Chemistry
Classify the following as a physical or a chemical change:
(a) Drying of wet clothes.
(b) Curdling of milk.
(c) Butter getting rancid.
(d) Boiling of water
(e) Burning of paper
(f) Melting of wax
(g) Burning of coal
(h) Formation of clouds
(i) Rusting of iron
(j) Roasting of potatoes
(k) Formation of alloys
(l) Making of a sugar solution
(m) Glowing of an electric bulb
(n) Manufacture of salt from sea water.
Phy & Chem Changes
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Answer
(a) Drying of wet clothes — Physical change
(b) Curdling of milk — Chemical change
(c) Butter getting rancid — Chemical change
(d) Boiling of water — Physical change
(e) Burning of paper — Chemical change
(f) Melting of wax — Physical change
(g) Burning of coal — Chemical change
(h) Formation of clouds — Physical change
(i) Rusting of iron — Chemical change
(j) Roasting of potatoes — Chemical change
(k) Formation of alloys — Physical change
(l) Making of a sugar solution — Physical change
(m) Glowing of an electric bulb — Physical change
(n) Manufacture of salt from sea water — Physical change
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Related Questions
Name the following:
(a) The solid formed when vapours of a sublimable substance cool down.
(b) The compound formed when magnesium burns in air.
Write true or false against the following statements and correct the false ones.
(a) Heating of an iron rod is a chemical change.
(b) Condensation of steam is not a chemical change.
(c) Rusting of iron is a fast change.
(d) A physical change is reversible.
(e) There is a change in the mass of a substance in a physical change.
Give one example of the following changes:
(a) Natural, non-periodic change
(b) Natural, periodic change
(c) Irreversible, physical change
(d) A chemical change in which energy is absorbed.
(e) A man-made fast change.
(f) A process in which both physical and chemical changes take place simultaneously.
Define:
(a) a physical change
(b) a chemical change