Covalent Bonding

Question 1

explain the covalent molecule

Answer 1

sharing of electrons in small molecules of discrete separate units

Question 2

what are the 3 properties of covalent molecules

Answer 2

low melting point
non conductors
soft not hard

Question 3

explain why covalent molecules have low melt points

Answer 3

each molecule is a discrete unit and not bonded to any other molecule so little energy required to break covalent bonds

Question 4

explain why covalent molecules are non conductors

Answer 4

molecules have no charge because electrons are shared not transferred

Question 5

explain why covalent molecules are soft

Answer 5

one molecule is not bonded rigidly to other and only held by IMF -> easy to separate

Question 6

what is an example of covalent molecule

Answer 6

CO2, F2,

Question 7

what is covalent bonding

Answer 7

occurs when electrons are shared equally between non metals to fill valence shell

Question 8

explain colvalent networks

Answer 8

non metals sharing electrons with like or different atoms in a huge network structure held together by covalent bonds

Question 9

what are the 3 properties of covalent networks

Answer 9

very high melt point
non conductors of electricty
hard

Question 10

explain the conductivity of covalent network

Answer 10

there are no delocalised electrons to transfer bond and no charges to attract them

Question 11

explain the high melting point of covlanet networks

Answer 11

electrostatic attraction of the covalent bonds requires lots of thermal energy to break the atom array

Question 12

explain the hardness of covalent network

Answer 12

all atoms are linked in a network array and it is hard to move one atoms away from another by force

Question 13

what is an example of a covalent network

Answer 13

diamond, graphite