A: The melting of wax is a physical change
Statement B: The burning of wax for the production of heat and light is a chemical change.
State which of the statement(s) is/are true.