Match the items of column-I to those of column –II. column-I column-II (i) Burning of Magnesium (P) Tincture iodine (ii) Melting of ICE (Q) Chemical change (iii) Solution (R) Emulsion (iv) Milk(colloid) (S) ) Physical change
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Answer:
(i) - Q, (ii)- S, (iii)- P, (iv)- R
Explanation:
Burning of magnesium is a chemical reaction as magnesium combines chemically with oxygen to form magnesium oxide.
Melting of ice is physical change.(no new product formed)
Tincture of iodine is a solution of iodine and alcohol.
Milk is an Emulsion.( liquid in liquid- type colloid)
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The correct match is given below -
(i) Burning of Magnesium (Q) Chemical change
(ii) Melting of ICE (S) Physical change
(iii) Solution (P) Tincture iodine
(iv) Milk(colloid) (R) Emulsion
- Physical change is associated with changes in the physical properties of object. Here reversible changes take place and the composition remains the same.
- Chemical changes involve the production of new products with different compositions. They are irreversible.
- The emulsion is the mixing of two or more than two liquids that are not soluble with each other.
- The solution is a homogenous mixture comprised of two or more than two substances.
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