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CHANGES

CHANGES TAKING PLACE AROUND US

DAY AND NIGHT CHANGESMILK BECOMES CURDDECAY OF VEGETABLESRUSTING OF IRONRAININGSUN RISES

CHANGE IN PHYSICAL STATES

MELTING OF ICE BOILING OF WATER

Discussion points

• WHAT DO YOU OBSERVE IN THE PHYSICAL STATES?

• DID THEY CHANGE?• WHAT DO YOU UNDERSTAND?

SOLID STATE CHANGES TO LIQUID STATE IN THE FIRST CASE.

IN THE SECOND CASE LIQUID CHANGES TO GASEOUS STATE

IN BOTH THE CASES THERE OCCURS

A PHYSICAL CHANGE

Discussion points

• WHAT HAPPENS WHEN AN IRON NAIL IS LEFT AS SUCH FOR LONG TIME?

Here Chemical Change Occurred.IRON RUSTS

CLASSIFY THESE INTO PHYSICAL AND CHEMICAL CHANGES

MELTING OF WAXEVAPORATION OF WATERCRACKING OF FIREWORKSDIGESTION OF FOODBURNING OF FIREWOODCONVERSION OF RICE TO BOILED

RICERUSTING OF IRON

PHYSICAL AND CHEMICAL CHANGES

ACTIVITY

• WHEN A TEASPOONFUL OF SALT IN WATER IS DISSOLVED,COMMON SALT SOLUTION IS FORMED.

IS THERE ANY FORMATION OF NEW

SUBSTANCES?

NEW SUBSTANCES ARE FORMED IN CHEMICAL

CHANGES

BURNING OF CANDLEBURNING OF WICK AND GASEOUS WAX IS AN EXAMPLE OF PHYSICAL CHANGE.

NO NEW SUBSTANCES ARE FORMED IN PHYSICAL CHANGES

• CHEMICAL CHANGE

REVIEWDifferentiate Between Physical

and Chemical Changes

FOLLOW UP ACTIVITYLIST OUT 10 EXAMPLES FROM EACH OF

PHYSICAL AND CHEMICAL CHANGES

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