Chemistry
Name the following:
(a) The solid formed when vapours of a sublimable substance cool down.
(b) The compound formed when magnesium burns in air.
Phy & Chem Changes
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Answer
(a) Sublimate
(b) Magnesium Oxide (MgO)
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Related Questions
Fill in the blanks:
(a) The process of a liquid changing into a solid is called …………… .
(b) A change which alters the composition of a substance is known as a …………… change.
(c) There is no change in the …………… of the substance during a physical change.
(d) The reaction in which energy is evolved is called …………… .
(e) The process in which a substance in solid state directly changes into ............... is called sublimation.
Match the following:
Column A Column B (a) Freezing of water (i) Natural change (b) Change of seasons (ii) Chemical change (c) Burning of wood (iii) Physical change (d) Permanent change (iv) Sublimation (e) Heating of solid camphor (v) Fast process 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.
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.