Question
Which pair of statements about diamond and graphite is correct?
A. Diamond and graphite are both pure carbon. They are both macromolecules.
B. Diamond and graphite can both be used as electrodes. Graphite is also used as a lubricant.
C. Diamond has covalent bonds. Graphite has ionic bonds.
D. Diamond is hard with a high melting point. Graphite is soft with a low melting point.
Answer/Explanation
Ans:
A
Question
Which diagram represents the structure of silicon(IV) oxide?
Answer/Explanation
Ans: D
Question
The arrangement of particles in each of two solids, S and T, are shown.
Answer/Explanation
Ans: B