C2 -bonding,structure And Properties Of Matter Flashcards
What is ionic bonding?
Transfer of electrons
What shows how ionic bonds are formed?
Dot and cross diagrams
What is the structure of an ionic compound
Regular lattice
What is covalent bonding?
Sharing electrons
What are the three different ways of drawing covalent bonds
Dot and cross
Formula
3d model
What are polymers
Long chains of repeating units
What are the three giant covalent structures
Diamond
Silicon dioxide
Graphite
What are the allotropes of carbon
Diamond
Graphite
Graphene
Fullerene
Properties of diamond
Four covalent bonds
Very hard
High mp
Doesn’t conduct electricity
Properties of graphite
Three covalent bonds
Hexagons
High mp
Conducts electricity and thermal energy
Soft and slippery
Properties of graphene
Hexagon
Very strong
Light
Conducts electricity
Properties of fullerenes
Hollow ball
Hexagons,pentagons or heptagons
Huge surface area
What are the three states of matter
Solid ,liquid and gas
Properties of a solid
Regular lattice
Doesn’t move
Particles vibrate
Fixed positions
Strong force of attraction
Properties of liquids
Weak force of attraction
Free to move
Close together
Don’t keep definite shape
Properties of gases
Very weak
Free to move
Far apart
Don’t keep definite shape or volume
How do substances change from one state to another
Solid - liquid = melting
Liquid - gas = boiling
Gas - liquid = condensing
Liquid to solid = freezing
Explain why graphite conducts electricity
It has delocalised electrons which carries an electrical charge through structure
Why is steel harder than iron
Carbon atoms are different sizes to iron atoms
Carbon atoms distort the layers of iron atoms
Therefore layers cannot slide
What type of reaction happens at the negative electrode and give reason for answer
Reduction
H+ ions gain electrons
Why would mass of a substance be different without a lid on a crucible
Products will escape
Mass of substance will be less
What is formula of buckminsterfullerene
C60
