Classify the following as physical change or chemical change. i.Burning of magnesium ribbon in air ii.Burning of sulphur in air iii.Electrolysis of water iv.Purification of copper sulphate from impure copper sulphat by crystallization v.Preparation of sugar solution vi.Conversion of milk into curd vii.Evaporation of alcohol viii.Burning of coal
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Answer:
chemical change
chemical change
chemical change
physical change
physical change
chemical change
physical change
chemical change
Explanation:
i.It forms magnesium oxide
ii.it forms sulphur dioxide
iii.Electric current changes water into two gases, hydrogen and oxygen. iv.Because if we boil the solution we again get copper sulphate and water. v.As no new chemical is formed.
vi. Bacteria converts lactose in milk to lactic acid of curd.
vii.It does not change the substance.
viii.When coal is burnt, carbon changes to carbon dioxide.
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