A student receives three unlabeled crystalline samples and records the following…
CHEMISTRY · Single correct · A Level · Chemistry · Bonding · Bonding
Problem
A student receives three unlabeled crystalline samples and records the following observations:
• Sample X scratches quartz and is an electrical insulator.
• Sample Y leaves a gray mark on paper and conducts electricity only along one crystal axis.
• Sample Z melts at 1135∘C and conducts electricity equally well in all directions.
Which identification of the samples is most reasonable?
(a) Sample X is quartz, Sample Y is diamond, Sample Z is graphite.
(b) Sample X is diamond, Sample Y is graphite, Sample Z is quartz.
(c) Sample X is diamond, Sample Y is graphite, Sample Z is copper.
(d) Sample X is diamond, Sample Y is copper, Sample Z is graphite.