C3.5/6 - Covalent bonding + simple molecules Flashcards
1
Q
covalent bond meaning
A
-occurs between two atoms that share a pair/more pairs of electrons
2
Q
Why does covalent bonds happen?
A
- as nonmetals can only gain electrons
- to complete their outer shell thy must share a pair of electrons
3
Q
Giant covalent structures
A
- consists of small molecules/atoms
- held together by a network of covalent bonds
4
Q
Inter molecular forces
A
- forces of attraction
- between covalently bonded molecules in simple molecular substances
- weak forces
- not a lot of energy is needed to break them
- forces increase with the size of the molecule
5
Q
Large molecules have ..
A
higher melting/boiling points
6
Q
polymers
A
- made up from many small reactive molecules
- bonded to each other
- form long chains
7
Q
why can’t compounds from simple molecules not be conductors
A
- they have no overall charge
- so they can’t carry electrical charge
8
Q
simple molecule
A
contains a few atoms that are held together by covalent bonds
