Covalent Substances (2 Kinds)

Question 1

What is a Simple Molecular Substance?

Answer 1

Atoms form very strong COVALENT bonds to form SMALL molecules of several atoms.

Question 2

What are the properties of a Simple Molecular Substance?

Answer 2

Forces of attraction between the molecules are very weak.

Question 3

Forces of attraction cause the Simple Molecular Substance cause …

Answer 3

The melting and boiling points to be VERY LOW, because the monecules are easily parted from eachother.

Question 4

The Intermolecular forces are … when Simple Molecular substances …
Most Simple Molecular Substances are .. (their state)

Answer 4

BROKEN
MELT OR BOIL
Gases or Liquids at room temperature, but they can be solids.

Question 5

Examples of Simple Molecular Substances:-

Hydrogen, Ammonia, Methane and Water have…

Answer 5

Very STRONG bonds between the atoms.
But Very WEAK intermolecular forces.
When they are broken when melt or boil as WEAK INTERMOLECULAR FORCES BREAK.

Question 6

Simple Molecular Substances .. (electricity)

Answer 6

Dont conduct electricity- There are no ions so there’s NO ELECTRICAL CHARGE

Question 7

Giant Covalent Structures are..

Answer 7

MACROMOLECULES

Question 8

What are Giant Covalent Structures?

Answer 8

All of the atoms are bonded to eachother by STRONG COVALENT BONDS.

Question 9

What are the properties of Giant Covalent Structures?

Answer 9

Due to strong covalent bonds, They have VERY HIGH melting and boiling points.

Question 10

Giant Covalent Structures … (electricity)

Answer 10

Dont conduct electricity - not even when molten (EXCEPT GRAPHITE)

Question 11

Examples of Giant Covalent Structures:- Diamond

Answer 11

> Each CARBON atom forms FOUR covalent bonds in a VERY RIGID giant covalent structure.
This makes diamond the HARDEST natural substance.
It is used in Drill Tips.

Question 12

Examples of Giant Covalent Structures:- Silcone Dioxide (Sillca)

Answer 12

> It is what SAND is made of.

>Each grain of sand is the giant structure of SILCONE and OXYGEN.

Question 13

Examples of Giant Covalent Structures:- Graphite

Answer 13

> Layers which are free to SLIDE OVER EACHOTHER, so graphite is soft and slippery.
Layers are held together LOOSELY so that they can be RUBBED OFF onto paper.
This is due to WEAK INTERMOLECULE FORCES between layers.
Graphite is NON-Metal which is a GOOD CONDUCTOR OF HEAT AND ELECTRICITY, as it has DELOCALISED ELECTRONS.