Question

12.(a)when two substances A and B are powdered together in a pestle and mortar, a large amount
of heat is evolved. As a result, a new substance C is formed? What is the nature of the new
substance?
(b) Can we separate a mixture of water and alcohol by use of separating funnel? If not
suggest a suitable method.

Answer 1

(a) When two substances are powdered together in mortar and pestle a large amount
of heat is evolved which shows that the new
substance is STABLE than A and B because
of which heat is produced.The substance will
be LESS REACTIVE than A and B

(b) We CANNOT separate the mixture of alcohol and water by use of separating
funnel because both are completly soluable
into each other due to HYDROGEN BONDING

they can be separated by DISTILLATION
in which alcohol has less boiling point(78.5C°)
than water(100C°) which distill earlier leaving
behind the water.

Answer 2

(a) When two substances are powdered together in mortar and pestle a large amount

of heat is evolved which shows that the new

substance is STABLE than A and B because

of which heat is produced.The substance will

be LESS REACTIVE than A and B

(b) We CANNOT separate the mixture of alcohol and water by use of separating

funnel because both are completly soluable

into each other due to HYDROGEN BONDING

they can be separated by DISTILLATION

in which alcohol has less boiling point(78.5C°)

than water(100C°) which distill earlier leaving

behind the water.

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