Topic C2 - Bonding, Structure And Properties Of Matter Flashcards
What are ions?
Charged particles made when electrons are transferred
What is ionic bonding?
The electrostatic attraction between oppositely charged ions. Ionic bonding occurs between positive metal ions and negative non metal ions
Three properties of ionic compounds
- Giant ionic lattice structure
- High melting and boiling points
- Conduct electricity only when molten or dissolved
What is covalent bonding
A shared pair of electrons between two non metal atoms. Covalent bonding happens in non metal compounds and in non metal elements
Limitation of dot and cross diagram
Don’t show relative sizes of atoms
Don’t show arrangement in space
Limitations of ball and stick diagram
Don’t show which atoms the electrons in the bonds come from
Limitations of displayed formula
Doesn’t show 3D structure
Two properties of simple molecular substances
Low melting and boiling points
Don’t conduct electricity
What are polymers?
Very long chains of repeating units
What state are polymers at room temperature
Usually solid - have relatively strong intermolecular forces
What are giant covalent structures?
Solids containing atoms which are all bonded to each other by string covalent bonds
Properties of giant covalent structures
High melting and boiling points
Don’t conduct electricity
Bonding, properties, melting point and conductivity of diamond …
C atoms form FOUR covalent bonds
Very hard
High melting point
Doesn’t conduct electricity
Bonding, properties, melting point and conductivity of graphite…
C atoms form THREE covalent bonds
Soft, slippery
High melting point
Conducts electricity
Bonding, properties, melting point and conductivity of graphene…
C atoms form THREE covalent bonds
Strong, light
High melting point
Conducts electricity
