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PHYSICAL AND CHEMICAL CHANGE - Coggle Diagram
PHYSICAL AND CHEMICAL CHANGE
PHYSICAL CHANGE
CHARACTERISTICS
A PHYSICAL CHANGE IS GENERALLY REVERSIBLE. NO NEW SUBSTANCE IS FORMED IN A PHYSICAL CHANGE.
EXAMPLES
MELTING OF ICE.
BOILING OF WATER STRETCHED RUBBER BAND
DEFINITION
A CHANGE IN WHICH A SUBSTANCE UNDERGOES A CHANGE IN ITS PHYSICAL PROPERTIES IS CALLED A PHYSICAL CHANGE.
CHEMICAL CHANGE
CHARACTERISTICS
HEAT, LIGHT OR ANY OTHER RADIATION MAY BE GIVEN OFF OR ABSORBED. SOUND MAY BE PRODUCED. A CHANGE IN SMELL MAY TAKE PLACE. A COLOUR CHANGE MAY TAKE PLACE. A GAS MAY BE FORMED.
EXAMPLES
RUSTING OF IRON. CURDLING OF MILK.
DEFINITION
A CHANGE IN WHICH ONE OR MORE NEW SUBSTANCES ARE FORMED IS CALLED A CHEMICAL CHANGE.
CRYSTALLIZATION
IT IS THE PROCESS OF OBTAINING LARGE CRYSTALS OF PURE SUBSTANCES FROM THEIR SOLUTIONS.
RUSTING OF IRON
THE RED OR ORANGE COATING THAT FORMS ON THE SURFACE OF IRON WHEN IT IS EXPOSED TO AIR AND MOISTURE.
GALVANISATION
THE PROCESS OF DEPOSITING A LAYER OF ZINC ON IRON IS CALLED GALVANISATIUON.
THE IRON PIPES WE USE IN OUR HOMES TO CARRY WATER ARE GALVANISED TO PREVENT RUSTING.