Which separation techniques will you apply for the separation of the following?
Small pieces of metal in the engine oil of a car.
Centrifugation or sedimentation
Classify the following as chemical or physical changes:
(i) cutting of trees.
(ii) melting of butter in a pan.
(iii) rusting of almirah.
(iv) boiling of water to form steam.
(v) passing of electric current, through water and the water breaking down into hydrogen and oxygen gases.
(vi) dissolving common salt in water.
(vii) making a fruit salad with raw fruits, and
(viii) burning of paper and wood.
(i) Cutting of tree is a physical change.
(ii) Melting of butter in a pan is a physical change.
(iii) Rusting of almirah is a chemical change.
(iv) Boiling of water to form steam is a physical change.
(v) Passing of electric current through water and the water breaking down into hydrogen and oxygen gases is a chemical change.
(vi) Dissolving common salt in water is a physical change.
(vii) Making a fruit salad with raw fruits is a physical change.
(viii) Burning of paper and wood is a chemical change.
Which separation techniques will you apply for the separation of the following?
Ammonium chloride from a mixture containing sodium chloride and ammonium chloride.
Sublimation
Which separation techniques will you apply for the separation of the following?
Different pigments from an extract of flower petals.
Chromatography
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