Plz find answer for this 3 questions
Q.6. Aarushi's mother always squeezes water from wet clothes in the spinner of washing machine and then uses it to clean the floor.
(a) Write the principle of the technique used in the above mentioned process.
(b) Write one more application of this technique.
(c) What do you learn from Aarushi's mother? (Board 2013, Set-OAHJD6N) (3)
Ans. ....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Q.7. (a) State any one difference pure and impure substances.
(b) What will you observe when :
(i) Carbon disulphide is added to the compound iron sulphide ?
(ii) Dil. hydrochloric acid is added to a mixture of iron filings and sulphur powder.
(Board 2012, Set-042) (3)
Ans. ..............................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Q.8. (a) List any three characteristics of colloid.
(b) Identify colloid from the following mixtures :
Muddy water, Sugar in water, Ink, Blood, Soda water, Foam.
(Board 2013, Set-OAHJD6N; Board 2012, Set-021) (5)
Ans. ....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
6)
a)The centrifuge works using the sedimentation principle, where the centripetal acceleration causes denser substances and particles to move outward in the radial direction. ... Medium-sized centrifuges are used in washing machines and at some swimming pools to wring water out of fabrics.
b) it is used to separate cream from milk.
c) she has good knowledge of chemistry.
7)
a)pure substance is natrually occuring substance. eg diamond,gold etc.
impure substance is man made. eg. water,salt etc.
b)
c)
8)
a)colloids show persistance of suspension, tyndal effect, brownian motion
b)muddy water,ink,blood,foam
i dont know the 7)b answer. kindly get the answer form somebody else.
hope it helps
a)The centrifuge works using the sedimentation principle, where the centripetal acceleration causes denser substances and particles to move outward in the radial direction. ... Medium-sized centrifuges are used in washing machines and at some swimming pools to wring water out of fabrics.
b) it is used to separate cream from milk.
c) she has good knowledge of chemistry.
7)
a)pure substance is natrually occuring substance. eg diamond,gold etc.
impure substance is man made. eg. water,salt etc.
b)
c)
8)
a)colloids show persistance of suspension, tyndal effect, brownian motion
b)muddy water,ink,blood,foam
i dont know the 7)b answer. kindly get the answer form somebody else.
hope it helps