A bronze sample contains tin atoms by number mixed with copper atoms
CHEMISTRY · Single correct · GCSE · Chemistry · Bonding, Structure and the Properties of Matter · Bonding, Structure and the Properties of Matter
Problem
A bronze sample contains 30% tin atoms by number mixed with copper atoms. The atomic radii of Cu and Sn differ by less than 15%. You are asked to sketch a particle-level diagram of a thin 2-D slice of the alloy containing 10 atom sites originally occupied by Cu in the pure metal lattice. Which of the following descriptions identifies the most appropriate way to modify the diagram?
(a) Replace five of the ten Cu atom sites with Sn atoms of the same size chosen at random positions in the lattice.
(b) Remove all Cu atoms from one entire row of the lattice and replace that row with Sn atoms of the same size.
(c) Replace three of the ten Cu atom sites with Sn atoms of the same size chosen at random positions in the lattice.
(d) Insert three Sn atoms that are significantly smaller than Cu into the spaces between the ten Cu atoms without removing any Cu atoms.