Question

distinguish between physical change and chemical change.​

Answer 1

Answer:

Physical changes -

• The changes in which the properties of the substance changes physically.
• These changes can be reversed.
• No new substance is formed in these type of changes.
• The molecules of the substance remain exactly the same before and after the change.  

• They are temporary changes.

Example ::

→ Melting of Ice

→ Freezing of water

→ Tearing of paper

Chemical Changes -

• The changes in which the properties of the substance changes chemically.
• These changes cannot be reversed.
• A new substance is formed in these type of changes.
• Chemical reaction takes place in these type of changes.  
• The molecules of the substance changes and it is not easy to get back the original substances.  
• They are permanent changes

Example ::

→ Burning of paper

→ Growth in plants

→ Rusting of Iron

_______________

Answer 2

Physical Change

• When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged.

• Physical change is a temporary change.

• A Physical change affects only physical properties i.e. shape, size, etc.

• A physical change involves very little to no absorption of energy.

• Some examples of physical change are freezing of water, melting of wax, boiling of water, etc.

• Generally, physical changes do not involve the production of energy.

• In a physical change, no new substance is formed

• Physical change is easily reversible i.e original substance can be recovered.

Chemical Change

• When a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances

• A chemical change is a permanent change

• Chemical change both physical and chemical properties of the substance including its composition

• During a chemical reaction, absorption and evolution of energy take place

• A few examples of chemical change are digestion of food, burning of coal, rusting, etc.

• Chemical changes usually involve the production of energy (which can be in the form of heat, light, sound, etc.)

• A chemical change is always accompanied by one or more new substance(s).

• Chemical changes are irreversible i.e. original substance cannot be recovered.

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