Unit 1 : Topic 3 - Structures Flashcards
What are the properties of a Giant Ionic Lattice?
- Crystalline - soluble
- Brittle - breaks easily
- high melting point
- conducts electricity (only when a liquid)
- soluble in water
What are the properties of a Covalent Molecular?
- Low melting point
- Low boiling point
- Doesn’t conduct electricity
- not very soluble in water
- soft when solid
What are examples of Giant Covalent’s?
- Diamond
- Graphite
- Graphene
What are allotropes?
Different forms of the same element but in the same physical state.
What are the properties of Diamond?
- Very high melting point
- Very high boiling point
- Doesn’t conduct electricity
- Insoluble in water
- Is extremely hard
Why don’t graphite and graphene conduct electricity?
They don’t have any delocalised electrons.
What are the properties of a Graphite?
- A slippery and soft solid
- High melting point
What are the properties of Graphene?
- Conducts electricity efficiently
- Conducts heat efficiently
- Is nearly transparent
- Is 100x stronger than steel
- Very thin
- Very light
- Inexpensive
Why don’t some structures conduct electricity?
Because the forces ( Van deer Waals ) are very strong therefore holding the delocalised electrons in place.
What are the properties of a Giant Metallic?
- High melting point
- Dense and Strong
- Conducts electricity
- Conducts heat
- Malleable (able to be hammered into shape)
- Ductile ( can be drawn into wires )
What element are diamonds made out of?
Carbon
What shape is a diamond?
Tetrahedral
What shape is graphite?
Hexagonal
What is an Alloy?
A mixture of 2 or more elements, at least 1 of which is a metal, and the resulting mixture has metallic properties.
What are some examples of alloys?
- Steel is an alloy of iron and carbon.
- White gold is an alloy of gold and silver.
- Rose gold is an alloy of gold and copper.
- Brass is an alloy of copper and zinc.
