MEDIUM
9th CBSE
IMPORTANT
Earn 100

Classify the following as chemical or physical changes:
(a) cutting of trees,
(b) melting of butter in a pan,
(c) rusting of almirah,
(d) boiling of water to form steam,
(e) passing of electric current, through water and the water breaking down into hydrogen and oxygen gases,
(f) dissolving common salt in water,
(g) making a fruit salad with raw fruits, and
(h) burning of paper and wood.

Important Questions on Is Matter Around Us Pure?

MEDIUM
9th CBSE
IMPORTANT
Try segregating the things around you as pure substances or mixtures.
MEDIUM
9th CBSE
IMPORTANT
Which separation technique will you apply for the separation of sodium chloride from its solution in water? (Evaporation/ Filtration/ Centrifugation)
MEDIUM
9th CBSE
IMPORTANT
Which separation technique will you apply for the separation of ammonium chloride from a mixture containing sodium chloride and ammonium chloride?
MEDIUM
9th CBSE
IMPORTANT
Which separation technique will you apply for the separation of small pieces of metal in the engine oil of a car? (Evaporation/ Filtration)
MEDIUM
9th CBSE
IMPORTANT
Which separation technique will you apply for the separation of different pigments from an extract of flower petals?
MEDIUM
9th CBSE
IMPORTANT
Which separation technique will you apply for the separation of butter from curd? (Centrifugation/ Filtration)
MEDIUM
9th CBSE
IMPORTANT
Which separation technique will you apply for the separation of oil from water? (Separating funnel / Distillation)
MEDIUM
9th CBSE
IMPORTANT
Which separation technique will you apply for the separation of tea leaves from tea?