C2 - Bonding, Structures, Properties of matter

Question 1

Name the three types of bonding and define them

Answer 1

Ionic - transfer of electrons from the metal to the non-metal
Covalent - the sharing of electrons between nonmetals
Metallic - strong electrostatic force of attraction between the metal ions and the delocalised electrons

Question 2

What kind of melting and boiling points do ionic compounds have

Answer 2

High

Question 3

When can ionic compound conduct electricity and when can’t they conduct electricity

Answer 3

When molten or dissolved

Question 4

What are alloys

Answer 4

Mixture of two or more elements at least one of which is a metal

Question 5

What is covalent bonding

Answer 5

Sharing of electrons between non metals

Question 6

What are polymers

Answer 6

Lots of small units joined to form a molecule, held by strong covalent bonds

Question 7

What kind of forces do polymers have

Answer 7

Intermolecular forces are weak

Question 8

Giant covalent structure:
How are atoms bonded together in a giant covalent structure
Give examples
What bonds do they have
What kind of melting and boiling point do they have

Answer 8

All the atoms are bonded using strong covalent bonds
Diamond, graphite
Intermolecular bonds are strong
High melting and boiling point

Question 9

Simple molecular substances:
What kind of bonds and forces do they have
What states are they in
Can they conduct electricity

Answer 9

Covalent bonds in the molecule are strong but intermolecular forces are weak
Usually gases or liquids with low melting and boiling points
Do not conduct electricity

Question 10

Explain why graphite is a good conductor of electricity and is soft and slippery

Answer 10

no bonds between layers
* so the layers can slide over each other
* so graphite is soft and slippery