Post on 18-Jul-2015
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.