Q2 of 68 Page 30

What makes a glass different from a solid such as quartz? Under what conditions quartz could be converted into glass?

It is the arrangement of constituent particles of glass which makes it different from quartz. The constituent particles of glass have short range order while quartz has constituent particles in long range order both by heating and cooling rapidly can be converted into glass.

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24

What type of substances would make better permanent magnets, ferromagnetic or ferromagnetic? Justify your answer.

 1

Define the term 'amorphous'. Give a few examples of amorphous solids.

 3

Classify each of the following solids as ionic, metallic, molecular, network (covalent) or amorphous.

(i) Tetra phosphorus decoxide (P4O10) (vii) Graphite


(ii) Ammonium phosphate (NH4)3PO4 (viii) Brass


(iii) SiC (ix) Rb


(iv) I2 (x) LiBr


(v) P4 (xi) Si


(vi) Plastic

 4

What is meant by the term 'coordination number'?