C2:Chemical bonds, ionic, covalent and metallic Flashcards
what happens in metallic bonding
grid off ions surrounded by a sea of delocalised electrons as the electrons can move the can bond with each other
what are ionic compound
giant structure of ions
what are ionic compound held together by
strong electrostatic attraction held together by oppositely charged ions
what are the limitations of using dot and cross, ball and stick, two and three-dimensional diagrams to represent a giant
ionic structure
gives no information about the forces of attraction between the ions,or the
movement of the electrons,
what do the ions have to do in an ionic compound
the charges on an ion have to cancel each other out to leave an overall charge of 0
what is the structure of ionic compounds
giant ionic lattice
why do ionic compounds have high melting and boiling points
need a lot of energy to break the strong bonds
how can ionic compounds conduct electricty
when they are molten or dissolved in an aqueous solution
why can they conduct electricity
ions are free to move so thye can carry a charge
Mg^2+ no3^-
what is this in an ionic compound
Mg(NO)3
what can covalent bonds consist of
small molecules
what are polymers an example of
large molecules
what do metallic bonds consist of
atoms arranged in a regular pattern
what happens during metallic bonding
electrons become delocalised and are free to move around.The sharing of delocalised electrons allow for strong metallic bonds
the amount of energy needed to change from a state of matter depends on
the strength of the forces acting on the particles of the substance
what does the nature of the particles depend on
type of bonding and structure of the substance
what are the limitations of the simple state model
there are no forces, all particles are represented as spheres and that they are solid
gasses don’t keep a definite …. whereas solids and liquids do
shape or volume
what are the forces between molecules called
intermolecular forces
in simple molecular substances what is broken
intermolecular forces
more molecules means
more intermolecular forces which gives a stronger attraction
why cant simple molecular substances conduct
no free electrons and the molecules have no charge
polymers have
large molecules and strong covalent bonds
polymers are what at room temperature
solids
