Question

Write a main difference between a physical and a chemical change ??

Answer 1

Answer:

Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.

Answer 2

$\huge \tt \underline \pink{Question}$

Write a main difference between a physical and a chemical change ?

$\huge \tt \underline \pink{Answer}$

$\sf \purple{Physical \:change \: - }$

• This change is temporary and reversible.

• There is no formation of new product.

• There is no energy change in these changes.

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

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

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

$\sf \purple{Chemical \:change\:-}$

• The change is permanent and irreversible.

• There is a formation of new product.

• There is energy change in these changes.

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

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

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