CHEMISTRY · Single correct · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures
Problem
A solid sample is examined by X-ray diffraction. The detector records discrete, sharp spots that remain fixed as the sample is rotated. Which classification is most consistent with these data?
(a) An amorphous solid lacking long-range order.
(b) A crystalline solid exhibiting long-range lattice order.
(c) A liquid-crystal mesophase possessing only short-range order.
(d) A randomly oriented polycrystalline powder that produces concentric diffraction rings.