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

(i) Tetra phosphorous decoxide (P₄O₁₀)

(ii) Ammonium phosphate (NH₄)₃PO₄

(iii) SiC

(iv) I₂

(v) P₄

(vi) Plastic

(vii) Graphite

(viii) Brass

(ix) Rb

(x) LiBr

(xi) Si

Solution:

(i) Tetra phosphorous decoxide (P₄O₁₀) - Molecular

(ii) Ammonium phosphate (NH₄)₃PO₄ – Ionic

(iii) SiC - Covalent (network)

(iv) I₂ - Molecular

(v) P₄ - Molecular

(vi) Plastic - Amorphous

(vii) Graphite – Covalent (network)

(viii) Brass - Metallic

(ix) Rb - Metallic

(x) LiBr - Ionic

(xi) Si – Covalent (network)

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

What is the co-ordination number of atoms:
(i) in a cubic close packed structure?
(ii) in a body centred cubic structure?

What is meant by the term ‘coordination number’?

(ii) What is the coordination number of atoms:

(a) in a cubic close-packed structure?

(b) in a body-centred cubic structure?

Define the term ‘amorphous’. Give a few examples of amorphous solids.

The Solid State