Q10. a.List three properties of mixtures. (3)
b.Why are objects at a distance seen more clearly after rain ? (1)
c.The process of adding alum to water to hasten sedimentation is called loading.Why has
this name been given to the process?
Answers
Answer:
A)The components of a mixture each keep their original properties.
The separation of components can be easily done.
The proportion of the components is variable.
B) When it rains, the dust particles in the air get wet and settle down on the ground. As a result, the air is clearer after it rains and objects at a distance are seen more clearly.
C)The process of adding alum to water to hasten sedimentation is called 'loading'. Why has this name been given to the process? ANSWER:When alum is added to water, it dissolves in water and makes the. suspended impurities heavier making them settle down quickly. Therefore, the addition of alum is known as loading.
Q10. a) Properties of mixture are :-
i) It consists of two or more substances (elements or compounds or both) mixed together physically.
ii) It does not have any fixed composition.
iii) The components of mixture retain their properties.
b. When it rains the dust particles in the air get wet and settle down on the ground. As a result, the air is clear after it rains and objects at a distance seen more clearly .
c) When alum is added to water, it dissolves in water and make the suspended impurities heavier making them settle down quickly. Therefore, the addition of alum in water is known as loading.