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We are living in a world where so many changes are taking place.In chemsitry we can categorise the changes into two
1)Physical change
2)Chemical change

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Temporary in nature.

Does not affect the internal structure of a substance, only the molecules are rearranged.

No new substance is formed.

Most of the physical changes are reversible. We can obtain the substance back even after the change.

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1.A new substance is formed.

2.It is a permanent change.

3.The composition of new substance changes.

4.It is irreversible.

5.Heat or light evolved or absorbed during change.

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Lead II Nitrate Reaction With Potassium Iodide - Pb(NO3)2 + KI

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Evolution of a gas (formation of bubbles)

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Evolution of a gas (formation of bubbles)

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Reaction Of Zinc  with Hydrochloric acid | Chemistry demonstration

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North Carolina School of Science and Mathematics

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Double Displacement Sodium Sulfate and Barium Chloride

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Chemical Reaction: Change in Temperature

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Burning Of Magnesium Ribbon Experiment | Chemistry Demo | Grade 7-12

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CHARACTERISTIC FEATURES OF A CHEMICAL CHANGE

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CHARACTERISTIC FEATURES OF A CHEMICAL CHANGE

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1. Color Change.

2. Production of an odor.

3. Change of Temperature.

4. Evolution of a gas (formation of bubbles)

5. Precipitate (formation of a solid)

6. Change in physical state