What happens to some metals when the kinetic energy of their particles is decreased? (1 point)

Question

• They expand.
• They conduct.
• They contract.
• They melt.

Answer 1

• They contract.

Answer 2

Aluminum allows for the flow of electrons, while glass does not. Would an aluminum wire surrounded by glass be an effective design for a device that will need to carry an electric current? (1 point)
• No, it would not. Both aluminum and glass are conductors, so the current would be exposed to outside elements.
• Yes, it would. The glass would carry the current, while aluminum is an insulator.
• No, it would not. Both aluminum and glass are insulators, so the device would not carry a current.
• Yes, it would. Aluminum is a conductor, and the glass would prevent electricity from transferring to a person holding the device.

Answer 3

• No, it would not. Both aluminum and glass are insulators, so the device would not carry a current.

Answer 4

Which material would be a suitable insulator? (1 point)
• gold
• rubber
• silver
• copper

Answer 5

• rubber

Answer 6

An electrician is trying to decide which kind of material to use to wire a house.
• carbon steel: conductivity = 1.43 × 10^-7, resistance = 1 × 10^10
• copper: conductivity = 5.96 × 10^7, resistance = 1.68 × 10^-8
• gold: conductivity = 4.11 × 10^7, resistance = 2.44 × 10^-8
• iron: conductivity = 1 × 10^7, resistance = 1.0 × 10^-7
Based on this information, which material should the electrician use?
(1 point)
• carbon steel
• gold
• iron
• copper

Answer 7

• copper