Chapter 5 - Covalent Network Substances

Question 0

Are Covalent Network Substances good conductors of electricity?

Answer 0

Nope, because their electrons are localized.

Question 1

What is a Covalent Network Substance❓

Answer 1

A covalent network substance is an infinite structure, in which every atom is bonded together with every other surrounding atom by strong covalent bonds.

Question 2

Why are Covalent Network Substances solids extremely hard and brittle?

Answer 2

They have very strong bonds and a rigid lattice.

Question 3

Why do covalent network substances have very high melting and boiling points?

Answer 3

They have very strong bonds.

Question 4

Chemically inert?

Answer 4

They have localized electrons therefore it is hard to move/react.

Question 5

Why are Covalent Network Substances insoluble in water?

Answer 5

They have no charged particles and very strong bonds.

Question 6

Why do Graphite conduct electricity?

Answer 6

Graphite is SOFT and a good conductor of electricity because it’s 4th electron is delocalised and free to move in between the layers of carbon atoms and are able to conduct electricity.

Question 7

Different particle size❓

Answer 7

Filtration

Question 8

Different solubilities in a selected liquid

Answer 8

Crystallization

Question 9

Purification of liquids

Answer 9

Distillation❄️ most effective for components in a mixture which have very different boiling points.