The burning of the matchstick is a chemical change that undergoes the combustion process and hence it is permanent. When the milk gets sour and converted into curd, the process could not be reversed and hence it is a chemical change. Once you mead the dough and make a chapati out of it, it is a chemical change.Īs the surface of iron comes in contact with oxygen, it forms a layer of rust(iron oxide) leading to a chemical change. Although his rust can be removed by following some chemical reactions but altogether rusting or corrosion is a chemical change. Here, this rusting of iron is an irreversible chemical change that forms a new product where the reactants lose their properties. Here the iron and air or moisture acts as the reactants which when comes in contact reacts and leads to the formation of a new product which is an iron oxide or as called rust. Rust is an oxide of iron, which is a product formed when the iron surface is exposed to air. Hence, this is how the physical and chemical reactions occur and make a difference. On the other hand, if we combine water with any alkaline metal, then the reaction leads to the formation of some new components which are completely different from the reactant substances. So if we take a look at this, then this change is a change in the physical appearance of the water, hence it is a physical change. The physical form of the water changed from liquid to solid. Water can easily help us understand when the reaction is physical and when is it chemical.įor instance, when we take water in a glass and keep it frozen, it converts into ice.
Some of the chemical change examples are curd getting sour, wooden burning in presence of oxygen, etc.īut the easiest example to understand the difference between physical and chemical change is water. Although the chemical changes can be reversed it requires intense chemical reactions to do so. These chemical changes lead to many changes which tell us that a chemical change has occurred like, the composition of those substances changes, the reaction while occurring may produce heat or absorb heat( exothermic or endothermic process), the reaction or the change which has happened is irreversible, then also the change is a chemical change. When one or more substances combine chemically in such a way that a new substance is formed, then that change is considered to be the chemical change. The physical changes are reversible and do not provide any formation of a new substance, while the chemical changes are those reactions that form new substances and the substance loses its existence. These changes are classified into two categories which are physical and chemical changes. Changes can be observed in our surroundings in our daily life.
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