Physical change Chemical change A change in matter is called a physical change if A chemical change is a change where a the molecular composition of the substance chemical reaction may happen or the remains the same, however, a deformation of Lsubstance undergoes chemical modification the object may take place The identity of the constituent particles remain. A new product is always obtained. in tact. Examples: melting of wax, sugar dissolves in Examples:. Rusting of Iron, All forms of coffee, steam condenses into liquid water, etc. combustion (burning), food being cooked, digested, or rotting, etc. Physical change Chemical change A change in matter is called a physical change if A chemical change is a change where a the molecular composition of the substance chemical reaction may happen or the remains the same, however, a deformation of Lsubstance undergoes chemical modification the object may take place The identity of the constituent particles remain. A new product is always obtained. in tact. Examples: melting of wax, sugar dissolves in Examples:. Rusting of Iron, All forms of coffee, steam condenses into liquid water, etc. combustion (burning), food being cooked, digested, or rotting, etc