AP Chemistry | 2.4 Structure of Metals and Alloys Day Quiz

Which of the following diagrams best depicts an alloy of Ni and B?

A) [Diagram shows large white circles with smaller gray circles in-between the large white circles]

Steel is an alloy containing Fe atoms and C atoms. Which of the following diagrams best represents the particle-level structure of steel?

B) [Diagram shows large, white circles representing Fe atoms and small, gray circles representing C atoms in the gaps of the Fe atoms]

Copper atoms and zinc atoms have the same atomic radius, 135 picometers. Based on this information, which of the following diagrams best represents an alloy containing only copper and zinc atoms?

B) [Diagram shows many white circles with a few gray circles, representing atoms; both circles are the same size]

To make Au stronger and harder, it is often alloyed with other metals, such as Cu and Ag. Consider two alloys, one of Au and Cu and one of Au and Ag, each with the same mole fraction of Au. If the Au/Cu alloy is harder than the Au/Ag alloy, then which of the following is the best explanation based on the information in the table above?

C) Cu atoms are smaller than Ag atoms, thus they interfere more with the displacement of atoms in the alloy.

A particle-level diagram of a metallic element is shown above. Typically, metals are both malleable and ductile. The best explanation for these properties is that the electrons involved in bonding among metal atoms are

C) equally shared and form nondirectional bonds