Question

What are physical changes and chemical changes ?

Answer 1

heloo .......


dear.... ^_^

There are several differences between a physical and chemical change in matter or substances. A physical change in a substance doesn't changewhat the substance is. In a chemical change where there is a chemicalreaction, a new substance is formed and energy is either given off or absorbed..




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Answer 2

$\boxed{\boxed {\boxed{\color {purple}Hello \:Dear\:Students}}}$

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$\boxed{Physical \:Changes :}$ Those changes in which only physical properties of the substance change but no new substances are formed are called physical changes. Physical Changes temporary and hence can be reversed.

$\boxed{Examples:-}$

● Melting of ice to form water and freezing of water to form ice.

● Boiling of water to form steam and condensation of steam to form water.

● Glowing of a bulb

● Breaking of glass tumbler.( this cannot be reversed but still considered as a physical changes because no new substances are formed )

● Tearing of Paper .



$\boxed{Chemical\: Changes :}$ Those changes in which new substances are formed are called chemical changes. Chemical Changes are permanent and hence cannot be reversible.

$\boxed{Examples:-}$

● Burning of magnesium ribbon .
( 2Mg + O2 -> 2MgO)

● Burning of Hydrogen in air .
( 2H2 + O2 -> 2H2O)

● Rusting of Iron
( 2Fe + O2 -> 2FeO)

● Formation iron sulphide from iron and sulphate.

● Burning of Paper .


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Hope this helps. . . . .