1.3 Structures

Question 1

Properties of Ionic compounds

Answer 1

High melting and boling points and solid at room temp
- Substantial energy required to break strong ionic bonds

Conduct electricity when Molten
- The ions move and carry charge

Cannot conduct electricity when solid
- The ions cannot move and carry charge

Question 1

What is Giant Ionic lattice

Answer 1

Ionic compounds have a structure described as giont ionic lattice

Question 2

What are molecular covalent bonds

Answer 2

Strong bonds between atoms in the molecule but wee forces of attraction between the molecules (van der waals)

Question 3

Properties of Molecular covalent substances

Answer 3

Low melting and boiling points
- Little energy needed to break the weak van der waals

Do not conduct electricity
- No charged particles to move and carry charge

Question 4

Properties of Diamond

Answer 4

Very high melting and boiling point
(3000C)

Does NOT conduct electricity
- No delocalised electrons to move and carry charge

Hard - Strong covalent bonds

Question 5

What is Graphite

Answer 5

Structure of Graphite - Hexagonal arrangement of carbon atoms

Question 6

Properties of Graphite

Answer 6

High melting and boiling point (3000C)

Conducts electricity - Delocalised electrons can move and carry charge

Soft/Slippery - Weak van der waals

Question 7

Structure of Graphene

Answer 7

Single atom thick layer of graphite with strong covalent bonds between each carbon atom

Question 8

Properties of graphene

Answer 8

Very strong : Strong covalent bonds between atoms

Conducts electricity: Delocalised electrons which can move and carry charge

Question 9

Uses of diamond, graphite and graphene

Answer 9

Diamond - Drill tips as it is hard
Graphene - Batteries and solar cells as it is strong
Graphite - Lubricant in pencils

Question 10

Metallic structure

Answer 10

Positive ions and negative delocalised electrons

Question 11

Properties of Metals

Answer 11

High melting and are solids at room temperature ( EXCEPT Mercury)
- Substantial energy required to break strong metallic bonds.

Conduct electricity
- The delocalised electrons can move and carry charge

Malleable (can be hammered into shape)
Ductile - Can be drawn into wire
- Layers of ions can slide over eachother without disrupting bonding

Question 12

What is an Alloy

Answer 12

A mixture of two or more elements at least one of which is a metal, and the resulting mixture has metallic properties