Question

write difference between physical change and chemical change​

Answer 1

Answer:

A physical change is a change to the physical—as opposed to chemical—properties of a substance. They are usually reversible. The physical properties of a substance include such characteristics as shape (volume and size), color, texture, flexibility, density, and mass.and chemical change is Chemistry. a usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance: The formation of rust on iron is a chemical change.

physical is reversed and chemical change is not

Answer 2

Answer: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 example of physical change is 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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