Chapter 12 New materials with chemistry

Which of the following metals is not an alloy?

• bronze

• steel

• sterling silver

• zinc

Because it is lightweight, many alloys used in airplane manufacture include the element _________.

• aluminum

• copper

• lead

• chromium

Which of these is a property of ceramics?

• electrical conductivity

• malleability

• good heat insulator

• chemical reactivity chemical reactivity

The purpose of the impurity in the doped semiconductor is to _________.

• improved the strength of the material.

• reduce production costs

• increase the density of the crystal.

• control conductivity. control conductivity.

The doped crystal in this illustration is an(n) __________.

• n-type semiconductor

• alloy

• integrated circuit

• p-type semiconductor p-type semiconductor

Which of the following is not a property of most plastics?

• light weight

• electrical conductivity

• chemical resistance

• waterproof waterproof

The fiberglass used in manufacturing boat hulls is an example of a(n) _________

• alloy

• ceramic

• polymer

• composite

Which of the following can be made by placing n-type and p-type semiconductors together?

• ceramics

• alloys

• transistor

• composite

Which of these elements is used to dope silicon crystals?

• arsenic

• iron

• chlorine

• copper

Synthetic fibers, such as nylon, are all _________.

• alloys

• ceramics

• composites

• polymers