Identify the physical and chemical changes in the following.
formation of dew.

breaking of glass pane.

rustingof iron.

burning of LPG.

dissolution of sugar in water.

formation of cloud.

melting of wax.

heating of sugar

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Solution

$1 . F o r m a t i o n o f d e w - p h y s i c a l c h a n g e (a s i t i n v o l v e s w i t h t h e c o n d e n s a t i o n o f w a t e r a g a i n i t c a n b e c o n v e r t e d t o w a t e r) 2 . B r e a k i n g o f g l a s s p a n e - p h y s i c a l c h a n g e (d o e s n o t c h a n g e t h e c o m p o s i t i o n o f t h e g l a s s) 3 . R u s t i n g o f i r o n - C h e m i c a l c h a n g e (c o m p o s i t i o n c h a n g e d t o i r o n o x i d e) 4 . B u r n i n g o f L P G - C h e m i c a l c h a n g e (F u e l i s C o n v e r t e d t o C O_{2}) 5 . D i s s o l u t i o n o f s u g a r i n w a t e r - P h y s i c a l c h a n g e (C o m p o s i t i o n d o e s n o t c h a n g e) 6 . F o r m a t i o n o f c l o u d - p h y s i c a l c h a n g e (a s i t i n v o l v e s w i t h t h e c o n d e n s a t i o n o f w a t e r a g a i n i t c a n b e c o n v e r t e d t o w a t e r) 7 . M e l t i n g o f w a x - P h y s i c a l c h a n g e (d o e s n o t c h a n g e t h e c o m p o s i t i o n o f t h e w a x) 8 . H e a t i n g o f s u g a r - C h e m c i a l c h a n g e (c o n v e r t e d t o c h a r r e d m a s s)$

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Question 4

(c) Classify the following processes into physical or chemical changes.
baking of bread, switching of an electric bulb, curdling of milk, dissolving sodium chloride in water, photosynthesis, rusting of iron, evaporation of water, formation of dew, sublimation of camphor, burning of charcoal or LPG, clotting of blood, crystallization of sugar, ripening of fruit, cooking of vegetables, melting of wax.

Classify the following examples into physical or chemical change. [1 MARK]

1) Photosynthesis and burning of coal

2) Dissolving sugar in water and melting of wax

Classify the following as physical and chemical changes:
(i) Making sugar solution
(ii) Cooking chicken
(iii) Formation of clouds
(iv) Making ice candy

Classify these changes into physical and chemical changes. [5 MARKS]

S.No	Change
1	Melting of Ice
2	Dissolving sugar in water
3	Burning rubber
4	Burning camphor
5	Melting Wax

Q. Group the following into physical change and chemical change.

Dissolving salt in

H_{2} O,

burning of a fuel, rusting or iron, melting of ice cube.

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Identify the physical and chemical changes in the following. formation of dew. breaking of glass pane. rustingof iron. burning of LPG. dissolution of sugar in water. formation of cloud. melting of wax. heating of sugar

Identify the physical and chemical changes in the following.
formation of dew.

breaking of glass pane.

rustingof iron.

burning of LPG.

dissolution of sugar in water.

formation of cloud.

melting of wax.

heating of sugar