Covalent bonding

Question 1

Explain what it is?

Answer 1

strong bond thats forms when pair of electrons is shared between 2 atoms

Question 2

Properties of covalent bonds

Answer 2

force of attraction between molecules=weak
melting/boiling point low
gases or liquid at room temp
dont conduct electricity -no free electrons/ions

Question 3

Properties of big covalent bonds

Answer 3

strong c bonds
high melting/boiling point
dont conduct electricity
arent soluble in water

Question 4

Name 3 giant covalent structures and uses

Answer 4

Diamond-cutting tools
Graphene-strong wont break easily lightweight wont + to weight…
Graphite-lubricant/electrodes
Buckministerfullrene-tube of c atoms

Question 5

What does allotrope mean?

Answer 5

Different form of carbon e.g diamond

Question 6

How is graphite and diamond structure related to its use?

Answer 6

G 1 dlectron free delocalised electricity

D-rigid lattice structure

Question 7

What does covalent bond result in?

Describe a polyethene molecule

Answer 7

Molecule

Large m with lots c atoms

Question 8

Some carbons have lower melting boiling points bc ….

Answer 8

Weak intermolecular forces

Change state but dont break apart

Question 9

In giant covalent structures explain why when they are heated they change state but dont break apart ?
As the number of carbons in the molecule increases in a hydrocarbon what happens to its melting/boiling point and why?

Answer 9

bonds between the atoms r weak intermolecular bonds

high melting/boiling point bc larger m and bigger the attraction so more energy needed to break it