Chemical and Physical Changes

Chemical and Physical Changesgasoline burning (water vapor and carbon dioxide form)

iron rusting (iron oxide forms)

bread rising (yeast converts carbohydrates into carbon dioxide gas)

eggs cooking (fluid protein molecules uncoil and crosslink to form a network)

suntanning (vitamin D and melanin is produced) 

milk souring (sour-tasting lactic acid is produced)

Physical change rearranges molecules however does not affect their inner structures. Some physical change are:

whipping egg whites (air is pressured into the liquid, but no new substance is made)

magnetizing a compass needle (there is realignment of groups of iron atoms, however no real change in the iron atoms themselves). 

Examples of Chemical and Physical Changes

A chemical change generates a fresh substance, although a physical change will not. A material may change forms or shapes while going through a physical change, however no chemical reactions take place and no new compounds are created.

Examples of Physical Changes

melting an ice cube

crumpling a sheet of paper

breaking a bottle

casting silver in a mold

Examples of Chemical Changes

dissolving salt in water

burning wood

digesting food

mixing acid and base

In some instances, it may be difficult to tell whether a physical or chemical change happened. For example, whenever you dissolve sugar in water, a physical change takes place. The form of the sugar changes, but it stays the same chemically. However, whenever you dissolve salt in water the salt dissociates into its ions therefore a chemical change occurs.

List of Chemical and Physical Changes

The changes could be of two kinds, chemical changes and physical changes.

Physical Changes:

Physical changes are changes within the physical properties of substances for example size, shape, colour and state of substances. No new substances are created in these changes.

Melting of ice, folding of paper and boiling of water are a few of the examples of physical change.

Physical changes could be reversible.

Chemical Changes:

A change where a number of new substances are created is referred to as a chemical change. A chemical change is also known as a chemical reaction. All new substances are created as a result of chemical changes.

Cooking of food, burning of paper and rusting of iron articles are a few of the examples of chemical change.

Chemical changes are always irreversible

Here is the List of Chemical and Physical Changes:

Chemical Changes:

spoiled food

baking a cake,

smelling different types of food

Burning firewood is also considered chemical changes.

Physical Changes:

melting an ice cube,

crushing a can,

mixing sand and water,

boiling water

dissolving sugar

breaking a glass

shredding paper,


mixing red and green marbles. 

chopping wood


Rusting is actually a chemical change that impacts iron articles and gradually destroys them.

The procedure of rusting is symbolized by the following equation:

Iron (Fe) + Oxygen (O2 from the air) + water (H2O) ——-> Rust (iron oxide Fe2O3)

For rusting, the existence of both water (or water vapour) and oxygen is important.

Methods of Avoiding Rusting:




The operation of depositing a layer of zinc upon iron is known as galvanisation.


Crystallisation is a physical change where large crystals of genuine substances are created from their solutions.

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