SUBMITTED BY;SIPRASUBHADARSHINI JENA

ROLL NO-21(SC)

SUBHASHREE BEHERA

ROLL NO-22(SC)

OBJECTIVESAfter the completion of the class , the student

• States physical and chemical changes.

• Explains physical and chemical changes.

• Differentiates between them.

• Gives the examples of both the changes

INTRODUCTION• What type of changes you know in

your surrounding?

• On the basis of changing identity how many types of changes are there?

PHYSICAL CHANGE

IN PHYSICAL CHANGE THE SUBSTANCES NEVER CHANGE THEIR IDENTITY.

IT MAY CHANGE

-ITS PHYSICAL STATE

-TASTE

-SHAPE/SIZE

-POSITION

CHANGE IN PHYSICAL STATE

1-Water to vapour

2-Dring of clothes

3-Boiling of milk

4-Melting of butter

5-Melting of ice cream

MAKING SOLUTION

1-DISSOLUTION OF SUGAR INTO WATER

2-SALT INTO WATER

CHANGE IN SHAPE/SIZE

1-CUTTING OF PAPER/CLOTH

2-BREAKING OF GLASS/PLASTIC/PLATE

3-MAKING PAPER BOAT

4-BREAKING OF PENCIL

5-STRETCHING OF RUBBER

6-DRAWING A WIRE OF IRON

7-HAMMERING OF IRON INTO THIN SHEETS

CHANGE IN POSITION

1-LIFTING OF TABLE

2-FILLING A GLASS WITH ORANGE JUICE

GRINDING OF A SUBSTANCE

1-CUMIN TO CUMIN POWDER

2-WHEAT TO FLOOR

CHARACTERISTICS OF PHYSICAL CHANGE

1-NO NEW SUBSTANCES ARE FORMED

2-THESE CHANGES ARE REVERSIBLE/TEMPORARY IN NATURE.

WHICH CHANGE IS THIS?

WHICH CHANGE IS THIS?

• New substances are formed which are completely different than the original one.

• Sound may be produced

• Heat and light may be given off or absorbed.

• A new smell may be given off.

• A permanent change in colour may take place.

• It is generally irreversible.

PHYSICAL AND CHEMICAL CHANGES

COMPARISIONPHYSICAL CHANGE• New substances are formed

which are completely different than the original one.

• These changes are reversible/temporary in nature,

CHEMICAL CHANGE• New substances are formed

which are completely different than the original one.

• Sound may be produced

• Heat and light may be given off or absorbed.

• A new smell may be given off.

• A permanent change in colour may take place.

• It is generally irreversible.

EVALUATION1-Which changes are physical changes?

(a)Melting of iron metal

(b)Breaking of glass

(c)Ripening of banana

2-which of the following is not a characteristics of a physical change?

(a)No new substances are formed

(b)Can be reversed

(c) Permanate change

3-Define chemical change.

4-Differentiate between physical and chemical change.

HOME ASSIGNMENT

LIST OUT 10 MORE EXAMPLES OF PHYSICAL AND CHEMICAL CHANGES.