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During chemical change composition of the matter changes and that change remains permanent.

During physical change only the state of matter changes and this change is often temporary in nature.

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Size reduction of naphtha balls exposed to air.

Identify physical and chemical changes from the Phenomena given below :

Staining of Shahbadi or Kadppa tile by lemon juice.

Breaking of a glass object on falling from a height.

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The composition of matter remains the same.

There is a change  only in physical properties due to change in the parameters such as temperature and pressure.

There is a change in both physical and chemical properties due to chemical reactions taking place in concern matter.

DISTINGUISH BETWEEN PHYSICAL CHANGE AND CHEMICAL CHANGE

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Calcium chloride Calcium chloride (CaCl 2 )

Potassium chromate Potassium chromate (K 2 CrO 4 )

Barium sulphate Barium sulphate (BaSO 4 )

Copper sulphate (CuSO 4 ) Copper sulphate

Sodium carbonate Sodium carbonate (Na 2 CO 3 )

Phthalic  anhydride ‎C 8 H 4 O 3   or  C 6 H 4 (CO) 2 O

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2 .  REACTION  OF ZINC DUST WITH COPPER SULPHATE SOLLUTION

Colour change (if present)  Gas released ( Yes / No) Temperature change  (if present) Activity No 1. Yes Yes Nature of change (Chemical /physical) Chemical

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3 .  REACTION OF POTASSIUM CHROMATE WITH BARIUM SULPHATE

Colour change (if present)  Gas released ( Yes / No) Temperature change  (if present) Activity No 1. Yes Yes Nature of change (Chemical /physical) Chemical Yes 2.  No Yes Chemical

ONLINE CLASSES FOR CLASS 8 TH  TO 10 TH  ARE AVAILABLE FOR ALL SUBJECTS AT JUST 200   PER MONTH PER SUBJECT CONTACT 7218722009/9921123664

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4 .  REACTION OF SODIUM CARBONATE WITH CALCIUM CHLORIDE

Colour change (if present)  Gas released ( Yes / No) Temperature change  (if present) Activity No 1. Yes Yes Nature of change (Chemical /physical) Chemical Yes 2.  No Yes Chemical Chemical Yes 3. No  No

ONLINE CLASSES FOR CLASS 8 TH  TO 10 TH  ARE AVAILABLE FOR ALL SUBJECTS AT JUST 200 PER MONTH PER SUBJECT CONTACT 7218722009/9921123664

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Colour change (if present)  Gas released ( Yes / No) Temperature change  (if present) Activity No 1. Yes Yes Nature of change (Chemical /physical) Chemical Yes 2.  No Yes Chemical Chemical Yes 3. No No No 4. No Yes Chemical

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