Theory:

We heard about a few physical properties of matter in the previous chapter.
 
Physical properties can be observed and defined, such as colour, hardness, rigidity, fluidity, density, melting point, boiling point, etc.
Physical changes: It occurs without a change in structure or the material's chemical nature; interconversion of states is an example of  physical change.
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While ice, water, and water vapour have distinct appearances and physical properties, they are chemically identical.
 
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Water and cooking oil are both liquids, but their chemical properties vary.
 
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Oil catches fire
  
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Water used to put off the fire.
 
They have distinct odours and are more flammable. Oil burns in the air while water extinguishes fuel. It is oil's chemical property that separates it from water.
Chemical changes are nothing but the change in the chemical properties of matter, resulting in the creation of new substances. A chemical reaction is another word for a chemical change.
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Paper turns into ash.
  
Burning is a chemical transformation. During this step, one material interacts with another, resulting in a chemical shift.