List the various types of homogeneous and heterogeneous mixtures with examples.

4

(a)

Give the distinguishing feature of a pure substance or a compound and a mixture.

4

(a)

(a)State the difference between a pure substance and a mixture.Give one example of each.
(b) Identify homogeneous mixture from the following:
(i) smoke
(ii) brass
(iii) tincture of iodine  
(iv) milk

4

(a)

(a)Compare true solution, suspension and colloidal in terms of:
(i) filterability 
(ii) stability
(b) List two factors which bring about a change in the state of matters say, gas to liquid.

4

(a)

Give below is the list of some colloids. Make a list selecting them on the basis of type, dispersing medium. Also give the nature of dispersed phase in each.
Fog, cloud, shaving cream, milk, face cream, milk of magnesia, foam rubber, sponge, jelly, cheese, butter, paint, writing ink, smoke, blood, coloured gemstone.

4

(a)

How are colloidal, solution and suspension different from each other?

4

(a)

State the principle used in separating different components of a mixture by the method of centrifugation.List any two application of this method.

4

(a)

Write any three difference between a physical change and a chemical change.

4

(a)

Distinguish between metals and non-metals.

4

(a)

Write three main difference between a mixture and a compound.

4

(a)