C4g-Metal Structure and properties Flashcards Preview

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Flashcards in C4g-Metal Structure and properties Deck (12)
1

Why is iron used to make cars and bridges?

Strong
Malleable

2

Why is copper used to make electrical wiring?

Good conductor of electricity
Easily bent

3

What are the physical properties of metals?

-Lustrous
-Hard
-High density
-High tensile strength
-High melting and boiling points
-good conductor of heat and electricity

4

What properties do you need for a good saucepan?

-good conductor of heat
-doesn't rust easily

5

What properties do you need for a good aeroplane?

-low density(light)
-strong
-doesnt corrode

6

What are the particles in a metal held by?

Particles in a metal are held together by metallic bonds

7

What is metallic bonding?

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

8

Why do metals have high melting points and boiling points?

They have strong metallic bonds which need a lot of energy to break them apart

9

Why do metals conduct electricity?

There is a sea of delocalised electrons which move freely through the metal, carrying the electrical current

10

What is a superconductor?

When you make a metal cold enough and their resistance disappears completely

11

What are the benefits of superconductors?

-transmit electricity without any loss of power
-strong electromagnets don't need a constant power source
-fast electronic circuits because of no resistance

12

What are the disadvantages of superconductors?

Difficult and expensive to get a metal to very cold temperatures