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Physical and Chemical Changes CHEMISTRY - Physical and Chemical Changes

ICSE - STD 8 - CHEMISTRY (ICSE - English Medium). 31 questions in this chapter.

Question types

Physical and Chemical Changes question types

31 questions across 6 question groups — pick any mix to generate a CHEMISTRY paper with step-by-step answer keys.

31
Questions
6
Question groups
5
Question types
Sample Questions

Physical and Chemical Changes questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 11[3 Mark Question Answer]3 Marks
Give a reason why $-$
$(a)$ Heating a platinum wire is a reversible change but, heating a magnesium wire is an irreversible change.
$(b)$ Addition of zinc nitrate to water is a physical change but, addition of zinc to dilute nitric acid is a chemical change.
$(c)$ Rusting of iron is a chemical change but, magnetization of iron is a physical change.
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Q 12[3 Mark Question Answer]3 Marks
State which of the following terms connected with change of state of matter Le. $–$
$(a)$ Melting
$(b)$ Vaporisation
$(c)$ Condensation
$(d)$ Freezing $–$ pertain to $–$
$(i)$ Conversion of a liquid into a vapour or gas
$(ii)$ Conversion of a liquid into a solid.
$(iii)$ Conversion of a solid into a liquid on heating.
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Q 14[3 Mark Question Answer]3 Marks
State which of the following pertain to $–$ chemical changes.
$(a)$ Substance retains its identity
$(b)$ The change is permanent
$(c)$ No new substance is formed
$(d)$ Is easily reversible
$(e)$ Produces one or more new substances by change in its composition
$(f)$ The change is temporary
$(g)$ The composition and properties of the original substance are not altered.
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Q 15[5 Mark Question Answer]4 Marks
Select the chemical changes from the following list of changes $–$
$(a)$ Vaporisation of water into water vapour.
$(b)$ Boiling of milk.
$(c)$ Respiration in mammals.
$(d)$ Rotting of eggs.
$(e)$ Drying of a fruit.
$(f)$ The carbon cycle.
$(g)$ Occurrence of lightening.
$(h)$ Breaking of glass.
$(i)$ Butter turning rancid.
$(j)$ Glowing of an electric bulb.
$(k)$ Crystallisation of a salt from its solution.
$(l)$ Change of seasons.
$(m)$ Preparation of carbon dioxide from calcium carbonate & dilute hydrochloric acid.
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Q 16[5 Mark Question Answer]4 Marks
Potassium chloride is added to water and stirred. A salt solution is obtained which is then boiled leaving behind a residue.
$(a)$ Is the above change physical or chemical
$(b)$ Name the residue which remains behind after the salt solution is boiled.
$(c)$ Is the change reversible or not reversible.
$(d)$ Are the composition and properties of the original substance altered.
$(e)$ Give a reason why the above experimentation would not be possible, if calcium carbonate is taken, in place of potassium chloride.
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Q 22Match The Following.4 Marks
List $I$ List $II$
$1.$ Burning of paper $A:$ Physical change
$2.$ Ringing of an electric bell $B:$ Chemical change
$3.$ Curdling of milk  
$4.$ An electric light is switched on  
   
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