ALL OF PAPER 1 Flashcards
why are noble gases unreactive?
they have a full outer shell - group 8
Describe group 7 halogens
- non metals
- diatomic
- highly reactive, most reactive at the top
- react very violently with group 1 metals
How do you know if an element will displace another element in a compound?
More reactive elements displace less reactive elements
Properties of an ionic compound
- Giant ionic lattice
- high melting point
- high boiling point
- only conducts when molten or dissolved
What is covalent bonding?
sharing of electrons between 2 non metals
what type of covalent bonds do diatomic oxygen and nitrogen molecules have
oxygen = double bond so 4 electrons in the middle nitrogen = triple bond so 6 in the middle
Properties of small covalent structures
- low boiling and melting point
- usually can’t conduct
properties of giant covalent molecules?
- giant covalent strucure
- high melting and boiling points
- dont conduct
- dont dissolve
properties of diamond?
- giant covalent
- made of carbon atoms bonded to 4 others
- very hard and strong
properties of graphite?
- giant covalent structure
- made of carbon atoms bonded to 3 others
- soft
- conducts electricity
what is graphene?
a single sheet of graphite, one atom thick
What are the 2 fullerenes?
- buckminster fullerene
- carbon nanotubes
what can buckminster fullerene be used for?
- lubricant
- reinforcement
- drug delivery
What are metals made up of?
posotive ions in a sea of delocalised electrons
What is an alloy
a metal that has something else added to it , e.g. steel
