Heating of iron rod to red hot is a:
(a) Chemical change
(b) Physical change
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Heating of iron rod to red color is a chemical change as it can again come back from red to its normal color after being cooled....
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(a) Evaporation of petrol is a physical change because no new chemical substance is formed. (b) Burning of LPG is a chemical change because on burning, LPG forms CO2and H2O. (c) Heating of an iron rod to red hot is a physical change. (d) Curdling of milk is a chemical change because in the conversion of milk to curd, new chemical substances are formed. (e) It is a physical change, because solidvapours and no new chemical substance is formed.
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