4. Classify the following as chemical and physical changes.
(b) Heating platinum
(d) Drying of clothes
(e) Mixing of iron nails and sand
() Burning of methane
nrnnerties of a colloidal
(a) Cooking of food
(c) Freezing of water
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Answer:
Physical changes are the changes in which only the state changes of an object , no new substance is formed .
Chemical changes are the changes in which a new substance is formed , and cannot get back to its original form .
Explanation:
(a) Chemical change
(b) Physical change
(c) Physical change
(d) Physical change
(e) Physical change
(f) {Burning of methane} Chemical change
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