wzorowane3 pktotwarteśrednie (szac.)
Discuss the melting points in the table below in terms of the bonding and/or intermolecular forces present in each substance. Substance Melting point / K Silicon dioxide (quartz) 1986 Poly(propene) 433
Covalent network solids and carbon allotropes
Describe the structures of diamond, graphite, graphene, fullerenes, silicon and silicon dioxide, and explain their melting points, hardness, electrical conductivity and other properties in terms of bonding and structure.
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wzorowane1 pktzamkniętełatwe (szac.)
Four allotropes of carbon, labelled W, X, Y and Z, are described in the table. Allotrope Description W a single flat sheet of hexagonal rings, one atom thick, in which each carbon atom is bonded to three others X a closed cage of 60 atoms made of pentagonal…
wzorowane1 pktzamkniętełatwe (szac.)
Which statements about the allotropes of carbon are correct? I. Graphite conducts electricity because each carbon atom contributes one electron to a delocalized system. II. Diamond conducts electricity because it has a covalent network structure. III.…
wzorowane1 pktzamkniętełatwe (szac.)
A solid has a very high melting point, does not conduct electricity when solid or when molten, and is insoluble in water and in non-polar solvents. Which type of structure does the solid have? A. Ionic lattice B. Metallic lattice C. Covalent molecular D.…
wzorowane1 pktzamkniętełatwe (szac.)
Which substance is a good conductor of electricity in the solid state? A. Graphene B. Diamond C. Silicon dioxide D. Silicon