Question

Classify each of the following as a physical or chemical change . Give reason . (a) Drying of a shirt in the sun. (b) Rising of hot air over a radiator. (c) Buring of kerosence in a lantern . (d) Change in the colour of black tea on adding lemon juice in it.

Answer 1

HEYA USER ,
Here is your answer !!

(a) Drying of a shirt in the sun is a PHYSICAL change .

(b) Rising of hot air over a radiator is a PHYSICAL change .

(c) Buring of kerosence in a lantern is a CHEMICAL change .

(d) Change in the colour of black tea on adding lemon juice in it is a CHEMICAL change .

Hope it helps you !!

Answer 2

Hey mate !!

here is your answer !!!

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physical change :-

physical change is a type of change in which no new substance are formed physical property maybe change .

for example :- H20(l) ----heat -------> H20 (g)

H20 (l) ---cool ----- H20 (s) .



now ,

chemical change:-

chemical change is a type of change in which new substance are formed.

physical as well as chemical properties change.


for example:- rusting of iron


digestion of food.

etc



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your answer ;-


a) drying of shirt in Sun:-

it is a physical change because no new substance is formed.

just, water is goes into other form


b) rising of hot air over a radiator:-

it is a physical change because no new substance is formed when the air is hot after sometimes it cools so it is a physical change.




c) burning of kerosene:-


burning of kerosene is a type of chemical change because new substance is formed and there is a combustion reaction.




d) change in the colour of black tea on adding lemon juice:-

it is a type of chemical change because on adding the lemon juice in black tea its colour become change


new substance get formed so it is a chemical change.



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hope it helps Dear !!


thanks !!