HLEP NOW 5TH GRADE SCIENCE What is the main difference between a chemical and Physical change? Use examples to support your 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.

Physical change is a temporary change.

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

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.

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

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.

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.

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

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Hope this helps

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

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