Question

1.a) Define :
(i) a physical change
(ii) a chemical change

AND GIVE TWO EXAMPLE FOR OF ABOVE
TWO CHANGE

b) Mention a change which is always
(i) desirable
(ii) undesirable
(iii) periodic
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2.a) what do you observe when :
(i) water is boiled,
(ii) a piece of paper is burnt.


b) Name a change which take place in presence of :
(i) Heat (ii) Light (iii) Electricity
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plz say right answer,
can anyone help me,
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Answer 1

Answer:

the change can be reverse is called physical change.

the change cannot be reversed is called chemical change.

Answer 2

Answer:

a.1

in physical changes the object only change it shape and mass occupy by it and the property doesn't change it example:- a dough

but in chemical changes the object totally changed like if we burn a paper the property of the paper will change

b.

i. germination of seed

ii. rusting of iron

iii. day and night

c .2

i. the water start evaporating

ii. when a piece of paper burn entirely new substance like the carbohydrate gas

iii. in this the release of heat chemical reaction take place