Question

827. Identify the dispersed phase and dispersing medium in the following colloids:
Fog, b) Smoke, c) Shaving crème, d) cheese, e) coloured gem stone, f) Milk of magnesia
228.(1) What are isotopes? write two isotopes of carbon.
(ii) Write any two applications of iisotope​

Answer 1

Fog: dispersed phase is liquid and dispersing medium Is gas

b) smoke: dispersed phase is solid and dispersing medium is gas

c) shaving cream: dispersed phase is gas and dispersing medium is liquid

d) cheese: dispersed phase is liquid and dispersing medium is solid

e) coloured gem stone: dispersed phase is solid and dispersing medium is solid

1) the atoms of the same element have same atomic number and different mass number are known as isotopes.

examples

$c \frac{12}{6}$

$c \frac{14}{6}$

(ii) Applications of isotopes:

• an isotope of Uranium is used as fuel in nuclear reactors .
• An isotope of Cobalt is used in the treatment of cancer.
• An isotope of iodine is used in the treatment of goitre.

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