Year 9 Term 3 Flashcards
Structure of a metal
Outer electrons become delocalised, forms positive ions and delocalised electrons
Why is a metal malleable
Because there are layers of atoms that can slide over each other into new positions without breaking its metallic bond
Why do metals conduct heat and electricity
Because it has a delocalised electron that can carry a charge
Why are metals ductile
Because there are layers of atoms that can slide over each other into new positions without breaking its metallic bond
Pure metal
Atoms can slide over each other
Soft
Densely packed
Alloys
Different size atoms
Hard
Difficult for atoms to slide over each other
Distorted shape
What happens when you add more atoms to an alloy
It becomes more brittle
What are smart alloys
They are metals that remember their original shape under certain conditions
What is a monomer
Small molecule that had a double bond
What’s a polymer
A large chain molecule that has a single bond
What does ‘poly’ mean
Many
What is graphene
It comes from graphite and is made up of a layer of carbon atoms which are tightly bound in the shape of hexagons.
Why can graphene conduct electricity
Each carbon atom is bonded to three other carbon atoms leaving a delocalised that can carry a charge
What would it be called if there was another layer of carbon atoms?
Graphite
What is a fullerene
It’s a molecule of carbon atoms that are arranged in cages and tubes each with a different number of carbon atoms
