C3.5/6 - Covalent bonding + simple molecules

Question 1

covalent bond meaning

Answer 1

-occurs between two atoms that share a pair/more pairs of electrons

Question 2

Why does covalent bonds happen?

Answer 2

• as nonmetals can only gain electrons

- to complete their outer shell thy must share a pair of electrons

Question 3

Giant covalent structures

Answer 3

• consists of small molecules/atoms

- held together by a network of covalent bonds

Question 4

Inter molecular forces

Answer 4

• 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

Question 5

Large molecules have ..

Answer 5

higher melting/boiling points

Question 6

polymers

Answer 6

• made up from many small reactive molecules
• bonded to each other
• form long chains

Question 7

why can’t compounds from simple molecules not be conductors

Answer 7

• they have no overall charge

- so they can’t carry electrical charge

Question 8

simple molecule

Answer 8

contains a few atoms that are held together by covalent bonds