Differentiate physical and chemical change

Answer 1

A physical change is reversible or temporary and a chemical change is permanent.

Chemical change is a change that imply modifications in the structures of molecules; new compounds appear.

Ex.: burning of coal with releasing of carbon dioxide and water.

Physical changes don't imply the structure modification of the molecules but only the state of matter, form, dimensions; the chemical compound remain unchanged.

Ex.: grinding of coal to be used in a thermal power unit.

Answer 2

Physical change-

A Physical change is when you change the appearance of an object, but you don't change it's makeup or substance.

For e.g. , When we freeze water to ice, after heating, we can get the water back.

***********Cooling***************

Water ------------------------------------> Ice

***********Heating***************

Ice ------------------------------------> Water

Chemical change-

A Chemical change is when you change it into one or more new substances with different properties that the old one. The process can not be reversed.

For e.g. , burning of wood produces smoke, carbon-di-oxide, carbon-monoxide, ash, heat, sulphur-di-oxide, Carbon Dioxide, oxides of nitrogen and sulphur, mamozono, kalazone, poopeos, germies and valavonies.

******************************Smoke

******************************Carbon-Di-Oxide

******************************Carbon-Monoxide

******************************Ash

******************************Heat

************Burning************Carbon-Di-Oxide

Wood ------------------------------------> *Oxides of Nitrogen and Sulphur

******************************Mamozono

******************************Kalazone

******************************Poopeos

******************************Germies

******************************Sulphur-Di-Oxide

******************************Valavonies

Answer 3

physical change:when substance undergoes a change without forming a new substance is called a physical change.

chemical change:if a substance undergoes a change and forms a new substance,it is called a chemical change