For each of the following pairs of materials, decide which has the larger thermal conductivity. Justify your

Question:

For each of the following pairs of materials, decide which has the larger thermal conductivity. Justify your choices.
(a)Pure silver; sterling silver (92.5 wt% Ag-7.5 wt% Cu)
(b) Fused silica; polycrystalline silica
(c) Linear and syndiotactic poly (vinyl chloride) (DP = 1000); linear and syndiotactic polystyrene (DP = 1000)
(d) Atactic polypropylene (Mw = 106 g/mol); isotactic polypropylene (Mw = 105g/mol)