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Chemistry Module 4 > Metal Structure And Properties > Flashcards

Flashcards in Metal Structure And Properties Deck (13)
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1
Q

Explain why copper is used to make electrical wiring

A

It is a good conductor

2
Q

List the physical properties of metals

A
  • lustrous, hard and high desnsity
  • high tensile strength
  • high melting and boiled points
  • good conductors of heat and electricity
3
Q

What are the particles in a metal held together by?

A

Metallic bonds

4
Q

How can metals becomes superconductors?

A

At low temperatures

5
Q

Why do metals have high melting points and boiling points?

A

Due to strong metallic bonds

6
Q

Describe how metals conduct electricity?

A

The free movement of delocalised electrons allows metals to conduct electricity

7
Q

Describe what is meant by the term superconductor

A

They are metals that are able to conduct electricity because the atoms are very close together and the electrons can move from atom to atom

8
Q

Describe the potential benefits of superconductors

A
  • loss free power transmission
  • super-fast electronic circuits
  • powerful electromagnets
9
Q

Describe metallic bonding

A

The attraction between a sea or delocalised electrons and close packed positive metal ions

10
Q

Explain in terms of structure why metals have high melting points and boiling points

A

Because lots of energy is needed to overcome the strong metallic bonds

11
Q

Explain in terms of structure why metals conduct electricity

A

The electrons are able to move freely which allows the metal to conduct electricity

12
Q

Explain some of the drawbacks of superconductors

A

Most superconductors work below -200°C. This very low temperature is costly to maintain and impractical for large-scale users.

13
Q

Explain why iron is used to make cars and bridges

A

It is very strong