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