C2 Flashcards
Structure and Bonding
what is ionic bonding?
the transferring of electrons between non- metals and metals so that all atoms have a full outer shell
what is covalent bonding?
the sharing of electrons between non-metals
what is metallic bonding?
the sharing of delocalised electrons between metallic elements and alloys
name 3 properties of ionic compounds
-High melting and boiling points
-do not conduct electricity when solid
- do not conduct electricity when molten or dissolved
- large amounts of energy needed to break the bonds
- ions are held in a fixed position in the lattice and cannot move
- Lattice breaks apart and the ions are free to move
describe the structure of ionic compounds
- held together by strong electrostatic forces of attraction between oppositely charged ions
- forces act in all directions in the lattice
are metals good conductors of electricity?
Yes
are metals good conductors of thermal energy?
Yes
complete the sentence:
___________ electrons carry electrical charge through the metal
Delocalised
complete the sentence:
energy is __________ by the delocalised electrons in metals
transferred
what is an alloy?
Mixture of two or more elements at lease one of which is a metal
why are alloys harder than pure metal?
the atoms of different sizes disrupt the layers so they cannot slide over each other
what are 3 properties of a diamond?
- very hard
-very high melting point - does not conduct electricity
- rigid structure
- strong covalent bonds
- no delocalised electrons
complete the sentence:
atoms in a polymer are linked by strong __________ bonds
covalent
name 3 properties of Graphite?
- slippery
- very high melting point
- doesn’t conduct electricity
- layers can slide over each other
- delocalised electrons between layers
- strong covalent bonds
True of False?
Graphene is a single layer of graphite
True
